What this battery monitor does — and doesn't
The MAX6427DHUR+ is a low-power, single-level battery monitor from Maxim Integrated, designed to supervise a single-cell Lithium Ion or Polymer pack and assert an alert when the voltage crosses a factory-set threshold. It is not a fuel gauge — there is no coulomb counting or remaining-capacity reporting. It is a simple voltage monitor that pulls an output low when the cell drops below its trip point, suitable for undervoltage lockout or low-battery warning in portable equipment.
Supplied in a SOT-23-3 package (also listed as TO-236-3 or SC-59), this is a three-pin surface-mount device with a standard 2.9 mm × 1.3 mm body and 0.95 mm pitch. No thermal pad, no exposed paddle — just three solder joints and a small PCB footprint. The shipping form is Bulk (tube or loose parts), not Tape & Reel, so factor that into your pick-and-place setup or plan a tube-to-reel transfer for volume assembly.