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WhatSMDSign in

SMD code YY in SMA

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.

6 parts in SMA are printed YY

Not sure which one you have?

Answer up to 4 quick questions and these 16 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • SMAJ51CSMATVS diode, HottechTVS diodeHottech
    What it is
    TVS diode
    Maker
    Hottech
    Package
    SMA
    Pins
    2
    Details
    TVS diode, VRWM 51 V, bidirectional
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAJ51C, opens in a new tab
  • EC76SMAJ51CSMATVS diode, E-CMOSTVS diodeE-CMOS
    What it is
    TVS diode
    Maker
    E-CMOS
    Package
    SMA
    Pins
    2
    Details
    Transient voltage supressor: Vbr=56.7..69.3V, Vrwm=51V, Ipp=4.4A, 400W(1ms), Bidir.
    Source
    Published code list

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

  • P4SMAJ51CSMATVS diode, Shanghai Lunsure Electronic TechnologyTVS diodeShanghai Lunsure Electronic Technology
    What it is
    TVS diode
    Maker
    Shanghai Lunsure Electronic Technology
    Package
    SMA
    Pins
    2
    Details
    TVS: 51V, 4.4A, 400W (1ms), Bidirectional
    Source
    Published code list

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

  • P4SMAJ210CSMAPanjitNot recordedPanjit
    What it is
    Not recorded
    Maker
    Panjit
    Package
    SMA
    Pins
    2
    Details
    TVS: 170V, 1.1A, 400W (1ms), Bidirectional
    Source
    Published code list

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

  • TV04A510KBSMAComchipNot recordedComchip
    What it is
    Not recorded
    Maker
    Comchip
    Package
    SMA
    Pins
    2
    Details
    TVS: 51V, 10%, 4.4A, 400W(1ms), Bidirectional
    Source
    Published code list

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

  • TV04A510KB-GSMATVS diode, ComchipTVS diodeComchip
    What it is
    TVS diode
    Maker
    Comchip
    Package
    SMA
    Pins
    2
    Details
    Transient voltage supressor: Vrwm=51.0V, Vbr=56.70..69.30V, Ipp=4.39A, 400W(1ms), Bidir.
    Source
    Published code list

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

  • 9 more parts have no package on record. Nothing rules them out, so they stay.
    • NC7SZ00FHLogic gate, onsemiLogic gateonsemi
      What it is
      Logic gate
      Maker
      onsemi
      Package
      Not recorded
      Pins
      Not recorded
      Details
      TinyLogic UHS Two-Input NAND Gate
      Source
      Manufacturer datasheet

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

      Datasheetfor NC7SZ00FH, opens in a new tab
    • NC7SZ00L6Logic gate, onsemiLogic gateonsemi
      What it is
      Logic gate
      Maker
      onsemi
      Package
      Not recorded
      Pins
      Not recorded
      Details
      TinyLogic UHS Two-Input NAND Gate
      Source
      Manufacturer datasheet

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

      Datasheetfor NC7SZ00L6, opens in a new tab
    • 74AUP1G125FS3Diodes IncorporatedNot recordedDiodes Incorporated
      What it is
      Not recorded
      Maker
      Diodes Incorporated
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS logic IC: Bus buffer gate with 3-state output
      Source
      Published code list

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

    • BD45E465G-MVoltage supervisor, ROHMVoltage supervisorROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 4.6V±1%, -MR, -Reset ODO, Rdt=50ms
      Source
      Published code list

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

    • BU4231FVoltage supervisor, ROHMVoltage supervisorROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS-IC: Voltage Detector 3,1V, Reset Open drain output
      Source
      Published code list

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

    • BU4231FWEVoltage supervisor, ROHMVoltage supervisorROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS-IC: Voltage Detector 3,1V, Reset Open drain output
      Source
      Published code list

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

    • BU4231GVoltage supervisor, ROHMVoltage supervisorROHM
      What it is
      Voltage supervisor
      Maker
      ROHM
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS-IC: Voltage Detector 3,1V, Reset Open drain output
      Source
      Published code list

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

    • NC7SZ00LFairchild SemiconductorNot recordedFairchild Semiconductor
      What it is
      Not recorded
      Maker
      Fairchild Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      CMOS logic IC: 2-input NAND gate
      Source
      Published code list

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

    • XC6223H38BNR-GLDO regulator, TorexLDO regulatorTorex
      What it is
      LDO regulator
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Linear voltage regulator IC: LDO, 3.85V±1%, 300mA, +CE, CL, PDR, ICP
      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.

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.

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.

Printed with a code easy to misread as YY

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 YY

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

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