CD74HC High-Speed CMOS Logic Variants

The CD74HC family from Texas Instruments is a high-speed CMOS logic line that provides familiar 74-series functions under TI's CD74 naming. It includes NAND and NOR gates, inverters, AND/OR gates, decoders, counters, multiplexers, latches, flip-flops, shift registers, and bus-interface devices. These parts are often found in industrial boards, test equipment, appliances, and legacy products that need 5 V-capable CMOS logic with established pinouts.

CD74HC variants generally target low static power and operation across a 2 V to 6 V class supply range, though the exact electrical limits depend on the device. DIP packages remain useful for maintenance, education, fixtures, and socketed products, while SOIC and TSSOP variants support production assemblies. The family is frequently evaluated alongside SN74HC and HCT variants depending on input threshold requirements and sourcing availability.

Before substituting a CD74HC device, confirm the logic function, pinout, CMOS input threshold, propagation delay, output drive, operating temperature, and package suffix. If the driving signal comes from TTL logic, a CD74HCT or SN74HCT equivalent may be more appropriate than HC. Octatronics organizes CD74HC ordering codes to simplify comparison across package and stock options.