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WhatSMDSign in

SMD code UE 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.

16 parts in SMA are printed UE

Not sure which one you have?

Answer up to 4 quick questions and these 49 parts are ranked, with a meter test that settles it. It works on a dead part too.

all SMA, 2 pins. What differs:

  • ASMAJ300CA-HFSMATVS diode, ComchipTVS diodeComchip
    What it is
    TVS diode
    Maker
    Comchip
    Package
    SMA
    Pins
    2
    Details
    300 V 400 W bidirectional TVS diode
    Source
    Manufacturer datasheet

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

    Datasheetfor ASMAJ300CA-HF, opens in a new tab
  • SMAJ12CASMATVS diode, JieJieTVS diodeJieJie
    What it is
    TVS diode
    Maker
    JieJie
    Package
    SMA
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAJ12CA, opens in a new tab
  • SMAJ12CA-AUSMATVS diode, JieJieTVS diodeJieJie
    What it is
    TVS diode
    Maker
    JieJie
    Package
    SMA
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAJ12CA-AU, opens in a new tab
  • SMAJ300CASMATVS diode, Good-ArkTVS diodeGood-Ark
    What it is
    TVS diode
    Maker
    Good-Ark
    Package
    SMA
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAJ300CA, opens in a new tab
  • SMAJ300CA-HFSMATVS diode, ComchipTVS diodeComchip
    What it is
    TVS diode
    Maker
    Comchip
    Package
    SMA
    Pins
    2
    Details
    300 V 400 W bidirectional TVS diode
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAJ300CA-HF, opens in a new tab
  • SMAJ300CA-SSMATVS diode, ProTek DevicesTVS diodeProTek Devices
    What it is
    TVS diode
    Maker
    ProTek Devices
    Package
    SMA
    Pins
    2
    Details
    400 Watt TVS Component
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAJ300CA-S, opens in a new tab
  • SMAJ300CA/TR13SMATVS diode, HXYTVS diodeHXY
    What it is
    TVS diode
    Maker
    HXY
    Package
    SMA
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor SMAJ300CA/TR13, opens in a new tab
  • CD214A-T12CASMATVS diode, BournsTVS diodeBourns
    What it is
    TVS diode
    Maker
    Bourns
    Package
    SMA
    Pins
    2
    Details
    TVS: 12V, 20.1A, 400W(1ms), Bidirectional
    Source
    Published code list

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

  • EC76SMAJ300CASMATVS diode, E-CMOSTVS diodeE-CMOS
    What it is
    TVS diode
    Maker
    E-CMOS
    Package
    SMA
    Pins
    2
    Details
    Transient voltage supressor: Vbr=335..371V, Vrwm=300V, Ipp=0.8A, 400W(1ms), Bidir.
    Source
    Published code list

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

  • FUF1ASMAFagNot recordedFag
    What it is
    Not recorded
    Maker
    Fag
    Package
    SMA
    Pins
    2
    Details
    Si-diode: UltraFast Recovery Rect, 50V, 1A, 50..75ns
    Source
    Published code list

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

  • P4SMAJ12ACSMAPanjitNot recordedPanjit
    What it is
    Not recorded
    Maker
    Panjit
    Package
    SMA
    Pins
    2
    Details
    TVS: 12V, 20.1A, 400W (1ms), Bidirectional
    Source
    Published code list

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

  • P4SMAJ12CASMAPanjitNot recordedPanjit
    What it is
    Not recorded
    Maker
    Panjit
    Package
    SMA
    Pins
    2
    Details
    TVS: 12V, 20.1A, 400W(1ms), Bidirectional
    Source
    Published code list

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

  • P4SMAJ300CASMAMicro Commercial ComponentsNot recordedMicro Commercial Components
    What it is
    Not recorded
    Maker
    Micro Commercial Components
    Package
    SMA
    Pins
    2
    Details
    TVS: 300V, 0.8A, 400W(1ms), Bidirectional
    Source
    Published code list

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

  • P4SMAJ340CASMATVS diode, Frontier ElectronicsTVS diodeFrontier Electronics
    What it is
    TVS diode
    Maker
    Frontier Electronics
    Package
    SMA
    Pins
    2
    Details
    Transient voltage supressor: Vrwm=340V, Vbr=378..418V, Ipp=0.60A, 400W(1ms), Bidir.
    Source
    Published code list

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

  • SMA6J12CASMATVS diode, Micro Commercial ComponentsTVS diodeMicro Commercial Components
    What it is
    TVS diode
    Maker
    Micro Commercial Components
    Package
    SMA
    Pins
    2
    Source
    Published code list

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

    Datasheetfor SMA6J12CA, opens in a new tab

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.

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.

Codes that begin with UE

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

Codes not listed here are printed on 2 more parts.

Did you find your part?

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