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WhatSMDSign in

SMD code AAX

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.

21 parts are printed AAX

Not sure which one you have?

Answer up to 4 quick questions and these 21 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • 1.0SMBJ10CASMBTVS diode, 2 pins, SOCAYTVS diodeSMB2 pinsSOCAY
    What it is
    TVS diode
    Maker
    SOCAY
    Package
    SMB
    Pins
    2
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: TVS or ESD protection diode.

    Datasheetfor 1.0SMBJ10CA, opens in a new tab
  • MMBTA42SOT-23NPN transistor, 3 pins, KECNPN transistorSOT-233 pinsKEC
    What it is
    NPN transistor
    Maker
    KEC
    Package
    SOT-23
    Pins
    3
    Details
    NPN bipolar transistor
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: NPN transistor.

    Datasheetfor MMBTA42, opens in a new tab
  • NCS20081SQ2SOT-323Operational amplifier, 3 pins, onsemiOperational amplifierSOT-3233 pinsonsemi
    What it is
    Operational amplifier
    Maker
    onsemi
    Package
    SOT-323
    Pins
    3
    Details
    Operational Amplifier, Low Power, 1.2 MHz, 42  A
    Source
    Manufacturer datasheet

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

    Datasheetfor NCS20081SQ2, opens in a new tab
  • NCV20081SQ2SOT-323Operational amplifier, 3 pins, onsemiOperational amplifierSOT-3233 pinsonsemi
    What it is
    Operational amplifier
    Maker
    onsemi
    Package
    SOT-323
    Pins
    3
    Details
    Operational Amplifier, Low Power, 1.2 MHz, 42  A
    Source
    Manufacturer datasheet

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

    Datasheetfor NCV20081SQ2, opens in a new tab
  • SMAF10ASMAFTVS diode, 2 pins, Galaxy MicroelectronicsTVS diodeSMAF2 pinsGalaxy Microelectronics
    What it is
    TVS diode
    Maker
    Galaxy Microelectronics
    Package
    SMAF
    Pins
    2
    Details
    10V, 400W, Surface Mount TVS
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: TVS or ESD protection diode.

    Datasheetfor SMAF10A, opens in a new tab
  • SMAJ10ASMATVS diode, 2 pins, Galaxy MicroelectronicsTVS diodeSMA2 pinsGalaxy Microelectronics
    What it is
    TVS diode
    Maker
    Galaxy Microelectronics
    Package
    SMA
    Pins
    2
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: TVS or ESD protection diode.

    Datasheetfor SMAJ10A, opens in a new tab
  • SMB10J10CASMBTVS diode, 2 pins, DOWOTVS diodeSMB2 pinsDOWO
    What it is
    TVS diode
    Maker
    DOWO
    Package
    SMB
    Pins
    2
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: TVS or ESD protection diode.

    Datasheetfor SMB10J10CA, opens in a new tab
  • TSMAJ10ASMATVS diode, 2 pins, Galaxy MicroelectronicsTVS diodeSMA2 pinsGalaxy Microelectronics
    What it is
    TVS diode
    Maker
    Galaxy Microelectronics
    Package
    SMA
    Pins
    2
    Details
    10V, 400W, Surface Mount TVS
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: TVS or ESD protection diode.

    Datasheetfor TSMAJ10A, opens in a new tab
  • TVJ10B100JB-HFSMBTVS diode, 2 pins, ComchipTVS diodeSMB2 pinsComchip
    What it is
    TVS diode
    Maker
    Comchip
    Package
    SMB
    Pins
    2
    Details
    10 V 1000 W bidirectional TVS diode
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: TVS or ESD protection diode.

    Datasheetfor TVJ10B100JB-HF, opens in a new tab
  • HWD810SEXSOT-323Voltage supervisor, 3 pins, Chengdu Sino MicroelectronicsVoltage supervisorSOT-3233 pinsChengdu Sino Microelectronics
    What it is
    Voltage supervisor
    Maker
    Chengdu Sino Microelectronics
    Package
    SOT-323
    Pins
    3
    Details
    Voltage detector IC: 2.93V±2%, +Reset PPO
    Source
    Published code list

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

  • MAX810SXRSOT-3233 pins, Analog DevicesNot recordedSOT-3233 pinsAnalog Devices
    What it is
    Not recorded
    Maker
    Analog Devices
    Package
    SOT-323
    Pins
    3
    Details
    microproc +ve reset gen 3.3V
    Source
    Published code list

    Is it dead? The meter test is below: This part.

  • MAX824SXKSOT-3535 pins, Analog DevicesNot recordedSOT-3535 pinsAnalog Devices
    What it is
    Not recorded
    Maker
    Analog Devices
    Package
    SOT-353
    Pins
    5
    Source
    Published code list

    Is it dead? The meter test is below: This part.

  • MAX4335EXT-TSOT-3636 pins, Maxim IntegratedNot recordedSOT-3636 pinsMaxim Integrated
    What it is
    Not recorded
    Maker
    Maxim Integrated
    Package
    SOT-363
    Pins
    6
    Details
    Lin-IC: AF PA, 2,7..5,5V, 40mW(3V/32Ω)
    Source
    Published code list

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

  • MAX6386XS17D3SOT-3434 pins, Analog DevicesNot recordedSOT-3434 pinsAnalog Devices
    What it is
    Not recorded
    Maker
    Analog Devices
    Package
    SOT-343
    Pins
    4
    Source
    Published code list

    Is it dead? The meter test is below: This part.

  • 1 more part has no package on record
    • MAX6410BS444 pins, Analog DevicesNot recordedNot recorded4 pinsAnalog Devices
      What it is
      Not recorded
      Maker
      Analog Devices
      Package
      Not recorded
      Pins
      4
      Source
      Published code list

      Is it dead? The meter test is below: This part.

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.

TVS or ESD protection diode

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
, 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.

NPN transistor

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

Working, it reads

Red 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.

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.

This part

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.

Did you find your part?

Open this in the search to correct a character or try another package.