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SMD code 4103

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.

5 parts are printed 4103

Not sure which one you have?

Answer up to 4 quick questions and these 5 parts are ranked, with a meter test that settles it. It works on a dead part too.

  • MTC4103N6SOT-23-66 pins, CYStekSOT-23-66 pinsCYStek
    What it is
    Complementary MOSFET pair (N-channel and P-channel)
    Maker
    CYStek
    Package
    SOT-23-6
    Pins
    6
    Details
    30 V, 3.2/-2.7 A N+P-channel MOSFET
    Source
    Manufacturer datasheet

    Is it dead? The meter test is below: MOSFET pair.

    Datasheetfor MTC4103N6, opens in a new tab
  • MD4103DDFNMegaPower SemiconductorDFNNot recordedMegaPower Semiconductor
    What it is
    Not recorded
    Maker
    MegaPower Semiconductor
    Package
    DFN
    Pins
    Not recorded
    Details
    Linear IC: APA, BTL, class-D, 2.2..5.5V, 3W(5V/4), shutdown
    Source
    Published code list

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

  • MD4103PESOP-88 pins, MegaPower SemiconductorESOP-88 pinsMegaPower Semiconductor
    What it is
    Not recorded
    Maker
    MegaPower Semiconductor
    Package
    ESOP-8
    Pins
    8
    Details
    Linear IC: APA, BTL, class-D, 2.2..5.5V, 3W(5V/4), shutdown
    Source
    Published code list

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

  • MD4103SMSOP-88 pins, MegaPower SemiconductorMSOP-88 pinsMegaPower Semiconductor
    What it is
    Not recorded
    Maker
    MegaPower Semiconductor
    Package
    MSOP-8
    Pins
    8
    Details
    Linear IC: APA, BTL, class-D, 2.2..5.5V, 3W(5V/4), shutdown
    Source
    Published code list

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

  • 1 more part has no package on record
    • MTC4103N8JCYStekNot recordedNot recordedCYStek
      What it is
      Complementary MOSFET pair (N-channel and P-channel)
      Maker
      CYStek
      Package
      Not recorded
      Pins
      Not recorded
      Details
      30 V, 6.8/-6.2 A N+P-channel MOSFET
      Source
      Manufacturer datasheet

      Is it dead? The meter test is below: MOSFET pair.

      Datasheetfor MTC4103N8J, 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.

MOSFET pair

Diode range, part lifted. Test drain to source first, then short gate to source and test again. Test each MOSFET on its own pins, as the datasheet's pinout gives them.

Working, it reads

One way between drain and source reads about 0.4 to 0.9 V, the body diode, and the other way open. The gate reads open to both other pins.

Dead, it reads

  • Drain to source the same both ways, near 0 V with a continuous beep, and still so after shorting gate to source: shorted. The classic failure.
  • The gate reads low to source or drain: gate shorted.
  • No body diode at all: failed open.
On the board
the gate usually has a resistor to the source, which reads as that resistor and is not a fault. Lift a leg to be sure.
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 diode range can charge the gate enough to turn the part on, and then drain to source reads near 0 both ways on a good part. Short gate to source and test again before you condemn it.

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.

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