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SMD code N306AD

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.

2 parts are printed N306AD

Not sure which one you have?

Answer up to 4 quick questions and these 2 parts are ranked, with a meter test that settles it. It works on a dead part too.

N-channel MOSFET, all Fairchild Semiconductor.

  • ISL9N306AD3STDPAK
    What it is
    N-channel MOSFET
    Maker
    Fairchild Semiconductor
    Package
    DPAK
    Pins
    3
    Details
    N-Channel Logic Level PWM Optimized UltraFET® Trench Power MOSFET
    Source
    Published code list

    Is it dead? The meter test is below: N-channel MOSFET.

  • 1 more part has no package on record
    • ISL9N306AD3
      What it is
      N-channel MOSFET
      Maker
      Fairchild Semiconductor
      Package
      Not recorded
      Pins
      Not recorded
      Details
      N-Channel Logic Level PWM Optimized UltraFET® Trench Power MOSFET
      Source
      Published code list

      Is it dead? The meter test is below: N-channel MOSFET.

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.

N-channel MOSFET

Diode range, part lifted. Test drain to source first, then short gate to source and test again.

Working, it reads

Red probe on the source, black on the drain: about 0.4 to 0.9 V, the body diode. Open the other way. The gate reads open to both other pins, both ways.

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. Often all three pins end up shorted together.
  • No body diode at all: failed open.
On the board
the gate usually has a resistor to the source, so gate to source reads that resistor, which is not a fault. A drain short can be the load. 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.

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