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SMD code FHD

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.

11 parts are printed FHD

Not sure which one you have?

Answer up to 4 quick questions and these 11 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • GSMM1W3V3SOD-123Zener diode, 2 pins, Good-ArkZener diodeSOD-1232 pinsGood-Ark
    What it is
    Zener diode
    Maker
    Good-Ark
    Package
    SOD-123
    Pins
    2
    Details
    Zener diode, VZ 3.3 V, 1 W
    Source
    Manufacturer datasheet

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

    Datasheetfor GSMM1W3V3, opens in a new tab
  • MM1W3V3SOD-123FZener diode, 2 pins, Blue RocketZener diodeSOD-123F2 pinsBlue Rocket
    What it is
    Zener diode
    Maker
    Blue Rocket
    Package
    SOD-123F
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor MM1W3V3, opens in a new tab
  • MM1W3V3LSOD-123FZener diode, 2 pins, JSMSEMIZener diodeSOD-123F2 pinsJSMSEMI
    What it is
    Zener diode
    Maker
    JSMSEMI
    Package
    SOD-123F
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor MM1W3V3L, opens in a new tab
  • MM1W3V3L-MSSOD-123FZener diode, 2 pins, MSKSEMIZener diodeSOD-123F2 pinsMSKSEMI
    What it is
    Zener diode
    Maker
    MSKSEMI
    Package
    SOD-123F
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor MM1W3V3L-MS, opens in a new tab
  • IXD5122E743MR-GSOT-23-5Voltage supervisor, 5 pins, IXYSVoltage supervisorSOT-23-55 pinsIXYS
    What it is
    Voltage supervisor
    Maker
    IXYS
    Package
    SOT-23-5
    Pins
    5
    Details
    Voltage detector IC: 4.3V±2%, -Reset ODO, +WDEN, PUR, Wt=800ms, Rdt=200ms
    Source
    Published code list

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

  • XC6122E743MR-GSOT-23-5Voltage supervisor, 5 pins, TorexVoltage supervisorSOT-23-55 pinsTorex
    What it is
    Voltage supervisor
    Maker
    Torex
    Package
    SOT-23-5
    Pins
    5
    Details
    Voltage detector IC: 4.3V±2%, -Reset ODO, +WDEN, PUR, Wt=800ms, Rdt=200ms
    Source
    Published code list

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

  • XC6367F635MRSOT-23-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-23-55 pinsTorex
    What it is
    DC-DC converter
    Maker
    Torex
    Package
    SOT-23-5
    Pins
    5
    Details
    DC/DC voltage converter IC: PWM st-up, 6.3V±2.5%, 200mA, 500kHz, +CE, soft start
    Source
    Published code list

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

  • 4 more parts have no package on record
    • IXD5127C27D7RVoltage supervisor, IXYSVoltage supervisorNot recordedNot recordedIXYS
      What it is
      Voltage supervisor
      Maker
      IXYS
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 2.7V±0.8%, -Reset PPO, -MR, Rdt=400ms
      Source
      Published code list

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

    • IXD9201B1D1BR-GDC-DC converter, ZilogDC-DC converterNot recordedNot recordedZilog
      What it is
      DC-DC converter
      Maker
      Zilog
      Package
      Not recorded
      Pins
      Not recorded
      Details
      DC/DC voltage converter IC: PWM st-dwn, 1.2MHz, 1.35V±2%, 400mA, +CE, CL
      Source
      Published code list

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

    • XC6127C27D7RVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 2.7V±0.8%, -Reset PPO, -MR, Rdt=400ms
      Source
      Published code list

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

    • XCL201B1D1BR-GDC-DC converter, TorexDC-DC converterNot recordedNot recordedTorex
      What it is
      DC-DC converter
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      DC/DC voltage converter IC: PWM st-dwn, 1.2MHz, 1.35V±2%, 400mA, +CE, CL
      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.

Zener diode

Diode range for the forward check, part lifted, red probe on the anode. A bench supply for the Zener voltage.

Working, it reads

About 0.6 to 0.8 V forward and open in reverse on the diode range. Its Zener voltage shows only on a supply: feed it through a resistor that sets about 5 mA, cathode to positive, read quickly, and it should hold near its rated voltage.

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, forward too: failed open.
  • Holds well off its rated voltage on the supply test: drifted.
  • A soft knee, or a voltage that creeps on the supply test: 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 meter's diode range stops at about 2 to 3 V, so almost every Zener reads open in reverse on it, good or bad; a 3 V meter may just show a 2.4 or 2.7 V part. Above about 3 V the meter cannot tell a Zener from a plain diode.

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.

Printed with a code easy to misread as FHD

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 FHD

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

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