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SMD code C127

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.

C127 on a chip capacitor

120 µF, 16 V

120 µF, 16 V tantalum capacitor

A moulded tantalum capacitor: 127 is the capacitance in picofarads (120 µF) and C is the rated-voltage code (16 V).

Check it with a meter

Lift one end and measure it on a capacitance range. A good one reads close to 120 µF. In circuit the meter also sees everything connected across it, so the reading means little until it is out. It is polarised: the band on the body marks the positive end, and a tantalum fitted backwards fails short, sometimes with a flame. A failed tantalum usually reads near 0 Ω both ways, often with a burnt or cracked body. A failed reading does not change what to fit: the marking still says 120 µF, 16 V. Fit the same capacitance at the same or a higher voltage.

On a transistor or diode body (SMB, SOIC-8, SOT-23), C127 is a part code instead. Those parts are listed below.

2 parts are printed C127

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.

Logic gate, all ETEK. What differs:

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.

Printed with a code easy to misread as C127

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 C127

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

Did you find your part?

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