The “-V” grade suggests robust ESD protection (≥8 kV HBM) and transient overvoltage survival up to 40V load dump. Typical circuit includes:

A: From the naming, it’s likely a linear LDO or load switch. Check if an inductor is needed in reference circuits – if yes, it’s a switcher.

With that information, I can likely identify the exact part or a functional equivalent.

The part number JE3989EF-V is not a standard public component number. It is likely an OEM-specific or date-coded marking. Use the decoding steps above, or provide additional details for a more precise identification.

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When used as a fixed LDO: