0.9V threshold — why it matters for low-voltage rails
The TPS3839A09DBZT monitors a single supply rail and asserts a reset when the voltage drops to 0.9V. That threshold is designed for 1.8V or 1.2V core supplies — the supervisor catches a brownout before the logic rails collapse into undefined states. The reset output is active-low push-pull, so it drives the reset pin of an MCU or FPGA directly without needing an external pull-up resistor. The 120ms minimum timeout holds the reset long enough for the supply to settle after power-up or a glitch.
Package and temperature range for the board
Housed in a 3-pin SOT-23-3, the footprint is compact — about 2.9 mm × 1.3 mm — and routes easily on two-layer boards. The part is ROHS3 compliant.
The part can be ordered in tape-and-reel or cut-tape quantities.