Supply range and noise immunity
The SN74HCS02BQAR: The 2V to 6V supply range lets this gate bridge 3.3V and 5V logic domains without an external level shifter, simplifying the BOM. The Schmitt-trigger inputs accept slow edges (e.g., from RC debounce circuits or long PCB traces) without oscillation, with a typical hysteresis of several hundred millivolts. Quiescent current maxes at 2 µA, so it adds negligible standby draw in battery-backed systems.
The SN74HCS02BQAR is an active, ROHS3-compliant part from TI's 74HCS series.