Quad 2-input NOR gate with Schmitt-trigger inputs for automotive and industrial logic
The Texas Instruments SN74HCS02QDRQ1 is a quad 2-input NOR gate from the 74HCS family, featuring Schmitt-trigger inputs on all four gates. It is qualified to AEC-Q100 (automotive grade) and operates over the full –40°C to 125°C temperature range, making it suitable for under-hood electronics, industrial motor drives, and outdoor telecom where noise on logic lines is a concern. The wide supply range of 2V to 6V lets it work directly from 3.3V or 5V rails without external level shifters.
Supply voltage and logic levels — what they mean for your rail
Rated for 2V to 6V, this gate accepts standard CMOS and TTL levels across its range. The low-level input threshold spans 1V to 3V, and the high-level threshold spans 1.5V to 4.2V, depending on supply. At 5V operation, the 12ns propagation delay (into 50pF load) is fast enough for most automotive sensor interfaces and control logic without needing a faster (and pricier) LVC or AHC family part.
AEC-Q100 qualification and temperature range
The AEC-Q100 qualification (documented in the series Automotive, AEC-Q100, 74HCS) means this part has passed the stress tests required for automotive-grade ICs: high-temperature operating life, temperature cycling, and ESD robustness. The –40°C to 125°C operating range covers the full automotive under-hood and chassis domain, as well as industrial enclosures that see wide ambient swings. For a BOM line that needs a qualified NOR gate, this part removes the need for a separate qualification run.
Lifecycle and sourcing reality
No LTB risk for new designs.