SMD code YQ 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.
7 parts in SOT-23 are printed YQ
Not sure which one you have?
Answer up to 4 quick questions and these 19 parts are ranked, with a meter test that settles it. It works on a dead part too.
2PD601QSOT-233 pins, NexperiaNot recorded3 pinsNexperia
- What it is
- Not recorded
- Maker
- Nexperia
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: GP, Sw, 60V, 100mA, 250mW, B=160..260, >100MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SD601-QSOT-233 pins, PanNot recorded3 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: GP, AF, 50V, 600mA, B=160..260, 150MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SD1484K-QSOT-23NPN transistor, 3 pins, ROHMNPN transistor3 pinsROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: AF-Drv, 50V, 500mA, 200mW, B=120..270, >250MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SD1484KQSOT-233 pins, ROHMNot recorded3 pinsROHM
- What it is
- Not recorded
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
DDZX7V5CSOT-23Zener diode, 3 pins, Diodes IncorporatedZener diode3 pinsDiodes Incorporated
- What it is
- Zener diode
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- Z-diode: 7,5V±2,5%, 500mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
RN2314SOT-23Digital transistor (PNP, resistors built in), 3 pins, ToshibaDigital transistor (PNP, resistors built in)3 pinsToshiba
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp-Digi: Sw, 50V, 100mA, 400mW, R1/R2=1k/10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
RN2414SOT-23Digital transistor (PNP, resistors built in), 3 pins, ToshibaDigital transistor (PNP, resistors built in)3 pinsToshiba
- What it is
- Digital transistor (PNP, resistors built in)
- Maker
- Toshiba
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp-Digi: Sw, 50V, 100mA, 400mW, R1/R2=1k/10k
- Source
- Published code list
Is it dead? The meter test is below: Digital transistor.
8 more parts have no package on record. Nothing rules them out, so they stay.
MCH6341-TL-WP-channel MOSFET, onsemiP-channel MOSFETNot recordedonsemi
- What it is
- P-channel MOSFET
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- MOSFET - Power, Single P-Channel
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
2PA1774JQ3 pins, NexperiaNot recorded3 pinsNexperia
- What it is
- Not recorded
- Maker
- Nexperia
- Package
- Not recorded
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
2PA1774QJNexperiaNot recordedNot recordedNexperia
- What it is
- Not recorded
- Maker
- Nexperia
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Si-pnp: LN, 50V, 100mA, 150mW, >100MHz, B=120..270
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SD874ANPN 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.
2SD1949NPN transistor, ROHMNPN transistorNot recordedROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
30C01CNPN transistor, Sanyo ElectricNPN transistorNot recordedSanyo Electric
- What it is
- NPN transistor
- Maker
- Sanyo Electric
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: AF, GP, 40V, 400mA, 300mW, B=300..600, 380MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
30C01MNPN transistor, Sanyo ElectricNPN transistorNot recordedSanyo Electric
- What it is
- NPN transistor
- Maker
- Sanyo Electric
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: AF, GP, 40V, 400mA, 300mW, B=300..600, 380MHz
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
30C01SNPN transistor, Sanyo ElectricNPN transistorNot recordedSanyo Electric
- What it is
- NPN transistor
- Maker
- Sanyo Electric
- Package
- Not recorded
- Pins
- Not recorded
- Details
- NPN transistor: AF, GP, 40V, 400mA, 200mW, B=300..600, 380MHz
- 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.
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.
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.
Zener diode
Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.
Working, it reads
About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- Open both ways, forward too: failed open.
- Holds well off its rated voltage on the supply test: drifted.
- A soft knee, or a voltage that creeps on the supply test: 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 meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
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.
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.
Printed with a code easy to misread as YQ
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.