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SMD code 422

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 422

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.

  • HM1132B33MRSOT-23-5LDO regulator, 5 pins, Huamei SemiconductorLDO regulatorSOT-23-55 pinsHuamei Semiconductor
    What it is
    LDO regulator
    Maker
    Huamei Semiconductor
    Package
    SOT-23-5
    Pins
    5
    Details
    Linear voltage regulator IC: LDO, 3.3V±2%, 100mA, +CE
    Source
    Published code list

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

  • LN1152A332MRSOT-23-5LDO regulator, 5 pins, Shanghai Natlinear ElectronicsLDO regulatorSOT-23-55 pinsShanghai Natlinear Electronics
    What it is
    LDO regulator
    Maker
    Shanghai Natlinear Electronics
    Package
    SOT-23-5
    Pins
    5
    Details
    Linear voltage regulator IC: LDO, 3.3V±2%, 100mA, +CE, PDR
    Source
    Published code list

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

  • R1114N221ASOT-23-55 pins, Nisshinbo Micro DevicesNot recordedSOT-23-55 pinsNisshinbo Micro Devices
    What it is
    Not recorded
    Maker
    Nisshinbo Micro Devices
    Package
    SOT-23-5
    Pins
    5
    Details
    VR-IC: LDO, LN, -CE, 2,2V±2%, 150mA
    Source
    Published code list

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

  • R1191N022BSOT-23-5LDO regulator, 5 pins, RicohLDO regulatorSOT-23-55 pinsRicoh
    What it is
    LDO regulator
    Maker
    Ricoh
    Package
    SOT-23-5
    Pins
    5
    Details
    Linear voltage regulator IC: LDO, 2.2V±1.5%, 300mA, +CE, ECO
    Source
    Published code list

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

  • XC6105A333MRSOT-23-5Voltage supervisor, 5 pins, TorexVoltage supervisorSOT-23-55 pinsTorex
    What it is
    Voltage supervisor
    Maker
    Torex
    Package
    SOT-23-5
    Pins
    5
    Details
    CMOS-IC: VDet 3.3V, 5%, Hst, +Rst PPO, -Rst ODO, Wt=100ms, Rt=3.13ms
    Source
    Published code list

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

  • XC6130A221MR-GSOT-23-6Voltage supervisor, 6 pins, TorexVoltage supervisorSOT-23-66 pinsTorex
    What it is
    Voltage supervisor
    Maker
    Torex
    Package
    SOT-23-6
    Pins
    6
    Details
    Voltage detector IC: 2.2V±1%, -Reset ODO, -MR, Watchdog
    Source
    Published code list

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

  • XC6404AA22MSOT-23-55 pins, TorexNot recordedSOT-23-55 pinsTorex
    What it is
    Not recorded
    Maker
    Torex
    Package
    SOT-23-5
    Pins
    5
    Details
    Linear voltage regulator with volatge detector: LDO, 1.8V±2%, 500mA, Vdi=4.2V, -Reset ODO, +CE, PDR
    Source
    Published code list

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

  • XC6404AA22PSOT-89-55 pins, TorexNot recordedSOT-89-55 pinsTorex
    What it is
    Not recorded
    Maker
    Torex
    Package
    SOT-89-5
    Pins
    5
    Details
    Linear voltage regulator with volatge detector: LDO, 1.8V±2%, 500mA, Vdi=4.2V, -Reset ODO, +CE, PDR
    Source
    Published code list

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

  • 3 more parts have no package on record
    • TCK422GLoad switch, ToshibaLoad switchNot recordedNot recordedToshiba
      What it is
      Load switch
      Maker
      Toshiba
      Package
      Not recorded
      Pins
      Not recorded
      Details
      TCK42xG Series
      Source
      Manufacturer datasheet

      Is it dead? The meter test is below: Load switch.

      Datasheetfor TCK422G, opens in a new tab
    • TK65422MDC-DC converter, Toko AmericaDC-DC converterNot recordedNot recordedToko America
      What it is
      DC-DC converter
      Maker
      Toko America
      Package
      Not recorded
      Pins
      Not recorded
      Details
      DC/DC voltage converter IC: PCA, st-dwn, 2.2V±3%, 100mA, Vbat monitor
      Source
      Published code list

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

    • XC6130A2216R-GVoltage supervisor, TorexVoltage supervisorNot recordedNot recordedTorex
      What it is
      Voltage supervisor
      Maker
      Torex
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Voltage detector IC: 2.2V±1.5%, -Reset ODO, -MR, Watchdog
      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.

Load switch

Voltage, board powered, black probe on ground.

Working, it reads

Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.

Dead, it reads

  • Output at the input voltage while switched off: the pass element has shorted.
  • Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
On the board:
An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
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 pinout and whether the enable is active high or low differ between parts. The datasheet gives both.

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.

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 422

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 422

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

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