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WhatSMDSign in

SMD code T0 in SOT-343

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.

2 parts in SOT-343 are printed T0

Not sure which one you have?

Answer up to 4 quick questions and these 15 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • R3116Q271CSOT-343Voltage supervisor, 4 pins, RicohVoltage supervisor4 pinsRicoh
    What it is
    Voltage supervisor
    Maker
    Ricoh
    Package
    SOT-343
    Pins
    4
    Details
    Voltage detector IC: 2.7V±0.8%, -Reset PPO
    Source
    Published code list

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

  • RP104Q271B5SOT-343LDO regulator, 4 pins, RicohLDO regulator4 pinsRicoh
    What it is
    LDO regulator
    Maker
    Ricoh
    Package
    SOT-343
    Pins
    4
    Details
    Linear voltage regulator IC: LDO, 2.75V±0.8%, 150mA,
    Source
    Published code list

    Is it dead? The meter test is below: Voltage regulator.

  • 13 more parts have no package on record. Nothing rules them out, so they stay.
    • AP8822C-10GIVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.0V±2%, -Reset PPO, 200ms Rt delay, H-free
      Source
      Published code list

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

    • AP8822C-10GSVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.0V±2%, -Reset PPO, 200ms Rt delay, H-free
      Source
      Published code list

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

    • AP8822C-10PIVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.0V±2%, -Reset PPO, 200ms Rt delay
      Source
      Published code list

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

    • AP8822C-10PSVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.0V±2%, -Reset PPO, 200ms Rt delay
      Source
      Published code list

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

    • BCT2160ELS30-TRLDO regulator, Broadchip Technology GroupLDO regulatorNot recordedBroadchip Technology Group
      What it is
      LDO regulator
      Maker
      Broadchip Technology Group
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, 3.0V±2%, 300mA, +CE
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

    • BCT2160ELS50-TRLDO regulator, Broadchip Technology GroupLDO regulatorNot recordedBroadchip Technology Group
      What it is
      LDO regulator
      Maker
      Broadchip Technology Group
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, 5.0V±2%, 300mA, +CE
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

    • BD45485GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS-IC: Voltage Detector 4,8V, -Reset Open drain output, 500ms
      Source
      Published code list

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

    • ISL9021IRUFZ-T6 pins, RenesasNot recorded6 pinsRenesas
      What it is
      Not recorded
      Maker
      Renesas
      Package
      Not recorded
      Pins
      6
      Details
      equivalent [2.5V LDO]
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

    • R1131D201DNisshinbo Micro DevicesNot recordedNot recordedNisshinbo Micro Devices
      What it is
      Not recorded
      Maker
      Nisshinbo Micro Devices
      Package
      Not recorded
      Pins
      Not recorded
      Details
      VR-IC: LDO, CE, auto discharge, 2V±2%, 300mA
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

    • R1163D201BNisshinbo Micro DevicesNot recordedNot recordedNisshinbo Micro Devices
      What it is
      Not recorded
      Maker
      Nisshinbo Micro Devices
      Package
      Not recorded
      Pins
      Not recorded
      Details
      VR-IC: LDO, CE, 2V±1.5%, 150mA
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

    • TP0601TTemNot recordedNot recordedTem
      What it is
      Not recorded
      Maker
      Tem
      Package
      Not recorded
      Pins
      Not recorded
      Details
      p-ch mosfet 60V 0.12A
      Source
      Published code list

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

    • XC6225A22ANR-GLDO regulator, TorexLDO regulatorNot recordedTorex
      What it is
      LDO regulator
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, 2.25V±2%, 30mA, +CE
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

    • XC6228A1229R-GLDO regulator, TorexLDO regulatorNot recordedTorex
      What it is
      LDO regulator
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, 1.2V±2%, 300mA, +CE
      Source
      Published code list

      Is it dead? The meter test is below: Voltage regulator.

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.

Voltage regulator

Voltage, board powered, black probe on ground. Then ohms with the power off.

Working, it reads

Input pin at the supply, output pin at its rated voltage, and the enable pin high if it has one.

Dead, it reads

  • Output equal to the input: the pass element has shorted. Everything after it may have taken the full input.
  • Input present, enable high, no output: failed open, or holding itself off into a shorted load. Power off and measure output to ground.
  • Power off, input to output near 0 Ω: shorted.
On the board:
An output at 0 V is often a shorted load with the regulator in current limit. Lift the output pin: if the short stays on the board, the regulator may be fine.
Compare:
The same regulator on another rail or another board shows the right voltages and the right resistances.
Watch for:
Makers put input, output and ground on different pins in the same package, so take them from this part's datasheet. Diode or ohms readings between its pins say little; check it powered.

A dead part still carries its marking. A short or an open says it has failed, not that it is a different part.

P-channel MOSFET

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

Working, it reads

Red probe on the drain, black on the source: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.

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. Often all three pins end up shorted together.
  • No body diode at all: failed open.
On the board
the gate usually has a resistor to the source, so gate to source reads that resistor, which 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 T0

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

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