CD54HCT573F3A

Part of Texas Instruments’ 54HCT military logic series, the CD54HCT573F3A functions as an octal transparent latch with 3-state outputs, moving data from D inputs to Q outputs while the latch-enable (LE) signal is high and holding the last valid state when LE is low. Built on high-speed CMOS (HCT) technology, it delivers LSTTL-compatible speed with CMOS-level power dissipation, and the ceramic dual-in-line (CDIP) package supports operation across the full military temperature range. This device has been officially discontinued by Texas Instruments and is now an end-of-life component with no ongoing factory production.

In defense avionics, radar processing, and industrial control systems where this latch was originally designed in for bus-interface, data-buffering, and status-register tasks, the CD54HCT573F3A remains integral to existing board sets. Replacing an obsolete military-grade logic chip typically triggers costly board respins, requalification cycles, and lengthy recertification timelines—particularly burdensome for platforms with multi-decade field deployment. ZZX Electronics sustains these programs by sourcing legacy stock with full date-code traceability, providing an exact drop-in solution that preserves form, fit, and function without design changes. The part’s mil-spec CDIP packaging and HCT input thresholds continue to meet the original signal-integrity and environmental requirements of high-reliability systems operating well beyond the manufacturer’s active supply window.