SMD code 1Bs in SOT-323
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, s, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and 1B was searched.
16 parts in SOT-323 are printed 1Bs
Not sure which one you have?
Answer up to 4 quick questions and these 47 parts are ranked, with a meter test that settles it. It works on a dead part too.
all SOT-323, 3 pins. What differs:
ABC846BW-HFSOT-323NPN transistor, ComchipNPN transistorComchip
- What it is
- NPN transistor
- Maker
- Comchip
- Package
- SOT-323
- Pins
- 3
- Details
- 65 V, 0.1 A NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BC846BWSOT-323Transistor, DiotecTransistorDiotec
- What it is
- Transistor
- Maker
- Diotec
- Package
- SOT-323
- Pins
- 3
- Pinout
- 1 base
- 2 emitter
- 3 collector
- Details
- SMD General Purpose NPN Transistors
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
BC846BW-HFSOT-323NPN transistor, ComchipNPN transistorComchip
- What it is
- NPN transistor
- Maker
- Comchip
- Package
- SOT-323
- Pins
- 3
- Details
- 65 V, 0.1 A NPN transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BC846BW-Q1SOT-323NPN transistor, Formosa MicrosemiNPN transistorFormosa 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.
BC846BWHSOT-323NPN transistor, Taiwan SemiconductorNPN transistorTaiwan Semiconductor
- What it is
- NPN transistor
- Maker
- Taiwan Semiconductor
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BC846BWQSOT-323NPN transistor, Yangjie Electronic TechNPN transistorYangjie 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.
DAP202FMSOT-323Switching diode, ROHMSwitching diodeROHM
- What it is
- Switching diode
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Details
- Switching Diode (High speed switching)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
DAP202FMFHSOT-323Switching diode, ROHMSwitching diodeROHM
- What it is
- Switching diode
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Details
- Switching Diode (High speed switching) (AEC-Q101 qualified)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
DAP202UMSOT-323Switching diode, ROHMSwitching diodeROHM
- What it is
- Switching diode
- Maker
- ROHM
- Package
- SOT-323
- Pins
- 3
- Details
- Switching Diode (High speed switching)
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Silicon diode.
LBC846BWT1GSOT-323NPN transistor, LRCNPN transistorLRC
- What it is
- NPN transistor
- Maker
- LRC
- Package
- SOT-323
- Pins
- 3
- Details
- Bipolar transistor, NPN, IC 100 mA, VCEO 65 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
S-LBC846BWT1GSOT-323NPN transistor, LRCNPN transistorLRC
- What it is
- NPN transistor
- Maker
- LRC
- Package
- SOT-323
- Pins
- 3
- Details
- Bipolar transistor, NPN, IC 100 mA, VCEO 65 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
S-LBC846BWT1G-SSOT-323NPN transistor, LRCNPN transistorLRC
- What it is
- NPN transistor
- Maker
- LRC
- Package
- SOT-323
- Pins
- 3
- Details
- Bipolar transistor, NPN, IC 100 mA, VCEO 65 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
S-LBCT846BWT1GSOT-323NPN transistor, LRCNPN transistorLRC
- What it is
- NPN transistor
- Maker
- LRC
- Package
- SOT-323
- Pins
- 3
- Details
- Bipolar transistor, NPN, IC 100 mA, VCEO 65 V
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
SBC846BWSOT-323NPN transistor, onsemiNPN transistoronsemi
- What it is
- NPN transistor
- Maker
- onsemi
- Package
- SOT-323
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: NPN transistor.
BC846BW(T1)SOT-323KECNot recordedKEC
- What it is
- Not recorded
- Maker
- KEC
- Package
- SOT-323
- Pins
- 3
- Details
- Si-npn: GP, 80V, 100mA, 250mW, B=200..450, >100MHz
- Source
- Published code list
Is it dead? The meter test is below: This part.
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.
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.
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.
Printed with a code easy to misread as 1Bs
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 71 more parts.
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