SMD code P01 in SOT-23
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.
8 parts in SOT-23 are printed P01
Not sure which one you have?
Answer up to 4 quick questions and these 8 parts are ranked, with a meter test that settles it. It works on a dead part too.
all SOT-23, 3 pins. What differs:
DDTA113TCASOT-23Digital transistor (PNP, resistors built in), Diodes IncorporatedDigital transistor (PNP, resistors built in)Diodes Incorporated
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- dtr pnp 50V 0.1A R11k0 0.2W
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
DDTA113TKASOT-23Digital transistor (PNP, resistors built in), Diodes IncorporatedDigital transistor (PNP, resistors built in)Diodes Incorporated
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- dtr pnp 50V 0.1A R1 1k0 0.2W
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
HE61CN4001MRSOT-23Voltage supervisor, Heermicr SemicconductorVoltage supervisorHeermicr Semicconductor
- What it is
- Voltage supervisor
- Maker
- Heermicr Semicconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 4.0V±1%, +Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
HE7040MNNR1SOT-23Voltage supervisor, Heermicr SemicconductorVoltage supervisorHeermicr Semicconductor
- What it is
- Voltage supervisor
- Maker
- Heermicr Semicconductor
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 4.0V±1%, +Reset ODO
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
PDTA143ETSOT-23Digital transistor (PNP, resistors built in)Digital transistor (PNP, resistors built in)Not recorded
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- Not recorded
- Package
- SOT-23
- Pins
- 3
- Details
- 50 V, 100 mA PNP resistor-equipped transistor; R1 = 4.7 kOhm, R2 = 4.7 kOhm
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
SO2906SOT-23STMicroelectronicsNot recordedSTMicroelectronics
- What it is
- Not recorded
- Maker
- STMicroelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- equivalent 2N2906
- Source
- Published code list
Is it dead? The meter test is below: This part.
SST201SOT-23SiliconixNot recordedSiliconix
- What it is
- Not recorded
- Maker
- Siliconix
- Package
- SOT-23
- Pins
- 3
- Details
- n-FET: AF, LN, 40V, 350mW, Idss=0.2..1mA, Up<1,5V
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
ZXTP5401FLSOT-23Diodes IncorporatedNot recordedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- pnp 150V 600mA comp ZXTN5551
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
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.
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.
MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
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.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and 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.
Printed with a code easy to misread as P01
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with P01
For a marking with its end worn or burnt off. Each code has a page of its own.
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