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I can't find anything about this SMD IC marked 4PC.

enter image description here

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    \$\begingroup\$ Some context would help. What sort of circuit is it in? What components is it connected to? Which pins look like they're connected to power supply rails? \$\endgroup\$
    – brhans
    Commented Jan 16, 2023 at 4:54

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Maybe a UM1431S5-30, a 3V regulator enter image description here

Datasheet: http://www.union-ic.com/Upload/Datasheet/Datasheet_UM1431,UM1441_Rev01.pdf

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My investigation. Check details in datasheet, mark code section.

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