1.62V threshold supervisor for 1.8V rails
The 1.62V threshold is set for a nominal 1.8V supply — the undervoltage trip point sits about 10% below the rail, which is a typical margin for catching brownout conditions without nuisance resets on normal ripple. The output is active-low push-pull with a minimum reset timeout of 100ms, which gives downstream logic time to stabilise after the supply returns above threshold.
Industrial temperature and SOT-23-5 footprint
The SOT-23-5 package (SC-74A, SOT-753) is a 5-pin surface-mount footprint with 0.95 mm pitch. It routes easily on a 2-layer board and shares a common land pattern across the TPS3123 family, so a threshold variant swap doesn't require a layout change.