SMD code 3MW
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 3MW
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.
BC858SOT-23PNP transistor, 3 pins, PhilipsPNP transistorSOT-233 pinsPhilips
- What it is
- PNP transistor
- Maker
- Philips
- Package
- SOT-23
- Pins
- 3
- Details
- PNP bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
BC858WSOT-323PNP transistor, 3 pins, NXPPNP transistorSOT-3233 pinsNXP
- What it is
- PNP transistor
- Maker
- NXP
- Package
- SOT-323
- Pins
- 3
- Details
- PNP bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
BCV62SOT-143Dual PNP transistor, 4 pins, NXPDual PNP transistorSOT-1434 pinsNXP
- What it is
- Dual PNP transistor
- Maker
- NXP
- Package
- SOT-143
- Pins
- 4
- Details
- PNP current-mirror double transistor
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor pair.
S-19100C34A-M5T2USOT-23-5Voltage supervisor, 5 pins, ABLICVoltage supervisorSOT-23-55 pinsABLIC
- What it is
- Voltage supervisor
- Maker
- ABLIC
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 3.4V±3%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
S-19100C34A-N4T2USOT-343Voltage supervisor, 4 pins, ABLICVoltage supervisorSOT-3434 pinsABLIC
- What it is
- Voltage supervisor
- Maker
- ABLIC
- Package
- SOT-343
- Pins
- 4
- Details
- Voltage detector IC: 3.4V±3%, -Reset PPO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
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.
PNP transistor pair
Diode range, part lifted. Test each transistor on its own pins, as the datasheet's pinout gives them.
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.
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.
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