74HCT85D,653

Comparators Overview

The Nexperia 74HCT85D,653 is a 4-bit magnitude comparator housed in a 16-SO package. It compares two 4-bit binary or BCD codes to output A>B, A=B, and A<B results. The device operates on a supply voltage of 4.5 V to 5.5 V with active high outputs. It features TTL input levels, latch-up performance exceeding 100 mA per JESD 78 Class II Level B, and ESD protection exceeding 2000 V (HBM). Operating temperatures range from -40 °C to +125 °C.

Comparators Feature Summary

• Performs comparison of two 4-bit binary, BCD, or monotonic codes
• Provides three magnitude result outputs for A>B, A=B, and A<B conditions
• Supports expansion to arbitrary word lengths via cascading capabilities
• Includes input clamp diodes for interfacing with voltages exceeding VCC

Comparators Applications

• Process controllers
• Servo-motor control systems
• Digital logic circuits requiring magnitude comparison

Comparators Procurement Notes

Verify the specific suffix against official Nexperia documentation to confirm pinout and electrical characteristics match project requirements. Confirm RoHS compliance status through current datasheets. Ensure ordering quantities align with distributor availability and standard packaging formats. Validate that the 16-SO package dimensions fit the designated PCB footprint constraints before finalizing procurement decisions.

Comparators Selection Notes

Select this component when TTL-compatible inputs are required for 4-bit magnitude comparison within a 5 V logic system. Choose over HC variants if noise immunity and speed at 5 V are prioritized over lower power consumption. Ensure the application does not require analog signal processing, as this is a digital logic device. Verify thermal management needs for operation up to +125 °C.

Comparators Part Context

This part belongs to the 74HCT series of high-speed CMOS logic devices manufactured by Nexperia. It functions as a fundamental building block for arithmetic logic units and control systems. The device is designed to interface directly with TTL logic families while maintaining CMOS noise immunity standards. It represents a standard solution for discrete magnitude comparison tasks in embedded electronics.

Comparators Replacement Considerations

Public confirmed substitute part numbers include 74HC85D,653 for HC-series compatibility and generic equivalents like MC74HC85ADR2G. Verify pin compatibility and electrical specifications before substitution.

Comparators FAQ

How should the expander inputs be connected for proper comparison operation?

For proper compare operation, connect I_A<B and I_A>B to LOW, and I_A=B to HIGH.

What is the maximum latch-up performance rating?

The latch-up performance exceeds 100 mA per JESD 78 Class II Level B.