SMD code UN-
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.
50 parts are printed UN-
Not sure which one you have?
Answer up to 4 quick questions and these 50 parts are ranked, with a meter test that settles it. It works on a dead part too.
TPS3895ADRYSONVoltage supervisor, 6 pins, Texas InstrumentsVoltage supervisorSON6 pinsTexas Instruments
- What it is
- Voltage supervisor
- Maker
- Texas Instruments
- Package
- SON
- Pins
- 6
- Details
- Single-Channel, Adjustable Voltage Monitor in Ultra-Small Package
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Integrated circuit.
2SA2071SOT-89PNP transistor, 3 pins, ROHMPNP transistorSOT-893 pinsROHM
- What it is
- PNP transistor
- Maker
- ROHM
- Package
- SOT-89
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
3SK240SOT-1434 pins, ToshibaNot recordedSOT-1434 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-143
- Pins
- 4
- Details
- n-FET-d: GaAs, 2-Gate, UHF, 9V, Idss=6..20mA
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
3SK274SOT-1434 pins, ToshibaNot recordedSOT-1434 pinsToshiba
- What it is
- Not recorded
- Maker
- Toshiba
- Package
- SOT-143
- Pins
- 4
- Details
- n-FET: GaAs, 2-Gate, UHF, RF-Amp, 9V, Idss=6..20mA, 100mW, 19ms
- Source
- Published code list
Is it dead? The meter test is below: MOSFET.
74LVC1G07SESOT-3535 pins, Diodes IncorporatedNot recordedSOT-3535 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-353
- Pins
- 5
- Details
- CMOS logic IC: Noninverting buffer/driver (ODO)
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74LVC1G07W5SOT-23-55 pins, Diodes IncorporatedNot recordedSOT-23-55 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-23-5
- Pins
- 5
- Details
- CMOS logic IC: Noninverting buffer/driver (ODO)
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74LVC1G07ZSOT-5535 pins, Diodes IncorporatedNot recordedSOT-5535 pinsDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- SOT-553
- Pins
- 5
- Details
- CMOS logic IC: Noninverting buffer/driver (ODO)
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
8 more parts have no package on record
74LVC1G07FW4Diodes IncorporatedNot recordedNot recordedNot recordedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Noninverting buffer/driver (ODO)
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
74LVC1G07FZ4Diodes IncorporatedNot recordedNot recordedNot recordedDiodes Incorporated
- What it is
- Not recorded
- Maker
- Diodes Incorporated
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS logic IC: Noninverting buffer/driver (ODO)
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD45E295G-MVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Voltage detector IC: 2.9V±1%, -MR, -Reset ODO, Rdt=50ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
BD45442GVoltage supervisor, ROHMVoltage supervisorNot recordedNot recordedROHM
- What it is
- Voltage supervisor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Details
- CMOS-IC: Voltage Detector 4,4V, -Reset Open drain output, 200ms
- Source
- Published code list
Is it dead? The meter test is below: Integrated circuit.
CZRER13VB-HZener diode, ComchipZener diodeNot recordedNot recordedComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 12.68 13.32V, Zzt=25, Izt=5mA, 150mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CZRF13VBZener diode, ComchipZener diodeNot recordedNot recordedComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 12.68..13.32V, Izt=5mA, Zzt=25, 200mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CZRQR13VBZener diode, ComchipZener diodeNot recordedNot recordedComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 12.68..13.32V, Izt=5mA, Zzt=25, 125mW
- Source
- Published code list
Is it dead? The meter test is below: Zener diode.
CZRU13VBZener diode, ComchipZener diodeNot recordedNot recordedComchip
- What it is
- Zener diode
- Maker
- Comchip
- Package
- Not recorded
- Pins
- Not recorded
- Details
- Zener diode: 12.68..13.32V, Izt=5mA, Zzt=25, 150mW
- Source
- Published code list
Is it dead? The meter test is below: Zener 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.
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.
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.
MOSFET
Diode range, part lifted. Test drain to source first, then short gate to source and test again.
Working, it reads
One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.
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.
- No body diode at all: failed open.
- On the board
- the gate usually has a resistor to the source, which reads as that resistor and 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.
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.
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