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SMD code A19

Marking codes are not standardised, and the same code is reused by unrelated makers for unrelated parts. Below is every part in our tables printed with it, and any printed with a code that is easy to misread as it, from the manufacturers' own marking tables and published code lists.

20 parts are printed A19

Not sure which one you have?

Answer up to 4 quick questions and these 20 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • 2SK436-A19SOT-233 pins, onsemiNot recordedSOT-233 pinsonsemi
    What it is
    Not recorded
    Maker
    onsemi
    Package
    SOT-23
    Pins
    3
    Details
    n-FET: RF-AM, LN, 15V, 20mA, 150mW, Idss=2.5..4.2mA
    Source
    Published code list

    Is it dead? The meter test is below: MOSFET.

  • AAT60219A-S5SOT-23-5Voltage supervisor, 5 pins, Advanced Analog TechnologyVoltage supervisorSOT-23-55 pinsAdvanced Analog Technology
    What it is
    Voltage supervisor
    Maker
    Advanced Analog Technology
    Package
    SOT-23-5
    Pins
    5
    Details
    Voltage detector IC: 1.9V±2%, -Reset PPO
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • AAT60219A-S15SOT-343Voltage supervisor, 4 pins, Advanced Analog TechnologyVoltage supervisorSOT-3434 pinsAdvanced Analog Technology
    What it is
    Voltage supervisor
    Maker
    Advanced Analog Technology
    Package
    SOT-343
    Pins
    4
    Details
    Voltage detector IC: 1.9V±2%, -Reset PPO
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • CLC425AJM5SOT-23-55 pins, National SemiconductorNot recordedSOT-23-55 pinsNational Semiconductor
    What it is
    Not recorded
    Maker
    National Semiconductor
    Package
    SOT-23-5
    Pins
    5
    Details
    Op-IC: Ultra LN, WB
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • ELM9719NABSOT-89Voltage supervisor, 3 pins, ELM TechnologyVoltage supervisorSOT-893 pinsELM Technology
    What it is
    Voltage supervisor
    Maker
    ELM Technology
    Package
    SOT-89
    Pins
    3
    Details
    Voltage detector IC: 1.9V±2.5%, +Reset ODO
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • ELM9719NBBSOT-23Voltage supervisor, 3 pins, ELM TechnologyVoltage supervisorSOT-233 pinsELM Technology
    What it is
    Voltage supervisor
    Maker
    ELM Technology
    Package
    SOT-23
    Pins
    3
    Details
    Voltage detector IC: 1.9V±2.5%, +Reset ODO
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • KIC77A19TSOT-23Voltage supervisor, 3 pins, KECVoltage supervisorSOT-233 pinsKEC
    What it is
    Voltage supervisor
    Maker
    KEC
    Package
    SOT-23
    Pins
    3
    Details
    Voltage detector IC: 1.9V±1%, -Reset ODO, Rdt=240ms
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • RP110N191BSOT-23-5LDO regulator, 5 pins, RicohLDO regulatorSOT-23-55 pinsRicoh
    What it is
    LDO regulator
    Maker
    Ricoh
    Package
    SOT-23-5
    Pins
    5
    Details
    Linear voltage regulator IC: LDO, 1.9V±1%, 150mA, +CE
    Source
    Published code list

    Is it dead? The meter test is below: Voltage regulator.

  • XC31PNS0019AMSOT-233 pins, TorexNot recordedSOT-233 pinsTorex
    What it is
    Not recorded
    Maker
    Torex
    Package
    SOT-23
    Pins
    3
    Details
    VR-IC: Temperature Sensitive, -T°coefficient, 1,9V±5%, 50mA
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • XC31PNS0019APSOT-893 pins, TorexNot recordedSOT-893 pinsTorex
    What it is
    Not recorded
    Maker
    Torex
    Package
    SOT-89
    Pins
    3
    Details
    VR-IC: Temperature Sensitive, -T°coefficient, 1,9V±5%, 50mA
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • XC31PPS0019AMSOT-233 pins, TorexNot recordedSOT-233 pinsTorex
    What it is
    Not recorded
    Maker
    Torex
    Package
    SOT-23
    Pins
    3
    Details
    VR-IC: Temperature Sensitive, +T°coefficient, 1,9V±5%, 50mA
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • 4 more parts have no package on record
    • AP2P053NP-channel MOSFET, Advanced Power ElectronicsP-channel MOSFETNot recordedNot recordedAdvanced Power Electronics
      What it is
      P-channel MOSFET
      Maker
      Advanced Power Electronics
      Package
      Not recorded
      Pins
      Not recorded
      Details
      20 V, 4.2 A P-channel MOSFET
      Source
      Manufacturer datasheet

      Is it dead? The meter test is below: P-channel MOSFET.

      Datasheetfor AP2P053N, opens in a new tab
    • 2SK436JFET, SanyoJFETNot recordedNot recordedSanyo
      What it is
      JFET
      Maker
      Sanyo
      Package
      Not recorded
      Pins
      Not recorded
      Details
      N-channel JFET
      Source
      Published code list

      Is it dead? The meter test is below: JFET.

    • 2SK436-19Sanyo ElectricNot recordedNot recordedNot recordedSanyo Electric
      What it is
      Not recorded
      Maker
      Sanyo Electric
      Package
      Not recorded
      Pins
      Not recorded
      Details
      FET n-type: RF-AM, LN, 15V, 20mA, 150mW, Idss=2.5..4.2mA
      Source
      Published code list

      Is it dead? The meter test is below: MOSFET.

    • KIC77A19MVoltage supervisor, KECVoltage supervisorNot recordedNot recordedKEC
      What it is
      Voltage supervisor
      Maker
      KEC
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.9V±1%, -Reset ODO, Rdt=240ms
      Source
      Published code list

      Is it dead? The meter test is below: Integrated circuit.

Is it dead? One meter test per kind

Parts of the same kind are tested the same way, so each test is here once. Each part above points to its own.

P-channel MOSFET

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

Working, it reads

Red probe on the drain, black on the source: 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. 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.

JFET

Ohms range for drain to source, diode range for the gate, part lifted.

Working, it reads

Drain to source conducts both ways at a few hundred ohms, depending on the part, and some meters beep on it. The gate reads one junction to drain and to source, about 0.6 to 0.7 V, and open the other way.

Dead, it reads

  • The gate the same both ways to drain or source, near 0 V with a continuous beep: gate shorted.
  • Drain to source open: the channel has failed open.
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:
Drain to source resistance varies from part to part. An identical part elsewhere on the board shows what is normal.
Watch for:
A good channel can beep like a short between drain and source. That is normal; the gate junction says whether it has failed.

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

MOSFET

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

Working, it reads

One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.

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.
  • No body diode at all: failed open.
On the board
the gate usually has a resistor to the source, which reads as that resistor and is not a fault. 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.

Integrated circuit

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.

Voltage regulator

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.

Printed with a code easy to misread as A19

One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.

Codes that begin with A19

For a marking with its end worn or burnt off. Each code has a page of its own.

Codes not listed here are printed on 27 more parts.

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