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SMD code 334

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.

334 on a chip resistor

330 kΩ

330 kΩ resistor, 5%

33 followed by 4 zeros. Three digits is normally the 5% series. The same marking also reads as 330 nF on a capacitor, and nothing in the code says which; the body of the part does.

Other readings of the same characters, most likely first

  • 330 nF capacitor

Check it with a meter

Lift one end and measure across it. A good one reads 330 kΩ within 5%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 330 kΩ on the board is a fault. Open, or well above 330 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 330 kΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.

On a transistor or diode body (SOT-23, SMB, SMC), 334 is a part code instead. Those parts are listed below.

14 parts are printed 334

Not sure which one you have?

Answer up to 4 quick questions and these 14 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • PLR3304DFNESD protection diode, ProTek DevicesESD protection diodeDFNNot recordedProTek Devices
    What it is
    ESD protection diode
    Maker
    ProTek Devices
    Package
    DFN
    Pins
    Not recorded
    Details
    400 Watt Steering Diode/TVS Array
    Source
    Manufacturer datasheet

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

    Datasheetfor PLR3304, opens in a new tab
  • TPT1334-T8TRSOT-23-88 pins, 3PEAKNot recordedSOT-23-88 pins3PEAK
    What it is
    Not recorded
    Maker
    3PEAK
    Package
    SOT-23-8
    Pins
    8
    Details
    3.3-V Fault Protected High-Speed CAN FD Transceiver
    Source
    Manufacturer datasheet

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

    Datasheetfor TPT1334-T8TR, opens in a new tab
  • HE732534MM3SOT-23LDO regulator, 3 pins, Heermicr SemicconductorLDO regulatorSOT-233 pinsHeermicr Semicconductor
    What it is
    LDO regulator
    Maker
    Heermicr Semicconductor
    Package
    SOT-23
    Pins
    3
    Details
    Linear voltage regulator IC: LDO, 3.4V±2%, 250mA
    Source
    Published code list

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

  • HM732534MRSOT-23LDO regulator, 3 pins, Huamei SemiconductorLDO regulatorSOT-233 pinsHuamei Semiconductor
    What it is
    LDO regulator
    Maker
    Huamei Semiconductor
    Package
    SOT-23
    Pins
    3
    Details
    Linear voltage regulator IC: LDO, 3.4V±2%, 300mA
    Source
    Published code list

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

  • R1126N341DSOT-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, auto discharge, 3.4V±2%, 150mA
    Source
    Published code list

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

  • R3112N341CSOT-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
    CMOS-IC: Voltage Detector 3.4V, Reset Open drain output
    Source
    Published code list

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

  • XC6104A435MRSOT-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 3.5V, 5%, Hst, ±Reset PPO, Wt=200ms, Rt=3.13ms
    Source
    Published code list

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

  • XC6203E352FRSOT-223TorexNot recordedSOT-223Not recordedTorex
    What it is
    Not recorded
    Maker
    Torex
    Package
    SOT-223
    Pins
    Not recorded
    Details
    VR-IC: 3.5V±2%, 400mA
    Source
    Published code list

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

  • XC6203E352MRSOT-233 pins, TorexNot recordedSOT-233 pinsTorex
    What it is
    Not recorded
    Maker
    Torex
    Package
    SOT-23
    Pins
    3
    Details
    VR-IC: 3.5V±2%, 400mA
    Source
    Published code list

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

  • XC6203E352PRSOT-893 pins, TorexNot recordedSOT-893 pinsTorex
    What it is
    Not recorded
    Maker
    Torex
    Package
    SOT-89
    Pins
    3
    Details
    VR-IC: 3.5V±2%, 400mA
    Source
    Published code list

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

  • XC6372E341PSOT-89-5DC-DC converter, 5 pins, TorexDC-DC converterSOT-89-55 pinsTorex
    What it is
    DC-DC converter
    Maker
    Torex
    Package
    SOT-89-5
    Pins
    5
    Details
    DC/DC voltage converter IC: PWM/PFM st-up, 100kHz, 3.4V±2.5%, 100mA, int. Vdd
    Source
    Published code list

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

  • XC6403AA34MSOT-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, 2.85V±2%, 300mA, Vdi=2.55V, -Reset ODO, +CE, PDR
    Source
    Published code list

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

  • XC6403AA34PSOT-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, 2.85V±2%, 300mA, Vdi=2.55V, -Reset ODO, +CE, PDR
    Source
    Published code list

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

  • 1 more part has no package on record

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.

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.

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.

Codes that begin with 334

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

Did you find your part?

Open this in the search to correct a character or try another package.