SN74HCS02/SN74HCS02-Q1 2-Input NOR Gate Texas Instruments SN74HCS02/SN74HCS02-Q1 2-Input NOR Gate contains four independent 2-input NOR Gates with Schmitt-trigger inputs. Each gate performs the Boolean function Y = A + B in positive logic. The Texas Instruments SN74HCS02-Q1 devices are AEC-Q100 qualified for automotive applications.