SMD code BT2

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.

8 parts are printed BT2

Not sure which one you have?

Answer up to 4 quick questions and these 8 parts are ranked, with a meter test that settles it. It works on a dead part too.

BAT43BGPSOD-123Schottky diode, 2 pins, ChenmkoSchottky diodeSOD-1232 pinsChenmko
What it is
Schottky diode
Maker
Chenmko
Package
SOD-123
Pins
2
Details
SCHOTTKY DIODE, 30 V, 0.2 A
Source
Manufacturer datasheet
Is it dead? The meter test is below: Schottky diode.
Datasheetfor BAT43BGP, opens in a new tab
BAT43BPTSOD-1232 pins, Chenmko EnterpriseNot recordedSOD-1232 pinsChenmko Enterprise
What it is
Not recorded
Maker
Chenmko Enterprise
Package
SOD-123
Pins
2
Details
Diode: SBD, 30V, 200mA, Vf<1V(200mA), 5ns
Source
Published code list
Is it dead? The meter test is below: Silicon diode.
BSP16SOT-223PhiNot recordedSOT-223Not recordedPhi
What it is
Not recorded
Maker
Phi
Package
SOT-223
Pins
Not recorded
Details
Si-pnp: AF, Sw, Vid, 350V, 200mA, 1,2W, B=30..120, >15MHz
Source
Published code list
Is it dead? The meter test is below: This part.
BSP16T1SOT-223PNP transistor, 4 pins, onsemiPNP transistorSOT-2234 pinsonsemi
What it is
PNP transistor
Maker
onsemi
Package
SOT-223
Pins
4
Details
PNP transistor: AF, Sw, Vid, 350V, 1A, 1.5W, B=30..120, >15MHz
Source
Published code list
Is it dead? The meter test is below: PNP transistor.
BST16SOT-893 pins, NexperiaNot recordedSOT-893 pinsNexperia
What it is
Not recorded
Maker
Nexperia
Package
SOT-89
Pins
3
Details
equivalent 2N5416
Source
Published code list
Is it dead? The meter test is below: This part.
XC6115F533MRSOT-23-5Voltage supervisor, 5 pins, TorexVoltage supervisorSOT-23-55 pinsTorex
What it is
Voltage supervisor
Maker
Torex
Package
SOT-23-5
Pins
5
Details
CMOS-IC: VDet 3.3V, +Rst PPO, -Rst ODO, Wt=400ms, Rt=400ms
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
XC9261B32CER-GUSP-6CDC-DC converter, 6 pins, TorexDC-DC converterUSP-6C6 pinsTorex
What it is
DC-DC converter
Maker
Torex
Package
USP-6C
Pins
6
Details
DC/DC voltage converter IC: PWM/PFM st-dwn, 3.2V±2%, 1.5A, 1.2MHz, +CE, CL
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.
XC9261B32CPR-GSOT-89-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-89-55 pinsTorex
What it is
DC-DC converter
Maker
Torex
Package
SOT-89-5
Pins
5
Details
DC/DC voltage converter IC: PW M/PFM st-dwn, 3.2V±2%, 1.5A, 1.2MHz, +CE, CL
Source
Published code list
Is it dead? The meter test is below: Integrated circuit.

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.

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.

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.

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.

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.

Printed with a code easy to misread as BT2

One character differs, and it is one that is easy to confuse under a lamp. Each code has a page of its own.

Codes that begin with BT2

For a marking with its end worn or burnt off. Each code has a page of its own.

Codes not listed here are printed on 4 more parts.

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