What this part does
The Maxim Integrated MAX6431DHUS-T is a multi-chemistry battery monitor designed for 2-cell battery packs. It monitors cell voltage and provides an alert or control signal when thresholds are crossed — typical for over-discharge protection or low-battery warning in portable equipment. The industrial temperature grade (-40°C to 85°C) suits outdoor, automotive cabin, or factory-floor applications where the battery pack sees ambient extremes.
Package and mounting
Housed in a SOT-23-4 package, surface-mount only. The four-pin footprint is small enough for tight PCB layouts in handheld or embedded battery management boards.
Lifecycle and compliance
One important caveat: the part is RoHS non-compliant. If your BOM must meet EU RoHS or similar restricted-substance directives, this part will not pass. For legacy or exempt applications, that is not a blocker.
