What this 3-pin supervisor does
The MAX803LEXR is a 3-pin microprocessor supervisory circuit from Maxim Integrated. It monitors a single supply voltage and asserts a reset output when the supply drops below a preset threshold, holding the reset for a timeout period after the supply recovers.
Lifecycle and compliance — what to expect
One catch: it is marked RoHS non-compliant. That is a hard gate for new designs in regulated markets; for legacy or exempt military/industrial builds it may still be acceptable.
The MAX803LEXR is available through independent distribution channels. Because it is an active part with no LTB pressure, lead times tend to be stable — but the RoHS flag means you want to verify your assembly line's exemption status before committing the BOM line.