SMD code YQ in SMA
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.
6 parts in SMA are printed YQ
Not sure which one you have?
Answer up to 4 quick questions and these 18 parts are ranked, with a meter test that settles it. It works on a dead part too.
SMAJ40CSMATVS diode, 2 pins, DOWOTVS diode2 pinsDOWO
- What it is
- TVS diode
- Maker
- DOWO
- Package
- SMA
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
EC76SMAJ40CSMATVS diode, 2 pins, E-CMOSTVS diode2 pinsE-CMOS
- What it is
- TVS diode
- Maker
- E-CMOS
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=44.4..54.3V, Vrwm=40V, Ipp=5.6A, 400W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
P4SMAJ40CSMATVS diode, 2 pins, Shanghai Lunsure Electronic TechnologyTVS diode2 pinsShanghai Lunsure Electronic Technology
- What it is
- TVS diode
- Maker
- Shanghai Lunsure Electronic Technology
- Package
- SMA
- Pins
- 2
- Details
- TVS: 40V, 5.6A, 400W (1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMAJ440CGSMATVS diode, 2 pins, First SemiconductorTVS diode2 pinsFirst Semiconductor
- What it is
- TVS diode
- Maker
- First Semiconductor
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=440V, Vbr=489..602.8V, Ipp=0.5A, 400W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV04A400KBSMA2 pins, ComchipNot recorded2 pinsComchip
- What it is
- Not recorded
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- TVS: 40V, 10%, 5.6A, 400W(1ms), Bidirectional
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV04A400KB-GSMATVS diode, 2 pins, ComchipTVS diode2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMA
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=40.0V, Vbr=44.40..54.30V, Ipp=5.60A, 400W(1ms), Bidir.
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
9 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.
30C01SSNPN 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.
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.
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.
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.
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