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WhatSMDSign in

SMD code T1 in DFN

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 DFN are printed T1

Not sure which one you have?

Answer up to 4 quick questions and these 18 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • R3117K283CDFNVoltage supervisor, RicohVoltage supervisorNot recordedRicoh
    What it is
    Voltage supervisor
    Maker
    Ricoh
    Package
    DFN
    Pins
    Not recorded
    Details
    Voltage detector IC: 2.8V±1%, -Reset PPO, Sense
    Source
    Published code list

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

  • RP114K281D5DFNLDO regulator, RicohLDO regulatorNot recordedRicoh
    What it is
    LDO regulator
    Maker
    Ricoh
    Package
    DFN
    Pins
    Not recorded
    Details
    Linear voltage regulator IC: LDO, 2.85V±1%, 300mA, +CE, CL
    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.
    • ESDBNC3V3A1CESD protection diode, JSCJESD protection diodeNot recordedJSCJ
      What it is
      ESD protection diode
      Maker
      JSCJ
      Package
      Not recorded
      Pins
      Not recorded
      Details
      ESD protection diode, VRWM 3.3 V
      Source
      Manufacturer datasheet

      Is it dead? The meter test is below: TVS or ESD protection diode.

      Datasheetfor ESDBNC3V3A1C, opens in a new tab
    • TCN1-23+RF transformer, Mini-CircuitsRF transformerNot recordedMini-Circuits
      What it is
      RF transformer
      Maker
      Mini-Circuits
      Package
      Not recorded
      Pins
      Not recorded
      Details
      RF transformer, 1300-2300 MHz
      Source
      Manufacturer datasheet

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

      Datasheetfor TCN1-23+, opens in a new tab
    • TST11-511WSchottky diode, Taitron ComponentsSchottky diodeNot recordedTaitron Components
      What it is
      Schottky diode
      Maker
      Taitron Components
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Schottky Barrier Diodes (Multiple Terminals)
      Source
      Manufacturer datasheet

      Is it dead? The meter test is below: Schottky diode.

      Datasheetfor TST11-511W, opens in a new tab
    • AP8822C-11GIVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.1V±2%, -Reset PPO, 200ms Rt delay, H-free
      Source
      Published code list

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

    • AP8822C-11GSVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.1V±2%, -Reset PPO, 200ms Rt delay, H-free
      Source
      Published code list

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

    • AP8822C-11PIVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.1V±2%, -Reset PPO, 200ms Rt delay
      Source
      Published code list

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

    • AP8822C-11PSVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 1.1V±2%, -Reset PPO, 200ms Rt delay
      Source
      Published code list

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

    • BD45475GVoltage supervisor, ROHMVoltage supervisorNot recordedROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS-IC: Voltage Detector 4,7V, -Reset Open drain output, 500ms
      Source
      Published code list

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

    • FP6146-12C8GLDO regulator, FitipowerLDO regulatorNot recordedFitipower
      What it is
      LDO regulator
      Maker
      Fitipower
      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.

    • HD74LV1GT00ACMRenesasNot recordedNot recordedRenesas
      What it is
      Not recorded
      Maker
      Renesas
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS logic IC: 2-input NAND gate with logic level shifter
      Source
      Published code list

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

    • HD74LV1GT00AVSRenesasNot recordedNot recordedRenesas
      What it is
      Not recorded
      Maker
      Renesas
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS logic IC: 2-input NAND gate with logic level shifter
      Source
      Published code list

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

    • ISL9021IRURZ-T6 pins, RenesasNot recorded6 pinsRenesas
      What it is
      Not recorded
      Maker
      Renesas
      Package
      Not recorded
      Pins
      6
      Details
      equivalent [2.6V LDO]
      Source
      Published code list

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

    • R1131D211DNisshinbo 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, 2.1V±2%, 300mA
      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.

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.

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.

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.

Printed with a code easy to misread as T1

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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