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0.6 Ω resistor. 2 parts are printed R6. 6 printed with a similar-looking code.

R6 on a chip resistor

0.6 Ω

0.6 Ω resistor

The R stands in for the decimal point, which is how sub-ohm and fractional values are printed. The same marking also reads as 0.6 µH on an inductor or 0.6 pF on a capacitor, and nothing in the code says which; the body of the part does.

The same characters on another part

  • 0.6 µH inductor
  • 0.6 pF capacitor

Check it with a meter

Lift one end and measure across it. A good one reads 0.6 Ω. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 0.6 Ω on the board is a fault. Open, or well above 0.6 Ω, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 0.6 Ω. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.

On a transistor or diode body (SOT-23-5, SOT-23, SOD-123W), R6 is a part code instead. Those parts are listed below.

2 parts are printed R6

Not sure which one you have?

Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.

all SOT-23, 3 pins. What differs:

  • BZX84-B6V8SOT-23Zener diode, Nexperia
    What it is
    Zener diode
    Maker
    Nexperia
    Package
    SOT-23
    Pins
    3
    Details
    6.8 V ±2% voltage regulator (Zener) diode
    Source
    From the manufacturer's datasheet

    Is it dead?

    Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.

    Working, it reads

    About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.

    Dead, it reads

    • The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
    • Open both ways, forward too: failed open.
    • Holds well off its rated voltage on the supply test: drifted.
    • A soft knee, or a voltage that creeps on the supply test: leaky.
    On the board:
    On the board this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
    Compare:
    If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
    Watch for:
    A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor BZX84-B6V8, opens in a new tab
  • CJ3406SOT-23N-channel MOSFET, JSCJ
    What it is
    N-channel MOSFET
    Maker
    JSCJ
    Package
    SOT-23
    Pins
    3
    Details
    MOSFET, N-channel, 30 V, 3.6 A
    Source
    From the manufacturer's datasheet

    Is it dead?

    Diode range, part lifted. Test drain to source first, then short gate to source and test again.

    Working, it reads

    Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.

    Dead, it reads

    • Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
    • The gate reads low to source or drain: gate shorted. Often all three pins end up shorted together.
    • No body diode at all: failed open.
    On the board:
    On the board the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. Lift a leg to be sure.
    Compare:
    If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
    Watch for:
    The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor CJ3406, opens in a new tab
6 more parts are printed with a code easy to misread as R6

Printed with a code easy to misread

One character differs, and it is one that is easy to confuse under a lamp. The odd one out is marked on each.

  • PZS1136BESprinted RCSOD-523Zener diode, 2 pins, Panjit

    Printed RC on the part. Easy to misread as R6. Check that character with a loupe before you order anything.

    What it is
    Zener diode
    Maker
    Panjit
    Package
    SOD-523
    Pins
    2
    Source
    From the manufacturer's datasheet

    Is it dead?

    Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.

    Working, it reads

    About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.

    Dead, it reads

    • The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
    • Open both ways, forward too: failed open.
    • Holds well off its rated voltage on the supply test: drifted.
    • A soft knee, or a voltage that creeps on the supply test: leaky.
    On the board:
    On the board this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
    Compare:
    If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
    Watch for:
    A meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor PZS1136BES, opens in a new tab
  • SMAJ58Aprinted RGSMATVS diode, 2 pins, Vishay

    Printed RG on the part. Easy to misread as R6. Check that character with a loupe before you order anything.

    What it is
    TVS diode
    Maker
    Vishay
    Package
    SMA
    Pins
    2
    Details
    400 W TVS diode, unidirectional
    Source
    From the manufacturer's datasheet

    Is it dead?

    Diode range, from the protected line to ground, part lifted if you can.

    Working, it reads

    A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.

    Dead, it reads

    • From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
    • A reading both ways on a one-way part: leaky.
    • A one-way part open both ways: failed open.
    On the board:
    On the board, a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
    Compare:
    The same part on the next line or connector pin is the healthy reading to compare with.
    Watch for:
    A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor SMAJ58A, opens in a new tab
  • 4 more parts have no package on record
    • BFP182printed RGRF transistor, Infineon

      Printed RG on the part. Easy to misread as R6. Check that character with a loupe before you order anything.

      What it is
      RF transistor
      Maker
      Infineon
      Package
      Not recorded
      Pins
      Not recorded
      Source
      From the manufacturer's datasheet

      Is it dead?

      Diode range, part lifted or its base leg off the pad.

      Working, it reads

      From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.

      Dead, it reads

      • Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
      • The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
      • Only one junction reads, or none: a junction has failed open. It then looks like a diode.
      • A reading the wrong way round, where it should be open: leaky.
      On the board:
      On the board this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
      Compare:
      If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
      Watch for:
      A pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.

      A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

      Datasheetfor BFP182, opens in a new tab
    • BFP193printed RCRF transistor, Infineon

      Printed RC on the part. Easy to misread as R6. Check that character with a loupe before you order anything.

      What it is
      RF transistor
      Maker
      Infineon
      Package
      Not recorded
      Pins
      Not recorded
      Source
      From the manufacturer's datasheet

      Is it dead?

      Diode range, part lifted or its base leg off the pad.

      Working, it reads

      From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.

      Dead, it reads

      • Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
      • The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
      • Only one junction reads, or none: a junction has failed open. It then looks like a diode.
      • A reading the wrong way round, where it should be open: leaky.
      On the board:
      On the board this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
      Compare:
      If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
      Watch for:
      A pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.

      A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

      Datasheetfor BFP193, opens in a new tab
    • BFR182printed RGRF transistor, Infineon

      Printed RG on the part. Easy to misread as R6. Check that character with a loupe before you order anything.

      What it is
      RF transistor
      Maker
      Infineon
      Package
      Not recorded
      Pins
      Not recorded
      Source
      From the manufacturer's datasheet

      Is it dead?

      Diode range, part lifted or its base leg off the pad.

      Working, it reads

      From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.

      Dead, it reads

      • Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
      • The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
      • Only one junction reads, or none: a junction has failed open. It then looks like a diode.
      • A reading the wrong way round, where it should be open: leaky.
      On the board:
      On the board this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
      Compare:
      If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
      Watch for:
      A pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.

      A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

      Datasheetfor BFR182, opens in a new tab
    • BFR193printed RCRF transistor, Infineon

      Printed RC on the part. Easy to misread as R6. Check that character with a loupe before you order anything.

      What it is
      RF transistor
      Maker
      Infineon
      Package
      Not recorded
      Pins
      Not recorded
      Source
      From the manufacturer's datasheet

      Is it dead?

      Diode range, part lifted or its base leg off the pad.

      Working, it reads

      From the base, one probe colour reads about 0.6 to 0.75 V to the emitter and to the collector, and open the other way round. Collector to emitter reads open both ways.

      Dead, it reads

      • Collector to emitter the same both ways, near 0 V with a continuous beep: shorted. The commonest failure.
      • The base the same both ways to another pin, near 0 V or a middling value: a shorted junction.
      • Only one junction reads, or none: a junction has failed open. It then looks like a diode.
      • A reading the wrong way round, where it should be open: leaky.
      On the board:
      On the board this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
      Compare:
      If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
      Watch for:
      A pair of diodes with a common pin reads just like a transistor, and some transistors carry a built-in diode or resistor. The datasheet says which.

      A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

      Datasheetfor BFR193, opens in a new tab
42 more parts have codes that begin with R6

Codes that begin with R6

For a marking with its end worn or burnt off. Each one shows its full printed code.

  • BAR64-05Wprinted R64SOT-323Switching diode, 3 pins, Vishay

    Printed R64. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Switching diode
    Maker
    Vishay
    Package
    SOT-323
    Pins
    3
    Details
    RF PIN Diodes - Dual, Common Cathode in SOT-323
    Source
    From the manufacturer's datasheet

    Is it dead?

    Diode range, part lifted or one leg off the pad. Red probe on the anode.

    Working, it reads

    About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.

    Dead, it reads

    • The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
    • Open both ways: failed open.
    • A reading the wrong way round as well: leaky.
    On the board:
    On the board this is a first look only: the meter reads every path between those pins, and a short can be a neighbour. Lift one leg before you condemn it.
    Compare:
    If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
    Watch for:
    A three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor BAR64-05W, opens in a new tab
  • LM4040QAIM3-2.5printed R6ASOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6A. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QAIM3-2.5, opens in a new tab
  • LM4040QAIM3X2.5printed R6ASOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6A. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QAIM3X2.5, opens in a new tab
  • LM4040QBIM3-2.5printed R6BSOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6B. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QBIM3-2.5, opens in a new tab
  • LM4040QBIM3X2.5printed R6BSOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6B. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QBIM3X2.5, opens in a new tab
  • LM4040QCIM3-2.5printed R6CSOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6C. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QCIM3-2.5, opens in a new tab
  • LM4040QCIM3X2.5printed R6CSOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6C. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QCIM3X2.5, opens in a new tab
  • LM4040QDIM3-2.5printed R6DSOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6D. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QDIM3-2.5, opens in a new tab
  • LM4040QDIM3X2.5printed R6DSOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6D. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QDIM3X2.5, opens in a new tab
  • LM4040QEIM3-2.5printed R6ESOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6E. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QEIM3-2.5, opens in a new tab
  • LM4040QEIM3X2.5printed R6ESOT-23Voltage reference, 3 pins, Texas Instruments

    Printed R6E. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23
    Pins
    3
    Details
    LM4040-N/-Q1 Precision Micropower Shunt Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4040QEIM3X2.5, opens in a new tab
  • LM4128AQ1MF1.8printed R6AASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6AA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MF1.8, opens in a new tab
  • LM4128AQ1MF2.0printed R6BASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6BA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MF2.0, opens in a new tab
  • LM4128AQ1MF2.5printed R6CASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6CA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MF2.5, opens in a new tab
  • LM4128AQ1MF3.0printed R6DASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6DA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MF3.0, opens in a new tab
  • LM4128AQ1MF3.3printed R6EASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6EA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MF3.3, opens in a new tab
  • LM4128AQ1MF4.1printed R6FASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6FA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MF4.1, opens in a new tab
  • LM4128AQ1MFX1.8printed R6AASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6AA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MFX1.8, opens in a new tab
  • LM4128AQ1MFX2.0printed R6BASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6BA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MFX2.0, opens in a new tab
  • LM4128AQ1MFX2.5printed R6CASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6CA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MFX2.5, opens in a new tab
  • LM4128AQ1MFX3.0printed R6DASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6DA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MFX3.0, opens in a new tab
  • LM4128AQ1MFX3.3printed R6EASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6EA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MFX3.3, opens in a new tab
  • LM4128AQ1MFX4.1printed R6FASOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6FA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128AQ1MFX4.1, opens in a new tab
  • LM4128BQ1MF1.8printed R6ABSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6AB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MF1.8, opens in a new tab
  • LM4128BQ1MF2.0printed R6BBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6BB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MF2.0, opens in a new tab
  • LM4128BQ1MF2.5printed R6CBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6CB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MF2.5, opens in a new tab
  • LM4128BQ1MF3.0printed R6DBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6DB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MF3.0, opens in a new tab
  • LM4128BQ1MF3.3printed R6EBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6EB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MF3.3, opens in a new tab
  • LM4128BQ1MF4.1printed R6FBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6FB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MF4.1, opens in a new tab
  • LM4128BQ1MFX1.8printed R6ABSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6AB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MFX1.8, opens in a new tab
  • LM4128BQ1MFX2.0printed R6BBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6BB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MFX2.0, opens in a new tab
  • LM4128BQ1MFX2.5printed R6CBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6CB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MFX2.5, opens in a new tab
  • LM4128BQ1MFX3.0printed R6DBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6DB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MFX3.0, opens in a new tab
  • LM4128BQ1MFX3.3printed R6EBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6EB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MFX3.3, opens in a new tab
  • LM4128BQ1MFX4.1printed R6FBSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6FB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128BQ1MFX4.1, opens in a new tab
  • LM4128CQ1MF1.8printed R6ACSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6AC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128CQ1MF1.8, opens in a new tab
  • LM4128CQ1MF2.0printed R6BCSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6BC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128CQ1MF2.0, opens in a new tab
  • LM4128CQ1MF2.5printed R6CCSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6CC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128CQ1MF2.5, opens in a new tab
  • LM4128CQ1MF3.0printed R6DCSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6DC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128CQ1MF3.0, opens in a new tab
  • LM4128CQ1MF3.3printed R6ECSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6EC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128CQ1MF3.3, opens in a new tab
  • LM4128CQ1MF4.1printed R6FCSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6FC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128CQ1MF4.1, opens in a new tab
  • LM4128CQ1MFX1.8printed R6ACSOT-23-5Voltage reference, 5 pins, Texas Instruments

    Printed R6AC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.

    What it is
    Voltage reference
    Maker
    Texas Instruments
    Package
    SOT-23-5
    Pins
    5
    Details
    LM4128/LM4128Q SOT-23 Precision Micropower Series Voltage Reference
    Source
    From the manufacturer's datasheet

    Is it dead?

    Voltage with the board powered; ohms from each pin to ground with it off.

    Working, it reads

    Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

    Dead, it reads

    • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
    • Supply present, output stuck: failed, or its load has.
    On the board:
    A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
    Compare:
    The surest reference is the same IC on a working board, measured pin by pin.
    Watch for:
    Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

    A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

    Datasheetfor LM4128CQ1MFX1.8, opens in a new tab

One code, several parts

Marking codes are not unique. In the standard code book, 6H on a SOT-23 is an NPN transistor, a varicap, an N-channel JFET, two digital transistors, a 3.6 V voltage detector: six parts from five makers. So a search shows the parts we hold under that code and under codes easily misread as it, with only the columns that tell them apart.

6Hon a SOT-23, in the code book
  • NPN transistor
  • Varicap
  • N-channel JFET
  • Digital transistor ×2
  • 3.6 V voltage detector

When more than one is left

Tap Help me choose. Up to 4 quick answers: whether the part has failed, then what separates the parts left. Those get ranked with the reasoning and a test that settles it. That uses one identification: 2 a month are free without an account, and 3 with a free account.

When you cannot read it

Tap the camera in the field. We read the characters, keep the ones we are unsure of, and search every reading. A photo too soft to read is turned back on your phone first; if it is the only one you can get, you can still send it.