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WhatSMDSign in

SMD code 77 in SOT-323

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.

4 parts in SOT-323 are printed 77

Not sure which one you have?

Answer up to 4 quick questions and these 21 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • 2SC5004-FBSOT-3233 pins, NEC ElectronicsNot recorded3 pinsNEC Electronics
    What it is
    Not recorded
    Maker
    NEC Electronics
    Package
    SOT-323
    Pins
    3
    Details
    Si-npn: UHF-Mix/Osc, 20V, 60mA, 100mW, B=60..120, 5GHz
    Source
    Published code list

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

  • AP8822N-47GTSOT-323Voltage supervisor, 3 pins, Anwell SemiconductorVoltage supervisor3 pinsAnwell Semiconductor
    What it is
    Voltage supervisor
    Maker
    Anwell Semiconductor
    Package
    SOT-323
    Pins
    3
    Details
    Voltage detector IC: 4.7V±2%, -Reset ODO, Rdt=200ms, H-free
    Source
    Published code list

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

  • AP8822N-47PTSOT-323Voltage supervisor, 3 pins, Anwell SemiconductorVoltage supervisor3 pinsAnwell Semiconductor
    What it is
    Voltage supervisor
    Maker
    Anwell Semiconductor
    Package
    SOT-323
    Pins
    3
    Details
    Voltage detector IC: 4.7V±2%, -Reset ODO, Rdt=200ms
    Source
    Published code list

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

  • EC95810N47C1NSOT-323Voltage supervisor, 3 pins, E-CMOSVoltage supervisor3 pinsE-CMOS
    What it is
    Voltage supervisor
    Maker
    E-CMOS
    Package
    SOT-323
    Pins
    3
    Details
    Voltage detector IC: 4.7V±2%, -Reset ODO, Rdt=200ms
    Source
    Published code list

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

  • 11 more parts have no package on record. Nothing rules them out, so they stay.
    • BBY55-02WInfineonNot recordedNot recordedInfineon
      What it is
      Not recorded
      Maker
      Infineon
      Package
      Not recorded
      Pins
      Not recorded
      Source
      Manufacturer datasheet

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

      Datasheetfor BBY55-02W, opens in a new tab
    • RF302LB2SRectifier, ROHMRectifierNot recordedROHM
      What it is
      Rectifier
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Super Fast Recovery Diode
      Source
      Manufacturer datasheet

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

      Datasheetfor RF302LB2S, opens in a new tab
    • AP8822N-47GIVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.7V±2%, -Reset ODO, 200ms Rt delay, H-free
      Source
      Published code list

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

    • AP8822N-47GSVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.7V±2%, -Reset ODO, 200ms Rt delay, H-free
      Source
      Published code list

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

    • AP8822N-47PIVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.7V±2%, -Reset ODO, 200ms Rt delay
      Source
      Published code list

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

    • AP8822N-47PSVoltage supervisor, Anwell SemiconductorVoltage supervisorNot recordedAnwell Semiconductor
      What it is
      Voltage supervisor
      Maker
      Anwell Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.7V±2%, -Reset ODO, 200ms Rt delay
      Source
      Published code list

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

    • BFQ77InfineonNot recordedNot recordedInfineon
      What it is
      Not recorded
      Maker
      Infineon
      Package
      Not recorded
      Pins
      Not recorded
      Details
      npn fT 7GHz 15V 20mA
      Source
      Published code list

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

    • EC95810N47C7IVoltage supervisor, E-CMOSVoltage supervisorNot recordedE-CMOS
      What it is
      Voltage supervisor
      Maker
      E-CMOS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.7V±2%, -Reset ODO, Td=200ms
      Source
      Published code list

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

    • EC95810N47C7SVoltage supervisor, E-CMOSVoltage supervisorNot recordedE-CMOS
      What it is
      Voltage supervisor
      Maker
      E-CMOS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.7V±2%, -Reset ODO, Td=200ms
      Source
      Published code list

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

    • IXD5126N33A7R-GVoltage supervisor, IXYSVoltage supervisorNot recordedIXYS
      What it is
      Voltage supervisor
      Maker
      IXYS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 3.3V±0.8%, -Reset ODO
      Source
      Published code list

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

    • TXB0302DQMTexas InstrumentsNot recordedNot recordedTexas Instruments
      What it is
      Not recorded
      Maker
      Texas Instruments
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS logic IC: 2-bit bidirectional voltage-level translator with auto direction-sensing
      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.

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.

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.

Printed with a code easy to misread as 77

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 1 more part.

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