Three-rail supervisor in a five-pin SC-70
The Maxim Integrated MAX6743XKZWD3+ is a three-channel multi-voltage supervisor that keeps an eye on up to three supply rails and pulls the reset line low when any of them drops below its threshold. It monitors fixed thresholds of 1.665 V and 2.313 V plus one adjustable input, so you can set the third trip point with an external resistor divider. The push-pull, active-low output holds the system in reset for a minimum of 150 ms after all rails return to tolerance, giving the power supplies and oscillator time to settle before the processor starts executing code.
Package and mounting: SC-70-5
The SC-70-5 package (SOT-353) is a five-lead surface-mount package. It fits a standard footprint and reflows without special handling.
Temperature grade and environment
Rated for -40°C to 85°C ambient, this supervisor covers industrial control, outdoor telecom, base-station equipment, and automotive cabin applications (though it is not AEC-Q100 qualified). The operating range is wide enough for most embedded systems that live inside an enclosure or on a PCB exposed to seasonal temperature swings.
Sourcing and lifecycle
For BOM planning, this part is a safe choice for new designs and ongoing production without near-term obsolescence risk.