3.5V threshold supervisor for tight-rail monitoring
It asserts a reset output (active-low, open-drain) when the supply drops below 3.5V and holds it low for a typical 40µs after the supply recovers. This part is built for systems that need a clean, fast power-good signal to hold a microcontroller, FPGA, or SoC in reset until the rail is stable — typical in automotive ECUs, industrial controllers, and battery-powered instruments where the 125°C temperature rating covers under-hood or motor-drive environments.
Open-drain output — pull-up voltage flexibility
The open-drain output lets you connect the reset line to any pull-up voltage independent of the monitored supply. If the supervised IC runs on 1.8V logic, pull up to 1.8V; if it's a 5V legacy part, pull up to 5V. No level shifter needed. The output stays active-low during the entire undervoltage condition and the 40µs timeout window, which is short enough to avoid delaying system startup but long enough to filter out most supply glitches from load transients.
6-WSON (1.5x1.5mm) — footprint and thermal handling
The 6-WSON package measures just 1.5x1.5mm — roughly the size of a 0402 resistor. The datasheet recommends a 0.2mm stencil aperture for the pad to avoid solder bridging to the peripheral pins. No via-in-pad required for this low-power device, but a thermal via grid under the pad improves junction-to-board thermal resistance.
For dual-sourcing resilience, the closest functional second-source candidate is the TLV803ED29DBZR (also active-low, open-drain, but with a 2.9V threshold and a 33ms timeout — verify threshold match for your rail).