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SMD code 5Bs in SOT-23-6

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 5B was searched.

7 parts in SOT-23-6 are printed 5Bs

Not sure which one you have?

Answer up to 4 quick questions and these 45 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • BC807-25-6LSOT-23-6PNP transistor, Galaxy MicroelectronicsPNP transistorSOT-23-6Galaxy Microelectronics
    What it is
    PNP transistor
    Maker
    Galaxy Microelectronics
    Package
    SOT-23-6
    Pins
    6
    Details
    45V, 0.5A, General Purpose PNP Bipolar Transistor
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: PNP transistor.

    Datasheetfor BC807-25-6L, opens in a new tab
  • LBC807-25DMT1GSOT-23-6PNP transistor, LRCPNP transistorSOT-23-6LRC
    What it is
    PNP transistor
    Maker
    LRC
    Package
    SOT-23-6
    Pins
    6
    Details
    Bipolar transistor, PNP, IC 500 mA, VCEO 45 V
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: PNP transistor.

    Datasheetfor LBC807-25DMT1G, opens in a new tab
  • TBC807-25-6LSOT-23-6PNP transistor, Galaxy MicroelectronicsPNP transistorSOT-23-6Galaxy Microelectronics
    What it is
    PNP transistor
    Maker
    Galaxy Microelectronics
    Package
    SOT-23-6
    Pins
    6
    Details
    45V, 0.5A, General Purpose PNP Bipolar Transistor
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: PNP transistor.

    Datasheetfor TBC807-25-6L, opens in a new tab
  • BC807F-25SOT-23-6Transistor, YFWTransistorSOT-23-6YFW
    What it is
    Transistor
    Maker
    YFW
    Package
    SOT-23-6
    Pins
    6
    Details
    Bipolar transistor
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: Bipolar transistor.

    Datasheetfor BC807F-25, opens in a new tab
  • BC807-25USOT-23-6InfineonNot recordedSOT-23-6Infineon
    What it is
    Not recorded
    Maker
    Infineon
    Package
    SOT-23-6
    Pins
    6
    Details
    dual BC327-25
    Source
    Published code list

    Is it dead? The meter test is below: This part.

  • R5106N161ASOT-23-6Voltage supervisor, RicohVoltage supervisorSOT-23-6Ricoh
    What it is
    Voltage supervisor
    Maker
    Ricoh
    Package
    SOT-23-6
    Pins
    6
    Details
    Voltage detector IC: 1.6V±1%, -Reset ODO, Inhibit
    Source
    Published code list

    Is it dead? The meter test is below: Integrated circuit.

  • BC807USOT-363PNP transistor, InfineonPNP transistorSOT-363Infineon
    What it is
    PNP transistor
    Maker
    Infineon
    Package
    SOT-363
    Pins
    6
    Details
    Bipolar transistor, PNP
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: PNP transistor.

    Datasheetfor BC807U, opens in a new tab
  • 8 more parts have no package on record. Nothing rules them out, so they stay.

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.

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.

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.

Integrated circuit

Voltage with the board powered; ohms from each pin to ground with it off.

Working, it reads

Supply pin at its voltage and the output doing what the datasheet says. Readings between pins depend on the part.

Dead, it reads

  • A pin near 0 Ω to ground or to the supply pin where an identical part does not read that: failed short.
  • Supply present, output stuck: failed, or its load has.
On the board:
A pin shorted to ground on the board can be anything on that net. Lift the pin to be sure.
Compare:
The surest reference is the same IC on a working board, measured pin by pin.
Watch for:
Its protection diodes can read like junctions between pins, even like a transistor. That proves nothing either way.

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.

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.

Printed with a code easy to misread as 5Bs

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 31 more parts.

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