Automotive-grade voltage supervisor for 4.63V rails
The MAX6316MUK46CY+ is a single-channel power supply monitor from Analog Devices, part of their AEC-Q100 qualified automotive series. The bidirectional output allows the reset signal to be shared between the supervisor and the monitored processor — the pin can both drive the reset line low and be pulled low by an external watchdog or manual reset button, simplifying the reset topology on the board.
AEC-Q100 qualification and temperature range
The AEC-Q100 qualification means the part has passed the stress tests (high-temperature operating life, temperature cycling, ESD, latch-up) required for production automotive programs. The 4.63V threshold is suited for monitoring 5V nominal rails — it triggers before the supply drops below the minimum operating voltage of most 5V logic and MCUs, giving the processor time to save state before the rails collapse.
SOT-23-5 package and board integration
Housed in a SC-74A / SOT-753 package (commonly called SOT-23-5), the part occupies minimal board area. The five-pin footprint includes the monitored input, reset output, ground, and supply — no external timing capacitor is needed for the reset timeout period.
For BOM placement, confirm the reset polarity (active low) and threshold voltage (4.63V) match the monitored rail and processor reset input. The bidirectional output handles shared reset networks but requires an external pull-up resistor to Vcc.