SMD code QJ-
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.
24 parts are printed QJ-
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.
QJL3SOT-223Rectifier, 4 pins, CYStekRectifierSOT-2234 pinsCYStek
- What it is
- Rectifier
- Maker
- CYStek
- Package
- SOT-223
- Pins
- 4
- Details
- snubber damping rectifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
RE1J002YNSOT-416N-channel MOSFET, 3 pins, ROHMN-channel MOSFETSOT-4163 pinsROHM
- What it is
- N-channel MOSFET
- Maker
- ROHM
- Package
- SOT-416
- Pins
- 3
- Details
- Nch 50V 200mA Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
RU1J002YNSOT-323N-channel MOSFET, 3 pins, ROHMN-channel MOSFETSOT-3233 pinsROHM
- What it is
- N-channel MOSFET
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Details
- Nch 50V 200mA Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
RYC002N05SOT-23N-channel MOSFET, 3 pins, ROHMN-channel MOSFETSOT-233 pinsROHM
- What it is
- N-channel MOSFET
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- Nch 50V 200mA Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
RYM002N05SOT-723N-channel MOSFET, 3 pins, ROHMN-channel MOSFETSOT-7233 pinsROHM
- What it is
- N-channel MOSFET
- Maker
- ROHM
- Package
- SOT-723
- Pins
- 3
- Details
- Nch 50V 200mA Small Signal MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
TLV70029DSEWSONLDO regulator, 6 pins, Texas InstrumentsLDO regulatorWSON6 pinsTexas Instruments
- What it is
- LDO regulator
- Maker
- Texas Instruments
- Package
- WSON
- Pins
- 6
- Details
- 200-mA, Low-IQ, Low-Dropout Regulator for Portable Devices
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
TPS7A2013DQNX2SONLDO regulator, 4 pins, Texas InstrumentsLDO regulatorX2SON4 pinsTexas Instruments
- What it is
- LDO regulator
- Maker
- Texas Instruments
- Package
- X2SON
- Pins
- 4
- Details
- 300mA, Ultra-Low-Noise, Low-IQ, High PSRR LDO
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
QJM3SOT-89Rectifier, 3 pins, CYStekRectifierSOT-893 pinsCYStek
- What it is
- Rectifier
- Maker
- CYStek
- Package
- SOT-89
- Pins
- 3
- Details
- snubber damping rectifier
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
APX810S00-26SA-7SOT-23Voltage supervisor, 3 pins, Diodes IncorporatedVoltage supervisorSOT-233 pinsDiodes Incorporated
- What it is
- Voltage supervisor
- Maker
- Diodes Incorporated
- Package
- SOT-23
- Pins
- 3
- Details
- Voltage detector IC: 2.63V±1.5%, +Reset PPO, Rdt=1.7ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
ELM7319NBC2ASOT-353Voltage supervisor, 5 pins, ELM TechnologyVoltage supervisorSOT-3535 pinsELM Technology
- What it is
- Voltage supervisor
- Maker
- ELM Technology
- Package
- SOT-353
- Pins
- 5
- Details
- Voltage detector IC: 1.9V±30mV, -Reset ODO, -MR
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MCP100T-270ISOT-23Voltage supervisor, 3 pins, MicrochipVoltage supervisorSOT-233 pinsMicrochip
- What it is
- Voltage supervisor
- Maker
- Microchip
- Package
- SOT-23
- Pins
- 3
- Details
- CMOS-IC: Voltage Detector 2,7V, -Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
MCP100T-270I/TTSOT-233 pins, MicrochipNot recordedSOT-233 pinsMicrochip
- What it is
- Not recorded
- Maker
- Microchip
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
3 more parts have no package on record
NCV8730BMTW180LDO regulator, onsemiLDO regulatorNot recordedNot recordedonsemi
- What it is
- LDO regulator
- Maker
- onsemi
- Package
- Not recorded
- Pins
- Not recorded
- Details
- LDO Regulator, 150 mA, 38 V, 1 A I , with PG
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Voltage regulator.
BD5328FVEVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 2,8V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD5328GVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 2,8V, Reset Push-pull output
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
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.
Voltage regulator
Voltage, board powered, black probe on ground. Then ohms with the power off.
Working, it reads
Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.
Dead, it reads
- Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
- Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
- Power off, input to output near 0 Ω: shorted.
- On the board:
- An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
- Compare:
- The same regulator on another rail or another board shows the right voltages and the right resistances.
- Watch for:
- Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
Silicon diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.
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: failed open.
- A reading the wrong way round as well: 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 three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.
A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.
N-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 source, black on the drain: 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. A drain short can be the load. 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.
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.
Printed with a code easy to misread as QJ-
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 5 more parts.
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