SMD code 1Jt
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.
The last letter, t, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and 1J was searched.
71 parts are printed 1Jt
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.
BC848AQSOT-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.
BC848AWSOT-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.
BC848AW-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.
BC848AW-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.
BC848AWQSOT-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.
BCV61ASOT-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.
FM1200-NSOD-323Schottky diode, 2 pins, Formosa MicrosemiSchottky diodeSOD-3232 pinsFormosa Microsemi
- What it is
- Schottky diode
- Maker
- Formosa Microsemi
- Package
- SOD-323
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
FM1200-N-Q1SOD-323Schottky diode, 2 pins, Formosa MicrosemiSchottky diodeSOD-3232 pinsFormosa Microsemi
- What it is
- Schottky diode
- Maker
- Formosa Microsemi
- Package
- SOD-323
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
GSBC848AMSOT-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.
GSBC8456ADESOT-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.
GSBC8457ADESOT-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.
GSBC8458ADESOT-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.
GSMMBT2369SOT-23NPN transistor, 3 pins, Good-ArkNPN transistorSOT-233 pinsGood-Ark
- What it is
- NPN transistor
- Maker
- Good-Ark
- Package
- SOT-23
- Pins
- 3
- Details
- NPN transistor, 15 V, 0.2 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
GSMMBT2369ASOT-23NPN transistor, 3 pins, Good-ArkNPN transistorSOT-233 pinsGood-Ark
- What it is
- NPN transistor
- Maker
- Good-Ark
- Package
- SOT-23
- Pins
- 3
- Details
- NPN transistor, 15 V, 0.2 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
1 more part has no package on record
EMB20N03VATN-channel MOSFET, Excelliance MOSN-channel MOSFETNot recordedNot recordedExcelliance MOS
- What it is
- N-channel MOSFET
- Maker
- Excelliance MOS
- Package
- Not recorded
- Pins
- Not recorded
- Details
- 30 V, 7 A N-channel MOSFET
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
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.
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.
Schottky diode
Diode range, part lifted or one leg off the pad. Red probe on the anode.
Working, it reads
About 0.15 to 0.45 V anode to cathode, roughly half a silicon diode, and open the other way.
Dead, it reads
- The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
- A reading the wrong way round as well: leaky.
- Open both ways: failed open.
- 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 large Schottky can read about 0.1 V forward and beep like a short, and leaks a little the wrong way when good, more when warm. It is shorted only if it reads the same both ways. Measure it cold, beside an identical cold one.
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.
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