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TMP114: Marking doesn't match datasheet

Part Number: TMP114

Hello,

Can you help me explain why the marking is different on this part than what the datasheet calls out?

The TI datasheet says they should be marked “YS” and they are marked “18”. “18” is a TI part marking for another tiny, 4-ball package, but not the same package I see here.

https://www.ti.com/lit/ds/symlink/tmp114.pdf?ts=1674146422920&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTMP114