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Found on 3 components on 1 board.

What K1Y is

One code, more than one part. SMD marking codes are short, and manufacturers reuse them: the same code can be a different part in a different package (a SOT-23 transistor and a SOD-123 diode can both be marked K1Y), or from a different maker. Check the package and what the part does in the circuit before replacing it.

Where it's been found

Ask about a part marked K1Y