SMD code C434
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.
C434 on a chip capacitor
430 nF, 16 V
430 nF, 16 V tantalum capacitor
A moulded tantalum capacitor: 434 is the capacitance in picofarads (430 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 430 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 430 nF, 16 V. Fit the same capacitance at the same or a higher voltage.
On a transistor or diode body (SOT-23-5), C434 is a part code instead. Those parts are listed below.
The only part printed C434 in our tables
APX803L20-34W5
- What it is
- Voltage supervisor
- Maker
- Diodes Incorporated
- Package
- SOT-23-5
- Pins
- 5
- Details
- Voltage detector IC: 3.4V±1.5%, -Reset ODO, 220ms Rdt delay
- Source
- Published code list
Is it dead?
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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