SMD code W2F
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.
5 parts are printed W2F
Not sure which one you have?
Answer up to 4 quick questions and these 5 parts are ranked, with a meter test that settles it. It works on a dead part too.
KIC73B263T2SOT-23Voltage supervisor, KECVoltage supervisorSOT-23KEC
- What it is
- Voltage supervisor
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.63V±1%, -Reset PPO, Rdt=50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
PMBT2907ASOT-23PNP transistor, NXPPNP transistorSOT-23NXP
- What it is
- PNP transistor
- Maker
- NXP
- Package
- SOT-23
- Pins
- 3
- Details
- 60 V, 600 mA PNP switching transistor
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
PMST2907ASOT-323PNP transistor, PhilipsPNP transistorSOT-323Philips
- What it is
- PNP transistor
- Maker
- Philips
- Package
- SOT-323
- Pins
- 3
- Details
- 60 V, 600 mA PNP switching transistor
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2 more parts have no package on record
KIC73B263M2Voltage supervisor, KECVoltage supervisorNot recordedKEC
- What it is
- Voltage supervisor
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.63V±1%, -Reset PPO, Rdt=50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
TSDF1220RWRF transistor, VishayRF transistorNot recordedVishay
- What it is
- RF transistor
- Maker
- Vishay
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-npn: UHF-VHF, LN, 9V, 40mA, 200mW, B=50..150, 12GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
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.
Integrated circuit
Voltage with the board powered; ohms from each pin to ground with it off.
Working, it reads
Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.
Dead, it reads
- A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
- Supply present, output stuck: failed, or its load has.
- On the board:
- A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
- Compare:
- The surest reference is the same IC on a working board, measured pin by pin.
- Watch for:
- Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.
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.
Bipolar transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour 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.
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