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SMD code 50K1

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.

50K1 on a chip resistor

50.1 kΩ

50.1 kΩ resistor

The K is both the decimal point and the multiplier: 50.1 kΩ.

Check it with a meter

Lift one end and measure across it. A good one reads 50.1 kΩ. Measuring it in circuit reads the parallel combination of everything around it, which is almost always lower, never higher: well above 50.1 kΩ on the board is a fault. Open, or well above 50.1 kΩ, means it has failed: burnt, cracked or corroded. That does not change what to fit: the marking still says 50.1 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-23-5), 50K1 is a part code instead. Those parts are listed below.

2 parts are printed 50K1

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.

Load switch, all SOT-23-5, 5 pins, all Global Mixed-mode Technology.

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.

Load switch

Voltage, board powered, black probe on ground.

Working, it reads

Switched on, the output pin sits at the input voltage. Switched off, it sits near 0 V.

Dead, it reads

  • Output at the input voltage while switched off: the pass element has shorted.
  • Input present and switched on, no output: failed open, or shut down into a shorted load. Power off and measure output to ground.
On the board:
An output near 0 Ω to ground is usually the load. Lift the output pin to see which.
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 pinout and whether the enable is active high or low differ between parts. 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.

Did you find your part?

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