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WhatSMDSign in

SMD code IR

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.

31 parts are printed IR

Not sure which one you have?

Answer up to 4 quick questions and these 31 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • P4SMAFJ17ASMAFTVS diode, 2 pins, Blue RocketTVS diodeSMAF2 pinsBlue Rocket
    What it is
    TVS diode
    Maker
    Blue Rocket
    Package
    SMAF
    Pins
    2
    Details
    TVS diode, unidirectional
    Source
    Manufacturer datasheet

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

    Datasheetfor P4SMAFJ17A, opens in a new tab
  • PTVSHC1RF17VBSOD-123FTVS diode, 2 pins, PrisemiTVS diodeSOD-123F2 pinsPrisemi
    What it is
    TVS diode
    Maker
    Prisemi
    Package
    SOD-123F
    Pins
    2
    Details
    TVS diode, 17 V working, bidirectional
    Source
    Manufacturer datasheet

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

    Datasheetfor PTVSHC1RF17VB, opens in a new tab
  • SDFL17A-CSOD-123FTVS diode, 2 pins, SeCoSTVS diodeSOD-123F2 pinsSeCoS
    What it is
    TVS diode
    Maker
    SeCoS
    Package
    SOD-123F
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor SDFL17A-C, opens in a new tab
  • SMAJ17ASMATVS diode, 2 pins, JieJieTVS diodeSMA2 pinsJieJie
    What it is
    TVS diode
    Maker
    JieJie
    Package
    SMA
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAJ17A, opens in a new tab
  • SMAJ17A-AUSMATVS diode, 2 pins, JieJieTVS diodeSMA2 pinsJieJie
    What it is
    TVS diode
    Maker
    JieJie
    Package
    SMA
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAJ17A-AU, opens in a new tab
  • SMF17ASOD-123FTVS diode, 2 pins, Taitron ComponentsTVS diodeSOD-123F2 pinsTaitron Components
    What it is
    TVS diode
    Maker
    Taitron Components
    Package
    SOD-123F
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor SMF17A, opens in a new tab
  • 2SB0792-RSOT-23PNP transistor, 3 pins, PanasonicPNP transistorSOT-233 pinsPanasonic
    What it is
    PNP transistor
    Maker
    Panasonic
    Package
    SOT-23
    Pins
    3
    Details
    PNP transistor: AF, LN, 150V, 50mA, 200mW, B=130..220, 200MHz
    Source
    Published code list

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

  • 2SB792-RSOT-233 pins, PanNot recordedSOT-233 pinsPan
    What it is
    Not recorded
    Maker
    Pan
    Package
    SOT-23
    Pins
    3
    Details
    Si-pnp: GP, AF, LN, 150V, 50mA, 200mW, B=130..220, 200MHz
    Source
    Published code list

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

  • 2SB1073SOT-89PNP transistor, 3 pins, Galaxy MicroelectronicsPNP transistorSOT-893 pinsGalaxy Microelectronics
    What it is
    PNP transistor
    Maker
    Galaxy Microelectronics
    Package
    SOT-89
    Pins
    3
    Source
    Published code list

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

  • 2SB1073-RSOT-893 pins, Micro Commercial ComponentsNot recordedSOT-893 pinsMicro Commercial Components
    What it is
    Not recorded
    Maker
    Micro Commercial Components
    Package
    SOT-89
    Pins
    3
    Details
    Si-pnp: AF, Lo-sat, 30V, 4A, 1W, B=180..315, 120MHz
    Source
    Published code list

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

  • 2SB1220-RSOT-3233 pins, PanNot recordedSOT-3233 pinsPan
    What it is
    Not recorded
    Maker
    Pan
    Package
    SOT-323
    Pins
    3
    Details
    Si-pnp: AF, LN, 150V, 100mA, 150mW, B=130..220, 200MHz
    Source
    Published code list

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

  • 2SB1463-RSOT-233 pins, PanNot recordedSOT-233 pinsPan
    What it is
    Not recorded
    Maker
    Pan
    Package
    SOT-23
    Pins
    3
    Details
    Si-pnp: GP, 150V, 50mA, 200MHz, B=180..390
    Source
    Published code list

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

  • 2SC3515-RSOT-89NPN transistor, 3 pins, ToshibaNPN transistorSOT-893 pinsToshiba
    What it is
    NPN transistor
    Maker
    Toshiba
    Package
    SOT-89
    Pins
    3
    Details
    Si-npn: HV, 300V, 100mA, 500mW, 80MHz, B=30..90
    Source
    Published code list

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

  • 2SC3722K-RSOT-23NPN transistor, 3 pins, ROHMNPN transistorSOT-233 pinsROHM
    What it is
    NPN transistor
    Maker
    ROHM
    Package
    SOT-23
    Pins
    3
    Details
    Si-npn: AF-Drv, 120V, 50mA, 200mW, B=120..390, >140MHz
    Source
    Published code list

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

  • CD214A-T17ASMATVS diode, 2 pins, BournsTVS diodeSMA2 pinsBourns
    What it is
    TVS diode
    Maker
    Bourns
    Package
    SMA
    Pins
    2
    Details
    TVS: 17V, 14.5A, 400W(1ms)
    Source
    Published code list

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

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.

PNP transistor

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.

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.

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.

Printed with a code easy to misread as IR

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

Codes not listed here are printed on 4 more parts.

Did you find your part?

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