Two-rail watchdog for tight spots
The thresholds are adjustable or selectable, so you set the trip points to match the rails you are actually running, not a fixed voltage pair the vendor guessed at. The reset output is active low and open drain — that means you wire a pull-up resistor to the logic rail of the downstream controller, and the supervisor pulls it low when either monitored voltage dips below its threshold. No push-pull contention, no level-shifting needed if the pull-up rail matches the downstream logic.
Temperature range and package — field-fit check
No commercial-grade 0-to-70°C limit here — this part stays reliable when the enclosure is hot. The SOT-23-6 package is a common footprint — 2.9 mm × 1.6 mm, six pins with 0.95 mm pitch. No thermal pad, no exposed paddle to worry about; the junction-to-ambient thermal resistance is manageable for the microwatt-level dissipation of a supervisor.