SMD code -1K
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.
90 parts are printed -1K
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.
BC848BDW-Q1SOT-363Dual NPN transistor, 6 pins, Formosa MicrosemiDual NPN transistorSOT-3636 pinsFormosa Microsemi
- What it is
- Dual NPN transistor
- Maker
- Formosa Microsemi
- Package
- SOT-363
- Pins
- 6
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor pair.
BC848BLSOT-23NPN transistor, 3 pins, onsemiNPN transistorSOT-233 pinsonsemi
- What it is
- NPN transistor
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- General Purpose Transistors Series
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BC848BQSOT-23NPN transistor, 3 pins, Yangjie Electronic TechNPN transistorSOT-233 pinsYangjie Electronic Tech
- What it is
- NPN transistor
- Maker
- Yangjie Electronic Tech
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BC848BWSOT-323Transistor, 3 pins, DiotecTransistorSOT-3233 pinsDiotec
- What it is
- Transistor
- Maker
- Diotec
- Package
- SOT-323
- Pins
- 3
- Details
- SMD General Purpose NPN Transistors
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
BC848BW-HFSOT-323NPN transistor, 3 pins, ComchipNPN transistorSOT-3233 pinsComchip
- What it is
- NPN transistor
- Maker
- Comchip
- Package
- SOT-323
- Pins
- 3
- Details
- 30 V, 0.1 A NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BC848BW-Q1SOT-323NPN transistor, 3 pins, Formosa MicrosemiNPN transistorSOT-3233 pinsFormosa Microsemi
- What it is
- NPN transistor
- Maker
- Formosa Microsemi
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BC848BWQSOT-323NPN transistor, 3 pins, Yangjie Electronic TechNPN transistorSOT-3233 pinsYangjie Electronic Tech
- What it is
- NPN transistor
- Maker
- Yangjie Electronic Tech
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BCV61BSOT-143NPN transistor, 4 pins, InfineonNPN transistorSOT-1434 pinsInfineon
- What it is
- NPN transistor
- Maker
- Infineon
- Package
- SOT-143
- Pins
- 4
- Details
- 30V, 0.1A, Medium Power NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
DA221AMSOT-416Switching diode, 3 pins, ROHMSwitching diodeSOT-4163 pinsROHM
- What it is
- Switching diode
- Maker
- ROHM
- Package
- SOT-416
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
DA221AMFHSOT-416Switching diode, 3 pins, ROHMSwitching diodeSOT-4163 pinsROHM
- What it is
- Switching diode
- Maker
- ROHM
- Package
- SOT-416
- Pins
- 3
- Details
- Switching Diode (AEC-Q101 qualified)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
GSBC848BMSOT-883NPN transistor, 3 pins, Good-ArkNPN transistorSOT-8833 pinsGood-Ark
- What it is
- NPN transistor
- Maker
- Good-Ark
- Package
- SOT-883
- Pins
- 3
- Details
- NPN transistor, 30 V, 0.1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
GSBC8456BDESOT-563Complementary transistor pair (NPN and PNP), 6 pins, Good-ArkComplementary transistor pair (NPN and PNP)SOT-5636 pinsGood-Ark
- What it is
- Complementary transistor pair (NPN and PNP)
- Maker
- Good-Ark
- Package
- SOT-563
- Pins
- 6
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor pair.
GSBC8457BDESOT-563Complementary transistor pair (NPN and PNP), 6 pins, Good-ArkComplementary transistor pair (NPN and PNP)SOT-5636 pinsGood-Ark
- What it is
- Complementary transistor pair (NPN and PNP)
- Maker
- Good-Ark
- Package
- SOT-563
- Pins
- 6
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor pair.
GSBC8458BDESOT-563Complementary transistor pair (NPN and PNP), 6 pins, Good-ArkComplementary transistor pair (NPN and PNP)SOT-5636 pinsGood-Ark
- What it is
- Complementary transistor pair (NPN and PNP)
- Maker
- Good-Ark
- Package
- SOT-563
- Pins
- 6
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor pair.
HMM3Z4V3T1GSOD-323Zener diode, 2 pins, HXYZener diodeSOD-3232 pinsHXY
- What it is
- Zener diode
- Maker
- HXY
- Package
- SOD-323
- Pins
- 2
- Details
- Zener diode, 15 V
- Source
- Manufacturer datasheet
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.
NPN transistor pair
Diode range, part lifted. Test each transistor on its own pins, as the datasheet's pinout gives them.
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.
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.
Bipolar transistor
Diode range, part lifted or its base leg off the pad.
Working, it reads
From the base, one probe colour 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.
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.
Bipolar transistor pair
Diode range, part lifted. Test each transistor on its own pins, as the datasheet's pinout gives them.
Working, it reads
From the base, one probe colour 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.
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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