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SMD code T2B

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.

3 parts are printed T2B

Not sure which one you have?

Answer up to 4 quick questions and these 3 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • LM20BIM7SOT-353Temperature sensor, 5 pins, Texas Instruments
    What it is
    Temperature sensor
    Maker
    Texas Instruments
    Package
    SOT-353
    Pins
    5
    Details
    2.4-V, 10-µA, SC70, DSBGA Temperature Sensor
    Source
    From the manufacturer's datasheet

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

    Datasheetfor LM20BIM7, opens in a new tab
  • LM20BIM7XSOT-353Temperature sensor, 5 pins, Texas Instruments
    What it is
    Temperature sensor
    Maker
    Texas Instruments
    Package
    SOT-353
    Pins
    5
    Details
    2.4-V, 10-µA, SC70, DSBGA Temperature Sensor
    Source
    From the manufacturer's datasheet

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

    Datasheetfor LM20BIM7X, opens in a new tab
  • PJT7872BSOT-363MOSFET, 6 pins, Panjit
    What it is
    MOSFET
    Maker
    Panjit
    Package
    SOT-363
    Pins
    6
    Source
    From the manufacturer's datasheet

    Is it dead? The meter test is below: MOSFET.

    Datasheetfor PJT7872B, opens in a new tab

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.

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.

MOSFET

Diode range, part lifted. Test drain to source first, then short gate to source and test again.

Working, it reads

One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.

Dead, it reads

  • Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
  • The gate reads low to source or drain: gate shorted.
  • No body diode at all: failed open.
On the board
the gate usually has a resistor to the source, which reads as that resistor and is not a fault. Lift a leg to be sure.
Compare:
If an identical part sits elsewhere on the board, measure it the same way: that is what this one should read.
Watch for:
The diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.

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 T2B

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

Open this in the search to correct a character or try another package.