Skip to content
WhatSMDSign in

SMD code M in DFN

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.

6 parts in DFN are printed M

Not sure which one you have?

Answer up to 4 quick questions and these 30 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • MC74VHC1GT14MU2DFNLogic gate, onsemiLogic gateNot recordedonsemi
    What it is
    Logic gate
    Maker
    onsemi
    Package
    DFN
    Pins
    Not recorded
    Details
    Single Schmitt-Trigger Inverter
    Source
    Manufacturer datasheet

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

    Datasheetfor MC74VHC1GT14MU2, opens in a new tab
  • MC74VHC1GT14MU3DFNLogic gate, onsemiLogic gateNot recordedonsemi
    What it is
    Logic gate
    Maker
    onsemi
    Package
    DFN
    Pins
    Not recorded
    Details
    Single Schmitt-Trigger Inverter
    Source
    Manufacturer datasheet

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

    Datasheetfor MC74VHC1GT14MU3, opens in a new tab
  • 7SB384MUTCGDFN6 pins, onsemiNot recorded6 pinsonsemi
    What it is
    Not recorded
    Maker
    onsemi
    Package
    DFN
    Pins
    6
    Source
    Published code list

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

  • FP6121-LWDGDFNLDO regulator, FitipowerLDO regulatorNot recordedFitipower
    What it is
    LDO regulator
    Maker
    Fitipower
    Package
    DFN
    Pins
    Not recorded
    Details
    Linear voltage regulator IC: LDO, Dual out, Vout1/Vout2=1.8V/2.6V±2%, 150mA, +CE, Green pack.
    Source
    Published code list

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

  • FP6146-28WDGDFNLDO regulator, FitipowerLDO regulatorNot recordedFitipower
    What it is
    LDO regulator
    Maker
    Fitipower
    Package
    DFN
    Pins
    Not recorded
    Details
    Linear voltage regulator IC: LDO, 2.8V±2%, 300mA, +CE
    Source
    Published code list

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

  • NLU1GT14MUDFNonsemiNot recordedNot recordedonsemi
    What it is
    Not recorded
    Maker
    onsemi
    Package
    DFN
    Pins
    Not recorded
    Details
    CMOS logic IC: Inverter with Schmitt-trigger input, TTL level
    Source
    Published code list

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

  • 9 more parts have no package on record. Nothing rules them out, so they stay.

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.

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.

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.

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.

Codes that begin with M

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 2,293 more parts.

Did you find your part?

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