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SMD code C204

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.

C204 on a chip capacitor

200 nF, 16 V

200 nF, 16 V tantalum capacitor

A moulded tantalum capacitor: 204 is the capacitance in picofarads (200 nF) 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 200 nF. 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 200 nF, 16 V. Fit the same capacitance at the same or a higher voltage.

On a transistor or diode body (SOT-23-6, SSOP, SMB), C204 is a part code instead. Those parts are listed below.

5 parts are printed C204

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.

  • ET74AHC2G04TSOT-23-66 pins, ETEKNot recordedSOT-23-66 pinsETEK
    What it is
    Not recorded
    Maker
    ETEK
    Package
    SOT-23-6
    Pins
    6
    Source
    Manufacturer datasheet

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

    Datasheetfor ET74AHC2G04T, opens in a new tab
  • ET74HC2G04TSOT-23-66 pins, ETEKNot recordedSOT-23-66 pinsETEK
    What it is
    Not recorded
    Maker
    ETEK
    Package
    SOT-23-6
    Pins
    6
    Source
    Manufacturer datasheet

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

    Datasheetfor ET74HC2G04T, opens in a new tab
  • ET74LVC2G04TSOT-23-66 pins, ETEKNot recordedSOT-23-66 pinsETEK
    What it is
    Not recorded
    Maker
    ETEK
    Package
    SOT-23-6
    Pins
    6
    Source
    Manufacturer datasheet

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

    Datasheetfor ET74LVC2G04T, opens in a new tab
  • ETQ74LVC2G04TSOT-23-66 pins, ETEKNot recordedSOT-23-66 pinsETEK
    What it is
    Not recorded
    Maker
    ETEK
    Package
    SOT-23-6
    Pins
    6
    Source
    Manufacturer datasheet

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

    Datasheetfor ETQ74LVC2G04T, opens in a new tab
  • CMR2-04SMBRectifier, 2 pins, Central SemiconductorRectifierSMB2 pinsCentral Semiconductor
    What it is
    Rectifier
    Maker
    Central Semiconductor
    Package
    SMB
    Pins
    2
    Details
    Si-diode: GP, Rect, 400V, 2A, Vf<1.1V(2A)
    Source
    Published code list

    Is it dead? The meter test is below: Silicon diode.

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.

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.

Silicon diode

Diode range, part lifted or one leg off the pad. Red probe on the anode.

Working, it reads

About 0.5 to 0.8 V anode to cathode, and open the other way. Small switching diodes read about 0.6 to 0.7 V; large rectifiers can read a little lower.

Dead, it reads

  • The same reading both ways round, near 0 V with a continuous beep or the same middling value: shorted.
  • Open both ways: failed open.
  • A reading the wrong way round as well: leaky.
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.
Watch for:
A three-pin body can hold two diodes. With a common pin they read two junctions from that pin, just like a transistor; in series they read two drops end to end. Test each pair the datasheet names.

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 C204

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 C204

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

Did you find your part?

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