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SMD code UDL

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 UDL

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.

  • US1DFLSOD-123FRectifier, 2 pins, RectronRectifierSOD-123F2 pinsRectron
    What it is
    Rectifier
    Maker
    Rectron
    Package
    SOD-123F
    Pins
    2
    Source
    Manufacturer datasheet

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

    Datasheetfor US1DFL, opens in a new tab
  • 1.5SMC220ASMCTVS diode, 2 pins, Fagor ElectronicaTVS diodeSMC2 pinsFagor Electronica
    What it is
    TVS diode
    Maker
    Fagor Electronica
    Package
    SMC
    Pins
    2
    Source
    Published code list

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

    Datasheetfor 1.5SMC220A, opens in a new tab
  • MIC2753-LBM5SOT-23-55 pins, MicrelNot recordedSOT-23-55 pinsMicrel
    What it is
    Not recorded
    Maker
    Micrel
    Package
    SOT-23-5
    Pins
    5
    Details
    CMOS-IC: Voltage Detector 4,63V, MR, Reset Open drain output
    Source
    Published code list

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

  • XC9226A3LCMSOT-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/PFM st-dwn, 1.2MHz, 3.85V±1%, 600mA, +CE
    Source
    Published code list

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

  • XC9226B3LCMSOT-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/PFM st-dwn, 1.2MHz, 3.85V±1%, 600mA, -CE
    Source
    Published code list

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

  • XC9226C3LCMSOT-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/PFM st-dwn, 1.2MHz, 3.85V±1%, 600mA, +CE, PDR
    Source
    Published code list

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

  • XC9226D3LCMSOT-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/PFM st-dwn, 1.2MHz, 3.85V±1%, 600mA, -CE, PUR
    Source
    Published code list

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

  • XC9226E3LCMSOT-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/PFM st-dwn, 1.2MHz, 3.85V±1%, 900mA, +CE
    Source
    Published code list

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

  • XC9226F3LCMSOT-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/PFM st-dwn, 1.2MHz, 3.85V±1%, 900mA, -CE
    Source
    Published code list

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

  • XC9226G3LCMSOT-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/PFM st-dwn, 1.2MHz, 3.85V±1%, 900mA, +CE, PDR
    Source
    Published code list

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

  • XC9226H3LCMSOT-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/PFM st-dwn, 1.2MHz, 3.85V±1%, 900mA, -CE, PUR
    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.

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.

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.

Printed with a code easy to misread as UDL

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 UDL

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

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