SMD code RO 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.
7 parts in SOT-89 are printed RO
Not sure which one you have?
Answer up to 4 quick questions and these 7 parts are ranked, with a meter test that settles it. It works on a dead part too.
all SOT-89, 3 pins. What differs:
2SA1024-OSOT-89PNP transistor, ToshibaPNP transistorToshiba
- What it is
- PNP transistor
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- Si-pnp: GP, 30V, 800mA, 500mW, B=100..200, 120MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA1204SOT-89PNP transistor, Galaxy MicroelectronicsPNP transistorGalaxy Microelectronics
- What it is
- PNP transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-89
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA1204-OSOT-89PNP transistor, ToshibaPNP transistorToshiba
- What it is
- PNP transistor
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- Si-pnp: GP, 35V, 800mA, 500mW, B=70..140, 120MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA1204OSOT-89ToshibaNot recordedToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA1664SOT-89PNP transistor, Galaxy MicroelectronicsPNP transistorGalaxy Microelectronics
- What it is
- PNP transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-89
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SA1664-OSOT-89Transys ElectronicsNot recordedTransys Electronics
- What it is
- Not recorded
- Maker
- Transys Electronics
- Package
- SOT-89
- Pins
- 3
- Details
- Si-pnp: AF, Sw, 35V, 800mA, 500mW, 120MHz, B=100..200
- Source
- Published code list
Is it dead? The meter test is below: This part.
KTA1664-OSOT-89PNP transistor, KECPNP transistorKEC
- What it is
- PNP transistor
- Maker
- KEC
- Package
- SOT-89
- Pins
- 3
- Details
- Si-pnp: AF-Drv, 35V, 800mA, 500mW, B=100..200, >120MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP 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.
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.
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.
Printed with a code easy to misread as RO
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
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