SMD code BS-
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.
117 parts are printed BS-
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.
2SB766A-SSOT-89PNP transistor, 3 pins, Galaxy MicroelectronicsPNP transistorSOT-893 pinsGalaxy Microelectronics
- What it is
- PNP transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-89
- Pins
- 3
- Details
- -50V, -1A, General Purpose PNP Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
2SC2412-SSOT-23NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-233 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-23
- Pins
- 3
- Details
- 50V, 0.15A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC2412KSOT-23NPN transistor, 3 pins, JSCJNPN transistorSOT-233 pinsJSCJ
- What it is
- NPN transistor
- Maker
- JSCJ
- Package
- SOT-23
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC2412KT146SSOT-23NPN transistor, 3 pins, HXYNPN transistorSOT-233 pinsHXY
- What it is
- NPN transistor
- Maker
- HXY
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor, 50 V, 0.15 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC4081-SSOT-323NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-3233 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-323
- Pins
- 3
- Details
- 50V, 0.15A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC4617-SSOT-523NPN transistor, 3 pins, Galaxy MicroelectronicsNPN transistorSOT-5233 pinsGalaxy Microelectronics
- What it is
- NPN transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-523
- Pins
- 3
- Details
- 50V, 0.1A, General Purpose NPN Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC5658SOT-723NPN transistor, 3 pins, JSCJNPN transistorSOT-7233 pinsJSCJ
- What it is
- NPN transistor
- Maker
- JSCJ
- Package
- SOT-723
- Pins
- 3
- Details
- Bipolar transistor, 50 V, 0.15 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC5658M-SSOT-723Transistor, 3 pins, YFWTransistorSOT-7233 pinsYFW
- What it is
- Transistor
- Maker
- YFW
- Package
- SOT-723
- Pins
- 3
- Details
- Bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
2SC5658SSOT-723NPN transistor, 3 pins, HXYNPN transistorSOT-7233 pinsHXY
- What it is
- NPN transistor
- Maker
- HXY
- Package
- SOT-723
- Pins
- 3
- Details
- Bipolar transistor, 50 V, 0.15 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC5658S-HFSOT-723NPN transistor, 3 pins, ComchipNPN transistorSOT-7233 pinsComchip
- What it is
- NPN transistor
- Maker
- Comchip
- Package
- SOT-723
- Pins
- 3
- Details
- 50 V, 0.15 A NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
2SC5658T2LSSOT-723NPN transistor, 3 pins, HXYNPN transistorSOT-7233 pinsHXY
- What it is
- NPN transistor
- Maker
- HXY
- Package
- SOT-723
- Pins
- 3
- Details
- Bipolar transistor, 50 V, 0.15 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
AO3453SOT-23P-channel MOSFET, 3 pins, Alpha & Omega SemiconductorP-channel MOSFETSOT-233 pinsAlpha & Omega Semiconductor
- What it is
- P-channel MOSFET
- Maker
- Alpha & Omega Semiconductor
- Package
- SOT-23
- Pins
- 3
- Details
- P-channel MOSFET (8-60 V)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: P-channel MOSFET.
BCM856BSSOT-363PNP transistor, 6 pins, NexperiaPNP transistorSOT-3636 pinsNexperia
- What it is
- PNP transistor
- Maker
- Nexperia
- Package
- SOT-363
- Pins
- 6
- Details
- 65 V, 100 mA PNP/PNP matched double transistors
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
BSS670S2LSOT-23N-channel MOSFET, 3 pins, InfineonN-channel MOSFETSOT-233 pinsInfineon
- What it is
- N-channel MOSFET
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Details
- N-Channel Small Signal MOSFET 55 V in SOT-23 package
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: N-channel MOSFET.
1 more part has no package on record
BGA615L7RF amplifier (MMIC), InfineonRF amplifier (MMIC)Not recordedNot recordedInfineon
- What it is
- RF amplifier (MMIC)
- Maker
- Infineon
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: RF amplifier.
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.
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.
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.
P-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 drain, black on the source: 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. 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.
RF amplifier
Voltage, board powered, on the output pin that the bias resistor or choke feeds.
Working, it reads
The output pin sits at the device voltage the datasheet gives, a few volts, below the supply.
Dead, it reads
- Output pin at 0 V, or near 0 Ω to ground with the power off: shorted inside.
- Output pin at the full supply voltage: open inside, no current flowing.
- On the board:
- Measured on the board with power on; the bias network is part of the reading.
- 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 figures depend on the part and its bias resistor. The datasheet gives both.
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.
Printed with a code easy to misread as BS-
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 9 more parts.
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