SMD code -1P
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.
125 parts are printed -1P
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.
SST2222AT116SOT-23NPN transistor, 3 pins, HXYNPN transistorSOT-233 pinsHXY
- What it is
- NPN transistor
- Maker
- HXY
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor, 40 V, 0.6 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
TMMBT2222ASOT-23NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-233 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 40V, 0.6A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
TMMBT2222AMSOT-723NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-7233 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-723
- Pins
- 3
- Details
- 40V, 0.6A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
TMMBT2222ATSOT-523NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-5233 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-523
- Pins
- 3
- Details
- 40V, 0.6A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
TPZT2222ASOT-223NPN transistor, 4 pins, Galaxy MicroelectronicsNPN transistorSOT-2234 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-223
- Pins
- 4
- Details
- 40V, 0.6A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
WT2222ASOT-233 pins, WayonNot recordedSOT-233 pinsWayon
- What it is
- Not recorded
- Maker
- Wayon
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
WT2222AHSOT-7233 pins, WayonNot recordedSOT-7233 pinsWayon
- What it is
- Not recorded
- Maker
- Wayon
- Package
- SOT-723
- Pins
- 3
- Details
- Bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
BTN2222AN3SOT-23NPN transistor, 3 pins, CYStekNPN transistorSOT-233 pinsCYStek
- What it is
- NPN transistor
- Maker
- CYStek
- Package
- SOT-23
- Pins
- 3
- Details
- 50 V, 0.6 A NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
HBN2411S6RSOT-363Dual NPN transistor, 6 pins, CYStekDual NPN transistorSOT-3636 pinsCYStek
- What it is
- Dual NPN transistor
- Maker
- CYStek
- Package
- SOT-363
- Pins
- 6
- Details
- 50 V, 0.6 A dual NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor pair.
MMBT2222AWSOT-323NPN transistor, 3 pins, YFWNPN transistorSOT-3233 pinsYFW
- What it is
- NPN transistor
- Maker
- YFW
- Package
- SOT-323
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2N2222ASSOT-23NPN transistor, 3 pins, First SilionNPN transistorSOT-233 pinsFirst Silion
- What it is
- NPN transistor
- Maker
- First Silion
- Package
- SOT-23
- Pins
- 3
- Details
- NPN transistor: GP, 40V, 600mA, 350mW, B=100..300, 300MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2N2222AUSOT-323NPN transistor, 3 pins, First SilionNPN transistorSOT-3233 pinsFirst Silion
- What it is
- NPN transistor
- Maker
- First Silion
- Package
- SOT-323
- Pins
- 3
- Details
- NPN transistor: GP, 40V, 600mA, 150mW, B=100..300, 300MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
BC807-40SOT-23PNP transistor, 3 pins, KECPNP transistorSOT-233 pinsKEC
- What it is
- PNP transistor
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- -45 V, -500 mA PNP small-signal transistor, gain group 40
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2 more parts have no package on record
2N2222AENPN transistor, First SilionNPN transistorNot recordedNot recordedFirst Silion
- What it is
- NPN transistor
- Maker
- First Silion
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: GP, 40V, 600mA, 150mW, B=100..300, 300MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
ATF-511P88 pins, BroadcomNot recordedNot recorded8 pinsBroadcom
- What it is
- Not recorded
- Maker
- Broadcom
- Package
- Not recorded
- Pins
- 8
- Details
- High Linearity Enhancement Mode Pseudomorphic HEMT
- 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.
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.
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.
NPN transistor pair
Diode range, part lifted. Test each transistor on its own pins, as the datasheet's pinout gives them.
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.
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.
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