CD54HC74F3A

The Texas Instruments CD54HC74F3A is a high-speed CMOS logic dual D-type flip-flop with individual set and reset inputs, designed for positive-edge-triggered operation in demanding digital systems. Fabricated on advanced silicon-gate CMOS technology, it combines the speed of LSTTL with the low power consumption of standard CMOS, operating across a wide supply voltage range typical of the HC family. The 54-series designation confirms a military temperature range of –55 °C to +125 °C, and the ceramic dual-in-line package (CDIP) provides a hermetic seal that ensures long-term reliability in harsh environments. Each flip-flop accepts a data signal at the D input and transfers it to the Q and Q̅ outputs on the rising edge of the clock, while the asynchronous set and reset lines allow direct state control regardless of clock activity.

Typical applications include synchronous data storage, control registers, and clock conditioning circuits within avionics, missile guidance, radar processing, and satellite communication payloads. Its edge-triggered architecture makes it suitable for synchronizing asynchronous signals and implementing shift registers or counters in high-reliability military and aerospace hardware. Industrial systems requiring extended-temperature logic often deploy this device in downhole instrumentation or nuclear controls. From a procurement standpoint, the CD54HC74F3A belongs to a class of logic components with extended product lifecycles supported by Texas Instruments and its authorized distribution partners, minimizing the risk of premature obsolescence. The F3A suffix commonly denotes a specific lead finish or military processing flow, aligning with legacy system maintenance and new designs that demand QML or /883-equivalent screening. Engineers specify this part when hermeticity, guaranteed temperature performance, and long-term traceability are critical requirements.