SMD code search: identify a part by its marking

Not sure which one you have?

Answer up to 4 quick questions and these 33 parts are ranked, with a meter test that settles it. It works on a dead part too.

Nothing is printed exactly F-R

These parts are printed with a character that is easy to misread as what you typed. The odd one out is marked on each.

AX6607-30Z6printed FrDFNLDO regulator, AXElite TechnologyLDO regulatorAXElite Technology
Printed Fr on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
What it is
LDO regulator
Maker
AXElite Technology
Package
DFN
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, 3.0V±2%, 600mA, +CE
Source
Published code list
Is it dead?
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
R3114K221Cprinted FRDFNVoltage supervisor, RicohVoltage supervisorRicoh
Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
Ricoh
Package
DFN
Pins
Not recorded
Details
Voltage detector IC: 2.2V±0.8%, -Reset PPO
Source
Published code list
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.
R3134K24ECprinted FRDFNVoltage supervisor, RicohVoltage supervisorRicoh
Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
What it is
Voltage supervisor
Maker
Ricoh
Package
DFN
Pins
Not recorded
Details
Voltage detector IC: 2.4V±1.8%, -Reset PPO, -MR
Source
Published code list
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.
30 more parts have no package on record. Nothing rules them out, so they stay.
- L2SA1774RT1Gprinted FRPNP transistor, LRCPNP transistorLRC
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  PNP transistor
  Maker
  LRC
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Bipolar transistor, PNP, IC 150 mA, VCEO 50 V
  Source
  Manufacturer datasheet
  Is it dead?
  Diode range, part lifted or its base leg off the pad.
  Working, it reads
  Black probe on the base 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
  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 L2SA1774RT1G, opens in a new tab
- MM5Z3V0Bprinted FRZener diode, Formosa MicrosemiZener diodeFormosa Microsemi
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Zener diode
  Maker
  Formosa Microsemi
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Manufacturer 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
  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 MM5Z3V0B, opens in a new tab
- MM5Z3V0B-Q1printed FRZener diode, Formosa MicrosemiZener diodeFormosa Microsemi
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Zener diode
  Maker
  Formosa Microsemi
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Manufacturer 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
  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 MM5Z3V0B-Q1, opens in a new tab
- S-L2SA1774RT1Gprinted FRPNP transistor, LRCPNP transistorLRC
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  PNP transistor
  Maker
  LRC
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Bipolar transistor, PNP, IC 150 mA, VCEO 50 V
  Source
  Manufacturer datasheet
  Is it dead?
  Diode range, part lifted or its base leg off the pad.
  Working, it reads
  Black probe on the base 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
  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 S-L2SA1774RT1G, opens in a new tab
- 2SA1576UBprinted FRPNP transistorPNP transistorNot recorded
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  PNP transistor
  Maker
  Not recorded
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Published code list
  Is it dead?
  Diode range, part lifted or its base leg off the pad.
  Working, it reads
  Black probe on the base 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
  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.
- 2SA1577Qprinted FRNot recordedNot recorded
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Not recorded
  Maker
  Not recorded
  Package
  Not recorded
  Pins
  Not recorded
  Details
  see 2SA1037K above
  Source
  Published code list
  Is it dead?
  Diode range and ohms range, part lifted.
  Working, it reads
  Depends on what it is. The datasheet, or an identical part, says.
  Dead, it reads
  Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
  Open between every pair of pins: failed open, or a part that reads open when working.
  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.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- 2SA1774EBprinted FRPNP transistor, ROHMPNP transistorROHM
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  PNP transistor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Source
  Published code list
  Is it dead?
  Diode range, part lifted or its base leg off the pad.
  Working, it reads
  Black probe on the base 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
  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.
- 2SA1774EBRprinted FRROHMNot recordedROHM
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Not recorded
  Maker
  ROHM
  Package
  Not recorded
  Pins
  3
  Details
  equivalent 2SA933ASR
  Source
  Published code list
  Is it dead?
  Diode range and ohms range, part lifted.
  Working, it reads
  Depends on what it is. The datasheet, or an identical part, says.
  Dead, it reads
  Between two pins, the same reading both ways, near 0 V with a continuous beep: shorted.
  Open between every pair of pins: failed open, or a part that reads open when working.
  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.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- BD48L29Gprinted FrVoltage supervisor, ROHMVoltage supervisorROHM
  Printed Fr on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage Detector
  Source
  Published code list
  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.
- BD4935FVEprinted FRVoltage supervisor, ROHMVoltage supervisorROHM
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 3,5V, Reset Push-pull output
  Source
  Published code list
  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.
- BD4935Gprinted FRVoltage supervisor, ROHMVoltage supervisorROHM
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  CMOS-IC: Voltage Detector 3,5V, Reset Push-pull output
  Source
  Published code list
  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.
- BU46K474Gprinted fRVoltage supervisor, ROHMVoltage supervisorROHM
  Printed fR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  ROHM
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.7V±1%, -Reset PPO, Rdt=400ms
  Source
  Published code list
  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.
- FP6121-OVSPprinted FRLDO regulator, FitipowerLDO regulatorFitipower
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  LDO regulator
  Maker
  Fitipower
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.8V/1.8V±2%, 150mA, +CE
  Source
  Published code list
  Is it dead?
  Voltage, board powered, black probe on ground. Then ohms with the power off.
  Working, it reads
  Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
  Dead, it reads
  Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  Power off, input to output near 0 Ω: shorted.
  On the board:
  An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
  Compare:
  The same regulator on another rail or another board shows the right voltages and the right resistances.
  Watch for:
  Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- IXD5127C40ANRprinted FRVoltage supervisor, IXYSVoltage supervisorIXYS
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.0V±0.8%, -Reset PPO, -MR, 50ms Rt delay
  Source
  Published code list
  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.
- IXD5127N40FNRprinted FRVoltage supervisor, IXYSVoltage supervisorIXYS
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  IXYS
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.0V±0.8%, +Reset ODO, -MR, 50ms Rt delay
  Source
  Published code list
  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.
- L2SA1774RT1printed FRPNP transistor, LRCPNP transistorLRC
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  PNP transistor
  Maker
  LRC
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Si-pnp: GP, 60V, 150mA, 150mW, B=180..390, 140MHz
  Source
  Published code list
  Is it dead?
  Diode range, part lifted or its base leg off the pad.
  Working, it reads
  Black probe on the base 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
  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.
- PAM8404ZEprinted FRPower Analog MicroelectronicsNot recordedPower Analog Microelectronics
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Not recorded
  Maker
  Power Analog Microelectronics
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear IC: APA, BTL, class-D, 2.5..5.5V, 2x3W(5V/4), shutdown
  Source
  Published code list
  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.
- RP300K28BAprinted FRVoltage supervisor, RicohVoltage supervisorRicoh
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  Ricoh
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 2.8V±1%, +Reset ODO, -MR, Rdt=100ms
  Source
  Published code list
  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.
- XC6127C40ANRprinted FRVoltage supervisor, TorexVoltage supervisorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.0V±0.8%, -Reset PPO, -MR, Rdt=50ms
  Source
  Published code list
  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.
- XC6127N40FNRprinted FRVoltage supervisor, TorexVoltage supervisorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.0V±0.8%, +Reset ODO, -MR, Rdt=50ms
  Source
  Published code list
  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.
- XC6129C40C9R-Gprinted FRVoltage supervisor, TorexVoltage supervisorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.0V±0.8%, -Reset PPO, Detect Delay
  Source
  Published code list
  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.
- XC6129C40CNR-Gprinted FRVoltage supervisor, TorexVoltage supervisorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.0V±0.8%, -Reset PPO, Detect Delay
  Source
  Published code list
  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.
- XC6129N40D9R-Gprinted FRVoltage supervisor, TorexVoltage supervisorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.0V±0.8%, -Reset ODO, Det. Delay, Undef. Protect
  Source
  Published code list
  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.
- XC6129N40DNR-Gprinted FRVoltage supervisor, TorexVoltage supervisorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  Voltage supervisor
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Voltage detector IC: 4.0V±0.8%, -Reset ODO, Det. Delay, Undef. Protect
  Source
  Published code list
  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.
- XC6223E381NR-Gprinted FRLDO regulator, TorexLDO regulatorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 3.8V±1%, 300mA, +CE, ICP
  Source
  Published code list
  Is it dead?
  Voltage, board powered, black probe on ground. Then ohms with the power off.
  Working, it reads
  Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
  Dead, it reads
  Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  Power off, input to output near 0 Ω: shorted.
  On the board:
  An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
  Compare:
  The same regulator on another rail or another board shows the right voltages and the right resistances.
  Watch for:
  Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XC6223H32B9R-Gprinted FRLDO regulator, TorexLDO regulatorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 3.25V±1%, 300mA, +CE, CL, PDR, ICP
  Source
  Published code list
  Is it dead?
  Voltage, board powered, black probe on ground. Then ohms with the power off.
  Working, it reads
  Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
  Dead, it reads
  Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  Power off, input to output near 0 Ω: shorted.
  On the board:
  An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
  Compare:
  The same regulator on another rail or another board shows the right voltages and the right resistances.
  Watch for:
  Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XC6237A381NR-Gprinted FRLDO regulator, TorexLDO regulatorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 3.8V±1%, 150mA, +CE, CL
  Source
  Published code list
  Is it dead?
  Voltage, board powered, black probe on ground. Then ohms with the power off.
  Working, it reads
  Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
  Dead, it reads
  Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  Power off, input to output near 0 Ω: shorted.
  On the board:
  An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
  Compare:
  The same regulator on another rail or another board shows the right voltages and the right resistances.
  Watch for:
  Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XC6237A3819R-Gprinted FRLDO regulator, TorexLDO regulatorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 3.8V±1%, 150mA, +CE, CL
  Source
  Published code list
  Is it dead?
  Voltage, board powered, black probe on ground. Then ohms with the power off.
  Working, it reads
  Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
  Dead, it reads
  Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  Power off, input to output near 0 Ω: shorted.
  On the board:
  An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
  Compare:
  The same regulator on another rail or another board shows the right voltages and the right resistances.
  Watch for:
  Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XC6241B2819R-Gprinted FRLDO regulator, TorexLDO regulatorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 2.8V±1%, 150mA, +CE
  Source
  Published code list
  Is it dead?
  Voltage, board powered, black probe on ground. Then ohms with the power off.
  Working, it reads
  Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
  Dead, it reads
  Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  Power off, input to output near 0 Ω: shorted.
  On the board:
  An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
  Compare:
  The same regulator on another rail or another board shows the right voltages and the right resistances.
  Watch for:
  Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
- XC6501B381NR-Gprinted FRLDO regulator, TorexLDO regulatorTorex
  Printed FR on the part. Easy to misread as F-R. Check that character with a loupe before you order anything.
  What it is
  LDO regulator
  Maker
  Torex
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Linear voltage regulator IC: LDO, 3.8V±1%, 200mA, +CE, CL
  Source
  Published code list
  Is it dead?
  Voltage, board powered, black probe on ground. Then ohms with the power off.
  Working, it reads
  Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
  Dead, it reads
  Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  Power off, input to output near 0 Ω: shorted.
  On the board:
  An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
  Compare:
  The same regulator on another rail or another board shows the right voltages and the right resistances.
  Watch for:
  Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
  A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

62 more parts have codes that begin with F-R: none in DFN, 62 with no package on record

Codes that begin with F-R

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

17 parts have no package on record. Nothing rules them out, so they stay.

G9293FRA31Uprinted FR3LDO regulator, Global Mixed-mode TechnologyLDO regulatorGlobal Mixed-mode Technology
Printed FR3. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
LDO regulator
Maker
Global Mixed-mode Technology
Package
Not recorded
Pins
Not recorded
Details
Linear voltage regulator IC: LDO, Dual out., Vout1/Vout2=1.5V/3.3V±2%, 300mA, +CE
Source
Published code list
Is it dead?
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
IRFR1205PBFprinted FR1205N-channel MOSFET, International RectifierN-channel MOSFETInternational Rectifier
Printed FR1205. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
N-channel MOSFET
Maker
International Rectifier
Package
Not recorded
Pins
Not recorded
Source
Published code list
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
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.
IXD5127C39A7Rprinted FRAVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRA. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, -Reset PPO, -MR, Rdt=50ms
Source
Published code list
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.
IXD5127C39B7Rprinted FRBVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRB. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, -Reset PPO, -MR, Rdt=100ms
Source
Published code list
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.
IXD5127C39C7Rprinted FRCVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRC. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, -Reset PPO, -MR, Rdt=200ms
Source
Published code list
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.
IXD5127C39D7Rprinted FRDVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRD. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, -Reset PPO, -MR, Rdt=400ms
Source
Published code list
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.
IXD5127C39E7Rprinted FREVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRE. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, -Reset PPO, -MR, Rdt=800ms
Source
Published code list
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.
IXD5127C39F7Rprinted FRFVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRF. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, +Reset PPO, -MR, Rdt=50ms
Source
Published code list
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.
IXD5127C39G7Rprinted FRHVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRH. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, +Reset PPO, -MR, Rdt=100ms
Source
Published code list
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.
IXD5127C39H7Rprinted FRKVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRK. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, +Reset PPO, -MR, Rdt=200ms
Source
Published code list
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.
IXD5127C39J7Rprinted FRLVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRL. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, +Reset PPO, -MR, Rdt=400ms
Source
Published code list
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.
IXD5127C39K7Rprinted FRMVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRM. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 3.9V±0.8%, +Reset PPO, -MR, Rdt=800ms
Source
Published code list
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.
IXD5127C40A7Rprinted FRNVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRN. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 4.0V±0.8%, -Reset PPO, -MR, Rdt=50ms
Source
Published code list
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.
IXD5127C40B7Rprinted FRPVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRP. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 4.0V±0.8%, -Reset PPO, -MR, Rdt=100ms
Source
Published code list
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.
IXD5127C40C7Rprinted FRRVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRR. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 4.0V±0.8%, -Reset PPO, -MR, Rdt=200ms
Source
Published code list
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.
IXD5127C40D7Rprinted FRSVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRS. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 4.0V±0.8%, -Reset PPO, -MR, Rdt=400ms
Source
Published code list
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.
IXD5127C40E7Rprinted FRTVoltage supervisor, IXYSVoltage supervisorIXYS
Printed FRT. Only the start matches what you typed, so this fits only if the rest of the marking is worn off.
What it is
Voltage supervisor
Maker
IXYS
Package
Not recorded
Pins
Not recorded
Details
Voltage detector IC: 4.0V±0.8%, -Reset PPO, -MR, Rdt=800ms
Source
Published code list
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.

45 more parts are not listed here. Type more of the code to narrow the list.

Did you find your part?

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.

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SMD code search: identify a part by its marking

What’s printed on it?

Nothing is printed exactly F-R

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Codes that begin with F-R

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One code, several parts

When more than one is left

When you cannot read it

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