74AHC1GxxQ & 74AHCT1GxxQ Automotive Gate Logic Diodes Incorporated 74AHC1GxxQ and 74AHCT1GxxQ Automotive Single Gate Logic are designed to buffer, invert or gate, logic signals at a specific point within an application. A logic signal may need to be augmented on Complex telematics, infotainment, or ADAS subsystems to proceed to the next block.