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SMD code 432

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.

432 on a chip resistor

4.3 kΩ

4.3 kΩ resistor, 5%

43 followed by 2 zeros. Three digits is normally the 5% series. The same marking also reads as 4.3 nF on a capacitor or 4.3 mH on an inductor, and nothing in the code says which; the body of the part does.

The same characters on another part

  • 4.3 nF capacitor
  • 4.3 mH inductor

Check it with a meter

Lift one end and measure across it. A good one reads 4.3 kΩ within 5%. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 4.3 kΩ on the board is a fault. Open, or well above 4.3 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 4.3 kΩ. A burnt resistor usually means the part it feeds drew too much, so find that before fitting a new one.

On a transistor or diode body (SOT-23), 432 is a part code instead. Those parts are listed below.

2 parts are printed 432

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.

Voltage reference, all SOT-23, 3 pins. 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.

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