SMD code A1s
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.
The last letter, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and A1 was searched.
211 parts are printed A1s
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.
BAW56-P2-HFSOT-23Switching diode, 3 pins, ComchipSwitching diodeSOT-233 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- 75 V, 250 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAW56,215SOT-23Switching diode, 3 pins, HXYSwitching diodeSOT-233 pinsHXY
- What it is
- Switching diode
- Maker
- HXY
- Package
- SOT-23
- Pins
- 3
- Details
- Switching diode, 70 V, 0.2 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAW56CR-CSOT-23Switching diode, 3 pins, SeCoSSwitching diodeSOT-233 pinsSeCoS
- What it is
- Switching diode
- Maker
- SeCoS
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAW56GPSOT-23Switching diode, 3 pins, ChenmkoSwitching diodeSOT-233 pinsChenmko
- What it is
- Switching diode
- Maker
- Chenmko
- Package
- SOT-23
- Pins
- 3
- Details
- SWITCHING DIODE, 85 V, 0.15 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAW56HSOT-23Switching diode, 3 pins, Taiwan SemiconductorSwitching diodeSOT-233 pinsTaiwan Semiconductor
- What it is
- Switching diode
- Maker
- Taiwan Semiconductor
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAW56LSOT-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.
BAW56N3SOT-23Switching diode, 3 pins, CYStekSwitching diodeSOT-233 pinsCYStek
- What it is
- Switching diode
- Maker
- CYStek
- Package
- SOT-23
- Pins
- 3
- Details
- 110 V switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAW56SSOT-363Switching diode, 6 pins, NexperiaSwitching diodeSOT-3636 pinsNexperia
- What it is
- Switching diode
- Maker
- Nexperia
- Package
- SOT-363
- Pins
- 6
- Details
- High-speed switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAW56TSOT-416Switching diode, 3 pins, onsemiSwitching diodeSOT-4163 pinsonsemi
- What it is
- Switching diode
- Maker
- onsemi
- Package
- SOT-416
- Pins
- 3
- Details
- 0.155A, 85V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAW56WSOT-323Switching diode, 3 pins, NexperiaSwitching diodeSOT-3233 pinsNexperia
- What it is
- Switching diode
- Maker
- Nexperia
- Package
- SOT-323
- Pins
- 3
- Details
- SMD Small Signal Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BAW156SOT-23Switching diode, 3 pins, LeiditechSwitching diodeSOT-233 pinsLeiditech
- What it is
- Switching diode
- Maker
- Leiditech
- Package
- SOT-23
- Pins
- 3
- Details
- 0.16A, 85V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BB208-02SOD-523Varicap diode, 2 pins, NXPVaricap diodeSOD-5232 pinsNXP
- What it is
- Varicap diode
- Maker
- NXP
- Package
- SOD-523
- Pins
- 2
- Details
- Low voltage variable capacitance diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PIN diode or varicap.
BZX84-C75SOT-23Zener diode, 3 pins, NexperiaZener diodeSOT-233 pinsNexperia
- What it is
- Zener diode
- Maker
- Nexperia
- Package
- SOT-23
- Pins
- 3
- Pinout
- 1 anode
- 2 not connected
- 3 cathode
- Details
- 75 V approx. ±5% voltage regulator (Zener) diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
2 more parts have no package on record
BAW222Diode, InfineonDiodeNot recordedNot recordedInfineon
- What it is
- Diode
- Maker
- Infineon
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
BZX884B2V4Zener diode, Good-ArkZener diodeNot recordedNot recordedGood-Ark
- What it is
- Zener diode
- Maker
- Good-Ark
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode, VZ 2.4 V, 0.25 W
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener 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.
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.
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.
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