Quad 2-input XNOR gate for automotive logic — what it is, what it does
The Texas Instruments SN74HCS7266QPWRQ1 is a quad 2-input XNOR (exclusive NOR) gate from the Automotive, AEC-Q100 qualified 74HCS logic family. Each of the four independent circuits performs the Boolean XNOR function: output is high when both inputs are equal. The Schmitt-trigger inputs provide noise immunity on slowly changing or noisy signals, making the part suitable for sensor interfaces, switch debouncing, and control logic in automotive body electronics, powertrain, and industrial environments where signal integrity matters. Operating from 2V to 6V supply and rated for -40°C to 125°C ambient temperature, it fits under-hood and cabin applications without derating.
Key specs and what they mean for the BOM
The supply range spans 2V to 6V, covering both 3.3V and 5V logic rails common in automotive ECUs. Quiescent current is 2 µA maximum — negligible in battery-backed or always-on modules. Output drive is 7.8 mA sink and source at rated conditions, enough to drive downstream CMOS logic inputs or low-power LEDs directly. Propagation delay is 16 ns at 6V, 50 pF load — fast enough for control loops and state machines running at moderate clock speeds. The 14-TSSOP package (4.40 mm body width) is a standard footprint for automotive mixed-signal boards.
Mounting and integration notes
Surface-mount 14-TSSOP package, 0.173" (4.40 mm) body width. The supplier device package is 14-TSSOP. Tape & Reel (TR) and Cut Tape (CT) options are listed — the TR quantity suits automated pick-and-place for production runs; CT is for prototypes or small builds. No special thermal management is needed; the 2 µA quiescent current keeps self-heating negligible across the temperature range.