SMD code A12 in SMB
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.
3 parts in SMB are printed A12
Not sure which one you have?
Answer up to 4 quick questions and these 8 parts are ranked, with a meter test that settles it. It works on a dead part too.
10BJ12ASMBTVS diode, 2 pins, JieJieTVS diode2 pinsJieJie
- What it is
- TVS diode
- Maker
- JieJie
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
10BJ12A-AUSMBTVS diode, 2 pins, JieJieTVS diode2 pinsJieJie
- What it is
- TVS diode
- Maker
- JieJie
- Package
- SMB
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
10SMBJ12ASMBTVS diode, 2 pins, UN SemiconductorTVS diode2 pinsUN Semiconductor
- What it is
- TVS diode
- Maker
- UN Semiconductor
- Package
- SMB
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=12.0V, Vbr=13.30..14.70V, Ipp=50.3A, 1000W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
5 more parts have no package on record. Nothing rules them out, so they stay.
SM2412NSANN-channel MOSFET, Sinopower SemiconductorN-channel MOSFETNot recordedSinopower Semiconductor
- What it is
- N-channel MOSFET
- Maker
- Sinopower Semiconductor
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 20 V, 5.5 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
CP2212LCChiphomer TechnologyNot recordedNot recordedChiphomer Technology
- What it is
- Not recorded
- Maker
- Chiphomer Technology
- 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? The meter test is below: Integrated circuit.
DAM1MA12ESD protection diode, HitachiESD protection diodeNot recordedHitachi
- What it is
- ESD protection diode
- Maker
- Hitachi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ElectroStatic Discharge Protection diode: Vdc=9V, Vzt=11.4..12.7V, Izt=25mA, 600W(100µs)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
DAM3MA12ESD protection diode, HitachiESD protection diodeNot recordedHitachi
- What it is
- ESD protection diode
- Maker
- Hitachi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- ElectroStatic Discharge Protection diode: Vdc=9V, Vzt=11.4..12.7V, Izt=75mA, 1800W(100µs)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
XCL232B121KR-GDC-DC converter, TorexDC-DC converterNot recordedTorex
- What it is
- DC-DC converter
- Maker
- Torex
- Package
- Not recorded
- Pins
- Not recorded
- Details
- DC/DC voltage converter IC: PFM st-dwn, 1.2V±2%, 150mA, +CE
- 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.
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.
N-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 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.
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.
Printed with a code easy to misread as A12
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 A12
For a marking with its end worn or burnt off. Each code has a page of its own.
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