SMD code SD 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.
4 parts in SOT-89 are printed SD
Not sure which one you have?
Answer up to 4 quick questions and these 24 parts are ranked, with a meter test that settles it. It works on a dead part too.
2SC2982-DSOT-89NPN transistor, 3 pins, ToshibaNPN transistor3 pinsToshiba
- What it is
- NPN transistor
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn: Lo-sat., 30V, 2A, 500mW, B=420..600, >140MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC2982DSOT-893 pins, ToshibaNot recorded3 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-89
- Pins
- 3
- Details
- npn for med pwr strobe hfe 420-600 comp 2SA1314
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC5210-DSOT-893 pins, Isahaya ElectronicsNot recorded3 pinsIsahaya Electronics
- What it is
- Not recorded
- Maker
- Isahaya Electronics
- Package
- SOT-89
- Pins
- 3
- Details
- Si-npn: TV-Vid, 300V, 100mA, 500mW, 80MHz, B=90..180
- Source
- Published code list
Is it dead? The meter test is below: This part.
KTC4377-DSOT-89NPN transistor, 3 pins, KECNPN transistor3 pinsKEC
- What it is
- NPN transistor
- Maker
- KEC
- Package
- SOT-89
- Pins
- 3
- Details
- NPN transistor: Lo-sat, 30V, 2A, 500mW, B=240..600, 150MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
11 more parts have no package on record. Nothing rules them out, so they stay.
KDR740ULSchottky diode, KECSchottky diodeNot recordedKEC
- What it is
- Schottky diode
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
KTA1535TPNP transistor, KECPNP transistorNot recordedKEC
- What it is
- PNP transistor
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
PG15GSUSCESD protection diode, KECESD protection diodeNot recordedKEC
- What it is
- ESD protection diode
- Maker
- KEC
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
RQ5A030APP-channel MOSFET, ROHMP-channel MOSFETNot recordedROHM
- What it is
- P-channel MOSFET
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Pch -12V -3A Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
RV5A040APP-channel MOSFET, ROHMP-channel MOSFETNot recordedROHM
- What it is
- P-channel MOSFET
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Pch -12V -4.0A Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
SCN-2-27+RF power splitter, Mini-CircuitsRF power splitterNot recordedMini-Circuits
- What it is
- RF power splitter
- Maker
- Mini-Circuits
- Package
- Not recorded
- Pins
- Not recorded
- Details
- RF power splitter/combiner, 2225-2700 MHz
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: This part.
74LV1T87GVNXPNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input single supply translating EXCLUSIVE-NOR gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74LV1T87GWNXPNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input single supply translating EXCLUSIVE-NOR gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74LV1T87GXNXPNot recordedNot recordedNXP
- What it is
- Not recorded
- Maker
- NXP
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: 2-input single supply translating EXCLUSIVE-NOR gate
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
IXD5127C22GNRVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
- What it is
- Voltage supervisor
- Maker
- IXYS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.2V±0.8%, +Reset PPO, -MR, 100ms Rt delay
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
KTC4377NPN transistorNPN transistorNot recordedNot recorded
- What it is
- NPN transistor
- Maker
- Not recorded
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Published code list
Is it dead? The meter test is below: NPN 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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- A reading the wrong way round as well: leaky.
- Open both ways: failed open.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
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.
TVS or ESD protection diode
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
- From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
- A reading both ways on a one-way part: leaky.
- A one-way part open both ways: failed open.
- On the board
- , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
- Compare:
- The same part on the next line or connector pin is the healthy reading to compare with.
- Watch for:
- A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
P-channel MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
Red probe on the drain, black on the source: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.
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. Often all three pins end up shorted together.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, so gate to source reads that resistor, which 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.
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.
Printed with a code easy to misread as SD
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes not listed here are printed on 12 more parts.
Did you find your part?
Open this in the search to correct a character or try another package.