SMD code PO
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.
26 parts are printed PO
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.
KRA113SSOT-23Digital transistor (PNP, resistors built in), 3 pins, KECDigital transistor (PNP, resistors built in)SOT-233 pinsKEC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
KRA313SOT-323Digital transistor (PNP, resistors built in), 3 pins, KECDigital transistor (PNP, resistors built in)SOT-3233 pinsKEC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- KEC
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
2SA1712-OSOT-23PNP transistor, 3 pins, ToshibaPNP transistorSOT-233 pinsToshiba
- What it is
- PNP transistor
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: Sw, 29V, 30mA, 200mW, B=70..140, 15/110ns
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SC2884-OSOT-89NPN transistor, 3 pins, ToshibaNPN transistorSOT-893 pinsToshiba
- What it is
- NPN transistor
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn: GP, 35V, 800mA, 500mW, B=70..140, 120MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC2884OSOT-893 pins, ToshibaNot recordedSOT-893 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- pnp af amp hfe 100-200 comp 2SA1204
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SJ212SOT-893 pins, NEC ElectronicsNot recordedSOT-893 pinsNEC Electronics
- What it is
- Not recorded
- Maker
- NEC Electronics
- Package
- SOT-89
- Pins
- 3
- Details
- p-MOS*-e: V-MOS, Sw, 60V, ±0,5A, <3Ω(0,5A)
- Source
- Published code list
Is it dead? The meter test is below: This part.
AX6645WZ6DFNLDO regulator, AXElite TechnologyLDO regulatorDFNNot recordedAXElite Technology
- What it is
- LDO regulator
- Maker
- AXElite Technology
- Package
- DFN
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, Dual out., Vo1/Vo2=1.2V/2.8V±2%, 200mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
BAR64SOT-23PIN diode, 3 pins, InfineonPIN diodeSOT-233 pinsInfineon
- What it is
- PIN diode
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Details
- single 200V RF pin
- Source
- Published code list
Is it dead? The meter test is below: PIN diode or varicap.
7 more parts have no package on record
KRA313EDigital transistor (PNP, resistors built in), KECDigital transistor (PNP, resistors built in)Not recordedNot recordedKEC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
KRA313VDigital transistor (PNP, resistors built in), KECDigital transistor (PNP, resistors built in)Not recordedNot recordedKEC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
KRA563EDigital transistor (PNP, resistors built in), KECDigital transistor (PNP, resistors built in)Not recordedNot recordedKEC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
KRA563UDigital transistor (PNP, resistors built in), KECDigital transistor (PNP, resistors built in)Not recordedNot recordedKEC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
KRA763EDigital transistor (PNP, resistors built in), KECDigital transistor (PNP, resistors built in)Not recordedNot recordedKEC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
KRA763UDigital transistor (PNP, resistors built in), KECDigital transistor (PNP, resistors built in)Not recordedNot recordedKEC
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Digital transistor.
AX6645WCTLDO regulator, AXElite TechnologyLDO regulatorNot recordedNot recordedAXElite Technology
- What it is
- LDO regulator
- Maker
- AXElite Technology
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Linear voltage regulator IC: LDO, Dual out., Vo1/Vo2=1.2V/2.8V±2%, 200mA, +CE
- Source
- Published code list
Is it dead? The meter test is below: Voltage regulator.
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.
Digital transistor
Ohms range, part lifted. The datasheet gives the built-in resistors: R1 in series with the base, R2 from base to emitter.
Working, it reads
Base to emitter reads about R1 plus R2 either way round, about 20 kΩ on a 10 k and 10 k part, give or take their wide tolerance. Collector to emitter reads open. A part with no R2 reads a junction behind R1 one way instead.
Dead, it reads
- Collector to emitter the same both ways, near 0 Ω with a continuous beep: shorted.
- From the base, open or far above R1 plus R2: R1 has failed. Static damage shows here most often.
- Base to emitter near 0 Ω: failed short.
- 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:
- The readings depend on the resistor values, so an identical part elsewhere on the board is the surest reference. Measure it the same way.
- Watch for:
- On the diode range a good part with 10 kΩ resistors reads open on every pair, so a good part looks dead there. Use the ohms range.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
PNP transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
Black 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.
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.
Voltage regulator
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
- Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
- Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
- Power off, input to output near 0 Ω: shorted.
- On the board:
- An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
- Compare:
- The same regulator on another rail or another board shows the right voltages and the right resistances.
- Watch for:
- Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
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.
Printed with a code easy to misread as PO
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 1 more part.
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