SMD code A3p
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, p, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and A3 was searched.
224 parts are printed A3p
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.
KDS181SOT-23Switching diode, 3 pins, KECSwitching diodeSOT-233 pinsKEC
- What it is
- Switching diode
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
L1SS181LT1GSOT-23Switching diode, 3 pins, HXYSwitching diodeSOT-233 pinsHXY
- What it is
- Switching diode
- Maker
- HXY
- Package
- SOT-23
- Pins
- 3
- Details
- Switching diode, 85 V, 0.1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
LBSS4350SY3T1GSOT-89NPN transistor, 3 pins, LRCNPN transistorSOT-893 pinsLRC
- What it is
- NPN transistor
- Maker
- LRC
- Package
- SOT-89
- Pins
- 3
- Details
- Bipolar transistor, NPN, IC 3000 mA, VCEO 50 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
MM3Z43BWSOD-323Zener diode, 2 pins, YFWZener diodeSOD-3232 pinsYFW
- What it is
- Zener diode
- Maker
- YFW
- Package
- SOD-323
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
MMBD2835SOT-23Switching diode, 3 pins, Taitron ComponentsSwitching diodeSOT-233 pinsTaitron Components
- What it is
- Switching diode
- Maker
- Taitron Components
- Package
- SOT-23
- Pins
- 3
- Details
- Switching diode, 35 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
MMBD4448SOT-23Switching diode, 3 pins, Taitron ComponentsSwitching diodeSOT-233 pinsTaitron Components
- What it is
- Switching diode
- Maker
- Taitron Components
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
MMBD4448HTSOT-523Switching diode, 3 pins, Galaxy MicroelectronicsSwitching diodeSOT-5233 pinsGalaxy Microelectronics
- What it is
- Switching diode
- Maker
- Galaxy Microelectronics
- Package
- SOT-523
- Pins
- 3
- Details
- 0.25A, 85V, Surface Mount Small Signal Switching Diodes
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
MMBD4448HT-HFSOT-523Switching diode, 3 pins, ComchipSwitching diodeSOT-5233 pinsComchip
- What it is
- Switching diode
- Maker
- Comchip
- Package
- SOT-523
- Pins
- 3
- Details
- 85 V, 250 mA switching diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
7 more parts have no package on record
KDS120ESwitching diode, KECSwitching diodeNot recordedNot recordedKEC
- What it is
- Switching diode
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
KDS120VSwitching diode, KECSwitching diodeNot recordedNot recordedKEC
- What it is
- Switching diode
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
KDZ33EVZener diode, KECZener diodeNot recordedNot recordedKEC
- What it is
- Zener diode
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
KDZ33VZener diode, KECZener diodeNot recordedNot recordedKEC
- What it is
- Zener diode
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Zener diode.
L1SS360TT1GSwitching diode, LRCSwitching diodeNot recordedNot recordedLRC
- What it is
- Switching diode
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Switching diode, VR 80 V, IF 200 mA, VF Max 0.75 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
LFCN-900+RF filter, Mini-CircuitsRF filterNot recordedNot recordedMini-Circuits
- What it is
- RF filter
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LTCC filter
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
LMP21D5X6T3BGDual P-channel MOSFET, LRCDual P-channel MOSFETNot recordedNot recordedLRC
- What it is
- Dual P-channel MOSFET
- Maker
- LRC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET, Dual-P-Channel(with ESD), VDSS 20 V, VGS 6 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET pair.
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.
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.
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.
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.
P-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 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.
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