Two-rail supervisor in a SOT-23-6 footprint
The open-drain output lets you wire-OR it with other reset sources or level-shift to a different logic voltage.
Threshold flexibility and temperature range
The threshold voltage is adjustable or selectable via external resistors, so you can set the trip point for each monitored rail independently — useful when the core and I/O supplies run at different voltages and need different undervoltage limits.
That means it stays in the BOM for new designs and production runs without a forced migration.