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SMD code C1Q in SOT-23-6

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.

1 part in SOT-23-6 is printed C1Q

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.

  • BRCS1C0P06MFQSOT-23-6P-channel MOSFET, 6 pins, Blue RocketP-channel MOSFET6 pinsBlue Rocket
    What it is
    P-channel MOSFET
    Maker
    Blue Rocket
    Package
    SOT-23-6
    Pins
    6
    Source
    Manufacturer datasheet

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

    Datasheetfor BRCS1C0P06MFQ, opens in a new tab
  • 1 more part has no package on record. Nothing rules it out, so it stays.
    • uPC2745TRF amplifier (MMIC), NEC ElectronicsRF amplifier (MMIC)Not recordedNEC Electronics
      What it is
      RF amplifier (MMIC)
      Maker
      NEC Electronics
      Package
      Not recorded
      Pins
      Not recorded
      Details
      Monolithic microwave IC: UHF-amplifier, 2.7GHz, Ucc=3V
      Source
      Published code list

      Is it dead? The meter test is below: RF amplifier.

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.

P-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 drain, black on the source: 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. 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.

RF amplifier

Voltage, board powered, on the output pin that the bias resistor or choke feeds.

Working, it reads

The output pin sits at the device voltage the datasheet gives, a few volts, below the supply.

Dead, it reads

  • Output pin at 0 V, or near 0 Ω to ground with the power off: shorted inside.
  • Output pin at the full supply voltage: open inside, no current flowing.
On the board:
Measured on the board with power on; the bias network is part of the reading.
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 figures depend on the part and its bias resistor. The datasheet gives both.

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 C1Q

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 C1Q

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 6 more parts.

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