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.
HBN2444S6RSOT-363Dual NPN transistor, 6 pins, CYStekDual NPN transistorSOT-3636 pinsCYStek
- What it is
- Dual NPN transistor
- Maker
- CYStek
- Package
- SOT-363
- Pins
- 6
- Details
- 25 V, 0.8 A dual NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor pair.
HBN2515S6RSOT-363Dual NPN transistor, 6 pins, CYStekDual NPN transistorSOT-3636 pinsCYStek
- What it is
- Dual NPN transistor
- Maker
- CYStek
- Package
- SOT-363
- Pins
- 6
- Details
- 15 V, 0.8 A dual NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor pair.
WS18DF-BSOD-882ESD protection diode, 2 pins, WayonESD protection diodeSOD-8822 pinsWayon
- What it is
- ESD protection diode
- Maker
- Wayon
- Package
- SOD-882
- Pins
- 2
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
2PB709ASSOT-233 pins, NexperiaNot recordedSOT-233 pinsNexperia
- What it is
- Not recorded
- Maker
- Nexperia
- Package
- SOT-23
- Pins
- 3
- Details
- pnp 45V 0.1A hfe 290-460
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SA1669SOT-233 pins, Sanyo ElectricNot recordedSOT-233 pinsSanyo Electric
- What it is
- Not recorded
- Maker
- Sanyo Electric
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: UHF, 20V, 50mA, 200mW, B>15, 3GHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB709A-SSOT-233 pins, PanasonicNot recordedSOT-233 pinsPanasonic
- What it is
- Not recorded
- Maker
- Panasonic
- Package
- SOT-23
- Pins
- 3
- Details
- Si-pnp: GP, AF, 60V, 600mA, B=290..460, 150MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB709ASSOT-233 pins, Panasonic (Matsushita Electric Industrial Co.Not recordedSOT-233 pinsPanasonic (Matsushita Electric Industrial Co.
- What it is
- Not recorded
- Maker
- Panasonic (Matsushita Electric Industrial Co.
- Package
- SOT-23
- Pins
- 3
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB766ASOT-89PNP transistor, 3 pins, Galaxy MicroelectronicsPNP transistorSOT-893 pinsGalaxy Microelectronics
- What it is
- PNP transistor
- Maker
- Galaxy Microelectronics
- Package
- SOT-89
- Pins
- 3
- Details
- PNP bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SB0766A-SSOT-89PNP transistor, 3 pins, PanasonicPNP transistorSOT-893 pinsPanasonic
- What it is
- PNP transistor
- Maker
- Panasonic
- Package
- SOT-89
- Pins
- 3
- Details
- PNP transistor: AF, 60V, 1A, 1W, B=170..340, 200MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SB766ASQ-SSOT-89PNP transistor, 3 pins, Dongguan Pingjingsemi TechnologyPNP transistorSOT-893 pinsDongguan Pingjingsemi Technology
- What it is
- PNP transistor
- Maker
- Dongguan Pingjingsemi Technology
- Package
- SOT-89
- Pins
- 3
- Details
- PNP transistor: Lo-sat, 60V, 1A, 500mW, B=170..340, 200MHz
- Source
- Published code list
Is it dead? The meter test is below: PNP transistor.
2SB1218A-SSOT-3233 pins, PanNot recordedSOT-3233 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-323
- Pins
- 3
- Details
- Si-pnp: AF, 45V, 100mA, 150mW, B=290..460, >80MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SB1627-SSOT-4163 pins, PanNot recordedSOT-4163 pinsPan
- What it is
- Not recorded
- Maker
- Pan
- Package
- SOT-416
- Pins
- 3
- Details
- Si-pnp: Lo-sat, 45V, 100mA, 80MHz, B=170..340
- Source
- Published code list
Is it dead? The meter test is below: This part.
2SC2412K-SSOT-23NPN transistor, 3 pins, ROHMNPN transistorSOT-233 pinsROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- Si-npn: GP, 60V, 150mA, 200mW, 180MHz, B=270..560
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
2SC4081SOT-23NPN transistor, 3 pins, ROHMNPN transistorSOT-233 pinsROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- SOT-23
- Pins
- 3
- Details
- NPN bipolar transistor
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
1 more part has no package on record
2SC4081UBNPN transistor, ROHMNPN transistorNot recordedNot recordedROHM
- What it is
- NPN transistor
- Maker
- ROHM
- Package
- Not recorded
- Pins
- Not recorded
- Source
- Published code list
Is it dead? The meter test is below: NPN transistor.
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.
TVS or ESD protection diode
Diode range, from the protected line to ground, part lifted if you can.
Working, it reads
A one-way part reads about 0.6 to 0.8 V forward and open in reverse. A two-way part reads open both ways. Arrays with several lines read as the datasheet's diagram draws them.
Dead, it reads
- From the line to ground, the same reading both ways, near 0 V with a continuous beep: shorted.
- A reading both ways on a one-way part: leaky.
- A one-way part open both ways: failed open.
- On the board
- , a line reading shorted to ground can be this part or anything else on that line. Lift it: if the short goes with it, it has failed.
- Compare:
- The same part on the next line or connector pin is the healthy reading to compare with.
- Watch for:
- A two-way part reads open both ways when it is good, exactly like one that has failed open. The meter cannot tell them apart; an identical part on the next line can.
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.
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.
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