SMD code DKQ
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 are printed DKQ
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.
2SC4672-QSOT-89NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-893 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-89
- Pins
- 3
- Details
- 50V, 2A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BRSMBJ60CAQSMBTVS diode, 2 pins, Blue RocketTVS diodeSMB2 pinsBlue Rocket
- What it is
- TVS diode
- Maker
- Blue Rocket
- Package
- SMB
- Pins
- 2
- Details
- TVS diode, unidirectional
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
BRSMF60AQSOD-123FTVS diode, 2 pins, Blue RocketTVS diodeSOD-123F2 pinsBlue Rocket
- What it is
- TVS diode
- Maker
- Blue Rocket
- Package
- SOD-123F
- Pins
- 2
- Details
- TVS diode, unidirectional
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
F2SC4672QSOT-89NPN transistor, 3 pins, Formosa MicrosemiNPN transistorSOT-893 pinsFormosa Microsemi
- What it is
- NPN transistor
- Maker
- Formosa Microsemi
- Package
- SOT-89
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC2881SOT-89NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-893 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-89
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC4672SOT-89NPN transistor, 3 pins, ROHMNPN transistorSOT-893 pinsROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- SOT-89
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC4672U-QSOT-89NPN transistor, 3 pins, Huixin Electronic TechNPN transistorSOT-893 pinsHuixin Electronic Tech
- What it is
- NPN transistor
- Maker
- Huixin Electronic Tech
- Package
- SOT-89
- Pins
- 3
- Details
- NPN transistor: AF-Drv, 60V, 3A, 500mW, B=120..270, 210MHz
- 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.
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 DKQ
One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.
Codes that begin with DKQ
For a marking with its end worn or burnt off. Each code has a page of its own.
Codes not listed here are printed on 1 more part.
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