SMD code A

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.

26 parts are printed A

Not sure which one you have?

Answer up to 4 quick questions and these 26 parts are ranked, with a meter test that settles it. It works on a dead part too.

1SS355SOD-323Switching diode, 2 pins, JSCJSwitching diodeSOD-3232 pinsJSCJ
What it is
Switching diode
Maker
JSCJ
Package
SOD-323
Pins
2
Details
Switching diode, 80 V, 100 mA
Source
From the manufacturer's datasheet
Is it dead? The meter test is below: Silicon diode.
Datasheetfor 1SS355, opens in a new tab
1SS400SOD-523Switching diode, 2 pins, JSCJSwitching diodeSOD-5232 pinsJSCJ
What it is
Switching diode
Maker
JSCJ
Package
SOD-523
Pins
2
Details
Switching diode, 80 V, 100 mA
Source
From the manufacturer's datasheet
Is it dead? The meter test is below: Silicon diode.
Datasheetfor 1SS400, opens in a new tab
BAS521WTSOD-523Switching diode, 2 pins, DiotecSwitching diodeSOD-5232 pinsDiotec
What it is
Switching diode
Maker
Diotec
Package
SOD-523
Pins
2
Details
SMD Small Signal Switching Diodes
Source
From the manufacturer's datasheet
Is it dead? The meter test is below: Silicon diode.
Datasheetfor BAS521WT, opens in a new tab
IRLMS1902SOT-23N-channel MOSFET, 3 pins, InfineonN-channel MOSFETSOT-233 pinsInfineon
What it is
N-channel MOSFET
Maker
Infineon
Package
SOT-23
Pins
3
Details
20V Single N-Channel Power MOSFET in a TSOP-6 (Micro 6) package
Source
From the manufacturer's datasheet
Is it dead? The meter test is below: N-channel MOSFET.
Datasheetfor IRLMS1902, opens in a new tab
22 more parts have no package on record
- AON1605P-channel MOSFET, Alpha & Omega SemiconductorP-channel MOSFETNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  P-channel MOSFET
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  P-channel MOSFET (8-60 V)
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: P-channel MOSFET.
  Datasheetfor AON1605, opens in a new tab
- AON1605LP-channel MOSFET, Alpha & Omega SemiconductorP-channel MOSFETNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  P-channel MOSFET
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  P-channel MOSFET (8-60 V)
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: P-channel MOSFET.
  Datasheetfor AON1605L, opens in a new tab
- AOZ8S204BLS-24ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  ESD protection for high-speed interfaces
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8S204BLS-24, opens in a new tab
- AOZ8S208BDS-03ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  ESD protection for high-speed interfaces
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8S208BDS-03, opens in a new tab
- AOZ8S208BDS-05ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  ESD protection for high-speed interfaces
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8S208BDS-05, opens in a new tab
- AOZ8S292BLS-05ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  ESD protection for high-speed interfaces
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8S292BLS-05, opens in a new tab
- AOZ8S293BLS-03ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  ESD protection for high-speed interfaces
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8S293BLS-03, opens in a new tab
- AOZ8S294BLS-05ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  ESD protection for high-speed interfaces
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8S294BLS-05, opens in a new tab
- AOZ8S325BDS-40ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  ESD protection for high-speed interfaces
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8S325BDS-40, opens in a new tab
- AOZ8654BLT-05ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8654BLT-05, opens in a new tab
- AOZ8829ADI-03ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  ESD protection for high-speed interfaces
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8829ADI-03, opens in a new tab
- AOZ8832DI-05ESD protection diode, Alpha & Omega SemiconductorESD protection diodeNot recordedNot recordedAlpha & Omega Semiconductor
  What it is
  ESD protection diode
  Maker
  Alpha & Omega Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  ESD protection for high-speed interfaces
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor AOZ8832DI-05, opens in a new tab
- BA892-02VDiode, InfineonDiodeNot recordedNot recordedInfineon
  What it is
  Diode
  Maker
  Infineon
  Package
  Not recorded
  Pins
  Not recorded
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: Silicon diode.
  Datasheetfor BA892-02V, opens in a new tab
- BAR50-02VPIN diode, InfineonPIN diodeNot recordedNot recordedInfineon
  What it is
  PIN diode
  Maker
  Infineon
  Package
  Not recorded
  Pins
  Not recorded
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: PIN diode or varicap.
  Datasheetfor BAR50-02V, opens in a new tab
- BAR50-03WPIN diode, InfineonPIN diodeNot recordedNot recordedInfineon
  What it is
  PIN diode
  Maker
  Infineon
  Package
  Not recorded
  Pins
  Not recorded
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: PIN diode or varicap.
  Datasheetfor BAR50-03W, opens in a new tab
- ESD207-B1-02ELESD protection diode, InfineonESD protection diodeNot recordedNot recordedInfineon
  What it is
  ESD protection diode
  Maker
  Infineon
  Package
  Not recorded
  Pins
  Not recorded
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor ESD207-B1-02EL, opens in a new tab
- ESD311-U1-02NESD protection diode, InfineonESD protection diodeNot recordedNot recordedInfineon
  What it is
  ESD protection diode
  Maker
  Infineon
  Package
  Not recorded
  Pins
  Not recorded
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor ESD311-U1-02N, opens in a new tab
- IRLML2402N-channel MOSFET, InfineonN-channel MOSFETNot recordedNot recordedInfineon
  What it is
  N-channel MOSFET
  Maker
  Infineon
  Package
  Not recorded
  Pins
  Not recorded
  Details
  20V Single N-Channel Power MOSFET in a Micro 3 package
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: N-channel MOSFET.
  Datasheetfor IRLML2402, opens in a new tab
- PS1201-D32ESD protection diode, PanjitESD protection diodeNot recordedNot recordedPanjit
  What it is
  ESD protection diode
  Maker
  Panjit
  Package
  Not recorded
  Pins
  Not recorded
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor PS1201-D32, opens in a new tab
- SS13MSchottky diode, Taiwan SemiconductorSchottky diodeNot recordedNot recordedTaiwan Semiconductor
  What it is
  Schottky diode
  Maker
  Taiwan Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Rectifier schottky
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: Schottky diode.
  Datasheetfor SS13M, opens in a new tab
- SS13MHSchottky diode, Taiwan SemiconductorSchottky diodeNot recordedNot recordedTaiwan Semiconductor
  What it is
  Schottky diode
  Maker
  Taiwan Semiconductor
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Rectifier schottky
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: Schottky diode.
  Datasheetfor SS13MH, opens in a new tab
- VCAN24A2-HT5ESD protection diode, VishayESD protection diodeNot recordedNot recordedVishay
  What it is
  ESD protection diode
  Maker
  Vishay
  Package
  Not recorded
  Pins
  Not recorded
  Details
  Bidirectional Symmetrical (BiSy) Low Capacitance, Dual-Line ESD Protection Diode in DFN1110-3A
  Source
  From the manufacturer's datasheet
  Is it dead? The meter test is below: TVS or ESD protection diode.
  Datasheetfor VCAN24A2-HT5, opens in a new tab

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.

Silicon diode

Diode range, part lifted or one leg off the pad. Red probe on the anode.

Working, it reads

About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.

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: failed open.
A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.

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

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.

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.

PIN diode or varicap

Diode range, part lifted or one leg off the pad. Red probe on the anode.

Working, it reads

About 0.6 to 0.9 V anode to cathode, 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.
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 varicap that has drifted in capacitance reads normal on a meter. Only a capacitance meter or the tuning itself shows it.

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.

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.

Codes that begin with A

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 856 more parts.

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