SMD code 3Bp
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, p, is lower case, which on NXP and Philips parts is a date or factory code, so it was set aside and 3B was searched.
140 parts are printed 3Bp
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.
3KASMC16ASMCTVS diode, 2 pins, VishayTVS diodeSMC2 pinsVishay
- What it is
- TVS diode
- Maker
- Vishay
- Package
- SMC
- Pins
- 2
- Details
- 3000 W TVS diode, unidirectional
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: TVS or ESD protection diode.
ABC856B-HFSOT-23PNP transistor, 3 pins, ComchipPNP transistorSOT-233 pinsComchip
- What it is
- PNP transistor
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- -65 V, -0.1 A PNP transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
ABC856BW-HFSOT-323PNP transistor, 3 pins, ComchipPNP transistorSOT-3233 pinsComchip
- What it is
- PNP transistor
- Maker
- Comchip
- Package
- SOT-323
- Pins
- 3
- Details
- -65 V, -0.1 A PNP transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
ARB520S-40-HFSOD-523Schottky diode, 2 pins, ComchipSchottky diodeSOD-5232 pinsComchip
- What it is
- Schottky diode
- Maker
- Comchip
- Package
- SOD-523
- Pins
- 2
- Details
- 40 V, 0.2 A Schottky barrier diode
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
BC856SOT-23PNP transistor, 3 pins, KECPNP transistorSOT-233 pinsKEC
- What it is
- PNP transistor
- Maker
- KEC
- Package
- SOT-23
- Pins
- 3
- Details
- PNP bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
BC856BSOT-23PNP transistor, 3 pins, InfineonPNP transistorSOT-233 pinsInfineon
- What it is
- PNP transistor
- Maker
- Infineon
- Package
- SOT-23
- Pins
- 3
- Pinout
- 1 base
- 2 emitter
- 3 collector
- Details
- -80 V PNP small-signal transistor, gain group B
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
BC856B-CSOT-23Transistor, 3 pins, SeCoSTransistorSOT-233 pinsSeCoS
- What it is
- Transistor
- Maker
- SeCoS
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: Bipolar transistor.
BC856B-HFSOT-23PNP transistor, 3 pins, ComchipPNP transistorSOT-233 pinsComchip
- What it is
- PNP transistor
- Maker
- Comchip
- Package
- SOT-23
- Pins
- 3
- Details
- -65 V, -0.1 A PNP transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
BC856B,215SOT-23PNP transistor, 3 pins, HXYPNP transistorSOT-233 pinsHXY
- What it is
- PNP transistor
- Maker
- HXY
- Package
- SOT-23
- Pins
- 3
- Details
- Bipolar transistor, 65 V, 0.1 A
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
BC856BDWSOT-363Dual PNP transistor, 6 pins, Formosa MicrosemiDual PNP transistorSOT-3636 pinsFormosa Microsemi
- What it is
- Dual PNP transistor
- Maker
- Formosa Microsemi
- Package
- SOT-363
- Pins
- 6
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor pair.
BC856BDW-Q1SOT-363Dual PNP transistor, 6 pins, Formosa MicrosemiDual PNP transistorSOT-3636 pinsFormosa Microsemi
- What it is
- Dual PNP transistor
- Maker
- Formosa Microsemi
- Package
- SOT-363
- Pins
- 6
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor pair.
BC856BDW1SOT-363Dual PNP transistor, 6 pins, onsemiDual PNP transistorSOT-3636 pinsonsemi
- What it is
- Dual PNP transistor
- Maker
- onsemi
- Package
- SOT-363
- Pins
- 6
- Details
- Dual General Purpose Transistors Series, Series, Series
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor pair.
BC856BHSOT-23PNP transistor, 3 pins, Taiwan SemiconductorPNP transistorSOT-233 pinsTaiwan Semiconductor
- What it is
- PNP transistor
- Maker
- Taiwan Semiconductor
- Package
- SOT-23
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
BC856BLSOT-23PNP transistor, 3 pins, onsemiPNP transistorSOT-233 pinsonsemi
- What it is
- PNP transistor
- Maker
- onsemi
- Package
- SOT-23
- Pins
- 3
- Details
- 65V, 0.1A, General Purpose PNP Bipolar Transistor
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP transistor.
BC856BM3SOT-723PNP transistor, 3 pins, onsemiPNP transistorSOT-7233 pinsonsemi
- What it is
- PNP transistor
- Maker
- onsemi
- Package
- SOT-723
- Pins
- 3
- Source
- Manufacturer datasheet
Is it dead? The meter test is below: PNP 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.
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.
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.
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
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.
PNP transistor pair
Diode range, part lifted. Test each transistor on its own pins, as the datasheet's pinout gives them.
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.
Printed with a code easy to misread as 3Bp
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 2 more parts.
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