CD54HCT85F3A

Comparators Overview

The CD54HCT85F3A is a 4-bit magnitude comparator from the HCT series, manufactured by Harris Corporation. It features true outputs and utilizes CMOS technology within a ceramic metal-sealed cofired (CDIP16) package. The device operates with a supply voltage range of 4.5 V to 5.5 V, typically at 5 V. It supports an extended temperature range from -55 °C to 125 °C and exhibits a propagation delay of 60 ns. The component is designed for cascaded applications and is classified as military grade.

Comparators Feature Summary

• Provides 4-bit magnitude comparison with true output polarity
• Supports cascading for multi-bit expansion
• Operates in extreme temperature environments up to 125 °C
• Utilizes HCT logic compatibility with CMOS technology

Comparators Applications

• Digital magnitude comparison circuits
• Military-grade electronic systems
• Cascaded comparator arrays
• Industrial control logic interfaces

Comparators Procurement Notes

Verify the manufacturer designation as Harris Corporation or its successor entities such as Intersil or Microchip, depending on production era. Confirm the specific suffix F3A corresponds to the CDIP16 ceramic package variant. Ensure the component meets military temperature specifications (-55 °C to 125 °C) if required for the application environment. Cross-reference datasheets for propagation delay and supply voltage tolerances to ensure compatibility with system requirements.

Comparators Selection Notes

Select this component when a 4-bit magnitude comparator with true outputs is required for high-reliability applications. The HCT series ensures compatibility with standard TTL logic levels while maintaining CMOS power efficiency. The ceramic package offers superior thermal and mechanical stability compared to plastic variants, making it suitable for harsh environments. Verify that the 60 ns propagation delay meets the timing constraints of the target circuit design.

Comparators Part Context

This component belongs to the Harris CD54HCT family of high-speed CMOS logic devices. The CD54 prefix indicates military-grade qualification and extended temperature operation. The HCT series denotes compatibility with HC logic speeds but with TTL-compatible input thresholds. The 85 function code specifically identifies the 4-bit magnitude comparator architecture within this product line.

Comparators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult official manufacturer cross-reference guides for equivalent components from Harris, Intersil, or Microchip Semiconductor.