SMD code A1-
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.
202 parts are printed A1-
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.
S-LBAW56DW1T1GSOT-363Switching diode, 6 pins, LRCSwitching diodeSOT-3636 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOT-363
- Pins
- 6
- Details
- Switching diode, VR 70 V, IF 200 mA, VF Max 0.715 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-LBAW56LT1GSOT-23Switching diode, 3 pins, LRCSwitching diodeSOT-233 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Switching diode, VR 100 V, IF 200 mA, VF Max 1 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-LBAW56LT1G-SSOT-23Switching diode, 3 pins, LRCSwitching diodeSOT-233 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOT-23
- Pins
- 3
- Details
- Switching diode, VR 100 V, IF 200 mA, VF Max 1 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-LBAW56WT1GSOT-323Switching diode, 3 pins, LRCSwitching diodeSOT-3233 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOT-323
- Pins
- 3
- Details
- Switching diode, VR 100 V, IF 200 mA, VF Max 1.25 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-LBAW56WT1G-SSOT-323Switching diode, 3 pins, LRCSwitching diodeSOT-3233 pinsLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- SOT-323
- Pins
- 3
- Details
- Switching diode, VR 100 V, IF 200 mA, VF Max 1.25 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
S-LSI1013N3T5GSOT-883P-channel MOSFET, 3 pins, LRCP-channel MOSFETSOT-8833 pinsLRC
- What it is
- P-channel MOSFET
- Maker
- LRC
- Package
- SOT-883
- Pins
- 3
- Details
- MOSFET, P-Channel(with ESD), VDSS 20 V, VGS 6 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
S-SOD4001-SHSOD-123FRectifier, 2 pins, LRCRectifierSOD-123F2 pinsLRC
- What it is
- Rectifier
- Maker
- LRC
- Package
- SOD-123F
- Pins
- 2
- Details
- Rectifier, VPK 50 V, IO @ TL 1 A, TL@°C 75
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SBAW56LSOT-23Switching diode, 3 pins, onsemiSwitching diodeSOT-233 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- Dual Switching Diode Common Anode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SBAW56TSOT-416Switching diode, 3 pins, onsemiSwitching diodeSOT-4163 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOT-416
- Pins
- 3
- Details
- Dual Switching Diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SBAW56WSOT-323Switching diode, 3 pins, onsemiSwitching diodeSOT-3233 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOT-323
- Pins
- 3
- Details
- Dual Switching Diode, Common Anode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SM4001FL-CSOD-123FRectifier, 2 pins, SeCoSRectifierSOD-123F2 pinsSeCoS
- What it is
- Rectifier
- Maker
- SeCoS
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
SM4001FLCR-CSOD-123FRectifier, 2 pins, SeCoSRectifierSOD-123F2 pinsSeCoS
- What it is
- Rectifier
- Maker
- SeCoS
- Package
- SOD-123F
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
3 more parts have no package on record
S-LP3401LT1GP-channel MOSFET, LRCP-channel MOSFETNot recordedNot recordedLRC
- What it is
- P-channel MOSFET
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET, P-Channel, VDSS 30 V, VGS 12 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
S-LSI1012X6T3BGDual N-channel MOSFET, LRCDual N-channel MOSFETNot recordedNot recordedLRC
- What it is
- Dual N-channel MOSFET
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET, Dual-N-Channel(with ESD), VDSS 20 V, VGS 8 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET pair.
SM4001JD-CRectifier, SeCoSRectifierNot recordedNot recordedSeCoS
- What it is
- Rectifier
- Maker
- SeCoS
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon 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.
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.
N-channel MOSFET pair
Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.
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.
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