SMD code AM-
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.
214 parts are printed AM-
Not sure which one you have?
Answer up to 4 quick questions and these 50 parts are ranked, with a meter test that settles it. It works on a dead part too.
MIC803-41D3VC3SOT-323Voltage supervisor, 3 pins, MicrelVoltage supervisorSOT-3233 pinsMicrel
- What it is
- Voltage supervisor
- Maker
- Micrel
- Package
- SOT-323
- Pins
- 3
- Details
- Microprocessor reset circuit
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MIC803-41D3VM3SOT-23Voltage supervisor, 3 pins, MicrelVoltage supervisorSOT-233 pinsMicrel
- What it is
- Voltage supervisor
- Maker
- Micrel
- Package
- SOT-23
- Pins
- 3
- Details
- Microprocessor reset circuit
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MM3Z5222BSOD-323Zener diode, 2 pins, BytesonicZener diodeSOD-3232 pinsBytesonic
- What it is
- Zener diode
- Maker
- Bytesonic
- Package
- SOD-323
- Pins
- 2
- Details
- Zener diode: 2.5V±5%, Izt=20mA, Zzt=30, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
MMBT3904TT1SOT-4163 pins, onsemiNot recordedSOT-4163 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-416
- Pins
- 3
- Details
- equivalent 2N3904
- Source
- Published code list
Is it dead? The meter test is below: This part.
MMBT3904WSOT-23NPN transistor, 3 pins, onsemiNPN transistorSOT-233 pinsonsemi
- What it is
- NPN transistor
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
MMBT3904WT1SOT-3233 pins, onsemiNot recordedSOT-3233 pinsonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- SOT-323
- Pins
- 3
- Details
- equivalent 2N3904
- Source
- Published code list
Is it dead? The meter test is below: This part.
NL27WZ02MU1DFNonsemiNot recordedDFNNot recordedonsemi
- What it is
- Not recorded
- Maker
- onsemi
- Package
- DFN
- Pins
- Not recorded
- Details
- CMOS logic IC: Dual 2-input NOR gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
NZ8F6V2MX2WT5GSOD-882Zener diode, 2 pins, onsemiZener diodeSOD-8822 pinsonsemi
- What it is
- Zener diode
- Maker
- onsemi
- Package
- SOD-882
- Pins
- 2
- Details
- Zener diode: 5.89..6.51V, Izt=5mA, Zzt=60, 250mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
P4SMA9.1ASMATVS diode, 2 pins, FagTVS diodeSMA2 pinsFag
- What it is
- TVS diode
- Maker
- Fag
- Package
- SMA
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMA9V1ASMATVS diode, 2 pins, Fagor ElectronicaTVS diodeSMA2 pinsFagor Electronica
- What it is
- TVS diode
- Maker
- Fagor Electronica
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=8.65..9.55V, Vrwm=8.1V, 29.9A, 400W (1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMAJ7.0ASMA2 pins, Micro Commercial ComponentsNot recordedSMA2 pinsMicro Commercial Components
- What it is
- Not recorded
- Maker
- Micro Commercial Components
- Package
- SMA
- Pins
- 2
- Details
- TVS: 7.0V, 33.3A, 400W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P6SMBJ7.0ACSMB2 pins, PanjitNot recordedSMB2 pinsPanjit
- What it is
- Not recorded
- Maker
- Panjit
- Package
- SMB
- Pins
- 2
- Details
- TVS: 7V, 50A, 600W(1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P6SMBJ7.0CASMBTVS diode, 2 pins, PanjitTVS diodeSMB2 pinsPanjit
- What it is
- TVS diode
- Maker
- Panjit
- Package
- SMB
- Pins
- 2
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
PMEG3005ElSOD-882Schottky diode, 2 pins, NXPSchottky diodeSOD-8822 pinsNXP
- What it is
- Schottky diode
- Maker
- NXP
- Package
- SOD-882
- Pins
- 2
- Details
- Diode: SBR, 30V, 0.5A, Vf<0.5V(0.5A), <30pF
- Source
- Published code list
Is it dead? The meter test is below: Schottky diode.
PMF7.0ASOD-123FTVS diode, 2 pins, StarHopeTVS diodeSOD-123F2 pinsStarHope
- What it is
- TVS diode
- Maker
- StarHope
- Package
- SOD-123F
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=7.78..8.60V, Vrwm=7.0V, Ipp=16.7A, 200W(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.
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.
Zener diode
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.
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.
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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- A reading the wrong way round as well: leaky.
- Open both ways: 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:
- If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
- Watch for:
- A large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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