CD54HCT393F3A

The Texas Instruments CD54HCT393F3A is a dual 4-stage binary ripple counter fabricated in the high-speed CMOS HCT logic family, supplied in a hermetically sealed ceramic dual-in-line package (CDIP) for military and high-reliability environments. This device contains two independent counter stages, each advancing on a negative clock transition with a dedicated reset, and it operates from a nominal 5 V rail while providing TTL-compatible input thresholds. The 54-series prefix guarantees compliance with full military temperature range (−55 °C to +125 °C) and controlled baseline processing, and the ceramic DIP construction delivers exceptional resistance to thermal cycling, humidity, and shock.

Typical applications include frequency division, event counting, and timing generation in avionics computers, radar processing units, satellite telemetry systems, and ruggedized industrial controllers where deterministic logic behavior must be sustained across decades-long deployment cycles. The HCT input compatibility allows direct interface with TTL or LVTTL control signals without level translation, while inherent latch-up immunity and high noise margins support operation in electrically noisy enclosures. From a procurement perspective, the CD54HCT393F3A resides in Texas Instruments' high-reliability portfolio and can carry export control classifications, extended lead times, and minimum order quantities. Although not formally obsolete, mature CMOS logic families are subject to lifecycle management, and long-term program requirements warrant monitoring of product change notifications and authorized distribution channels. The through-hole ceramic DIP form factor also aligns with legacy systems that mandate socketed assembly, maintainability, and strict control of tin-whisker mitigation for aerospace and defense standards.