CD54HCT173F3A

Overview

The CD54HCT173F3A is a high-speed CMOS logic quad D-type flip-flop manufactured by Harris Corporation. It features four independent positive-edge triggered D flip-flops with three-state outputs, housed in a ceramic dual in-line package (CDIP-16). The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -55 °C to +125 °C. Key electrical specifications include a propagation delay of 40 ns, a maximum output current of 6 mA, and a load capacitance rating of 50 pF.

Feature Summary

• Quad D-type flip-flop architecture with positive edge triggering
• Three-state outputs for bus-oriented applications
• TTL-compatible inputs for direct interface with TTL systems
• Ceramic dual in-line packaging designed for military-grade reliability

Applications

• Military aerospace data storage systems
• High-reliability industrial control registers
• Avionics signal processing circuits
• Harsh environment communication equipment

Procurement Notes

Verify the manufacturer origin carefully, as Texas Instruments also produces this part number. Confirm that the specific unit received matches the Harris Corporation specification sheet rather than the TI datasheet. Ensure the ceramic package integrity is intact and check for proper marking codes corresponding to the original Harris production batch to avoid counterfeit or misidentified components.

Selection Notes

Select this component when designing systems requiring strict military temperature ranges and radiation-hardened ceramic packaging. The HCT series ensures compatibility with standard TTL logic levels while providing the speed advantages of CMOS technology. Consider the physical size constraints of the CDIP-16 package and verify that the circuit design accommodates the specific power dissipation characteristics of the ceramic housing.

Part Context

This component belongs to the CD54 family of high-speed CMOS logic devices originally developed by Harris Semiconductor. The '54' prefix indicates a military-grade temperature range and stricter manufacturing tolerances compared to commercial parts. The HCT suffix denotes High-speed CMOS with TTL-compatible input thresholds, allowing seamless integration into existing digital logic architectures without level shifting requirements.

Replacement Considerations

Public confirmed substitute part numbers: CD54HCT173F3AT, CD54HCT173F3A/883.