SMD code MO in SOT-89
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.
3 parts in SOT-89 are printed MO
Not sure which one you have?
Answer up to 4 quick questions and these 6 parts are ranked, with a meter test that settles it. It works on a dead part too.
all Toshiba. What differs:
2SC2873SOT-89NPN transistor, 3 pinsNPN transistor3 pins
- What it is
- NPN transistor
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC2873-OSOT-89NPN transistor, 3 pinsNPN transistor3 pins
- What it is
- NPN transistor
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn: GP, 30V, 1,5A, 500mW, B=50..100, 120MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC2873OSOT-893 pinsNot recorded3 pins
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- npn power hfe 70-140 comp 2SA1213
- Source
- Published code list
Is it dead? The meter test is below: This part.
3 more parts have no package on record. Nothing rules them out, so they stay.
2SC4324RF transistorRF transistorNot recorded
- What it is
- RF transistor
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: VHF-UHF, 20V, 15mA, 150mW, 10GHz, B=50..250
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
2SC4841RF transistorRF transistorNot recorded
- What it is
- RF transistor
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: VHF-UHF, LN, 20V, 15mA, 100mW, B=50..250, 10GHz
- Source
- Published code list
Is it dead? The meter test is below: Bipolar transistor.
2SC4844RF transistorRF transistorNot recorded
- What it is
- RF transistor
- Maker
- Toshiba
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: VHF-UHF, LN, 20V, 15mA, 100mW, B=50..250, 10GHz
- 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.
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.
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.
Printed with a code easy to misread as MO
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Did you find your part?
Open this in the search to correct a character or try another package.