SMD code HHQ
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.
10 parts are printed HHQ
Not sure which one you have?
Answer up to 4 quick questions and these 10 parts are ranked, with a meter test that settles it. It works on a dead part too.
2SA1036KSOT-23PNP transistor, 3 pins, Blue RocketPNP transistorSOT-233 pinsBlue Rocket
- What it is
- PNP transistor
- Maker
- Blue Rocket
- Package
- SOT-23
- Pins
- 3
- Details
- PNP bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
2SA1577WSOT-323PNP transistor, 3 pins, Blue RocketPNP transistorSOT-3233 pinsBlue Rocket
- What it is
- PNP transistor
- Maker
- Blue Rocket
- Package
- SOT-323
- Pins
- 3
- Details
- PNP bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
2SA1036K-QSOT-233 pins, Foshan Blue Rocket ElectronicsNot recordedSOT-233 pinsFoshan Blue Rocket Electronics
- What it is
- Not recorded
- Maker
- Foshan Blue Rocket Electronics
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: GP, 40V, 500mA, 200mW, B=120..270, 200MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA1577W-QSOT-323PNP transistor, 3 pins, Foshan Blue Rocket ElectronicsPNP transistorSOT-3233 pinsFoshan Blue Rocket Electronics
- What it is
- PNP transistor
- Maker
- Foshan Blue Rocket Electronics
- Package
- SOT-323
- Pins
- 3
- Details
- PNP transistor: GP, AF, 40V, 500mA, 200mW, B=120..270, 200MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
3.0GSMDJ170SMCTVS diode, 2 pins, Good-ArkTVS diodeSMC2 pinsGood-Ark
- What it is
- TVS diode
- Maker
- Good-Ark
- Package
- SMC
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=170V, Vbr=189..239.5V, Ipp=9.9A, 3000W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
3.0SMCJ170SMCTVS diode, 2 pins, PanjitTVS diodeSMC2 pinsPanjit
- What it is
- TVS diode
- Maker
- Panjit
- Package
- SMC
- Pins
- 2
- Details
- TVS: 170V, 9.8A, 3000W (1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
3.0SMI170SMCTVS diode, 2 pins, SMC Diode SolutionsTVS diodeSMC2 pinsSMC Diode Solutions
- What it is
- TVS diode
- Maker
- SMC Diode Solutions
- Package
- SMC
- Pins
- 2
- Details
- Transient voltage supressor: Vbr=189..239.5V, Vrwm=170V, 9.8A, 3000W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
SMLJ170SMCTVS diode, 2 pins, Micro Commercial ComponentsTVS diodeSMC2 pinsMicro Commercial Components
- What it is
- TVS diode
- Maker
- Micro Commercial Components
- Package
- SMC
- Pins
- 2
- Details
- TVS: 170V, 9.8A, 3000W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV30C171KSMC2 pins, ComchipNot recordedSMC2 pinsComchip
- What it is
- Not recorded
- Maker
- Comchip
- Package
- SMC
- Pins
- 2
- Details
- TVS: 170V, 10%, 9.8A, 3000W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
TV30C171K-GSMCTVS diode, 2 pins, ComchipTVS diodeSMC2 pinsComchip
- What it is
- TVS diode
- Maker
- Comchip
- Package
- SMC
- Pins
- 2
- Details
- Transient voltage supressor: Vrwm=170.0V, Vbr=189.0..231.0V, Ipp=9.87A, 3000W(1ms)
- Source
- Published code list
Is it dead? The meter test is below: TVS or ESD protection diode.
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.
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.
Printed with a code easy to misread as HHQ
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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