CD74HCT4351E

Overview

The CD74HCT4351E is a single-pole octal-throw analog switch manufactured by Harris Corporation, belonging to the HCT logic series. It functions as an 8-channel multiplexer or demultiplexer with address latches. The device operates on a single supply voltage ranging from 2V to 6V and supports a maximum frequency of 38MHz. It utilizes a 16-pin DIP package for through-hole mounting. The component features CMOS technology and includes clamp diodes on inputs to allow interfacing with voltages exceeding VCC when current-limiting resistors are used.

Feature Summary

• Provides eight independent analog switch channels controlled by three digital select inputs
• Integrates address latches to maintain selected channel state without continuous input signals
• Includes built-in 'break before make' switching action to prevent signal overlap during transitions
• Features input clamp diodes enabling safe interface with analog signals outside the power supply range

Applications

• Analog multiplexing and demultiplexing in data acquisition systems
• Digital signal routing and gating applications
• Logic level translation between 5V logic and ±5V analog signals

Procurement Notes

Verify manufacturer authenticity as Harris Corporation assets were acquired by Texas Instruments. Confirm RoHS compliance status, as original Harris variants may not meet current environmental standards. Check for obsolete part status and availability through authorized distributors or surplus suppliers. Ensure the specific suffix matches required packaging and temperature ratings.

Selection Notes

Select this component when an 8-channel analog switch with latched addressing is required within the HCT logic family. Ensure the operating voltage range of 2V to 6V aligns with system requirements. Consider the 38MHz maximum frequency limit for high-speed signal routing. Verify that the 16-pin DIP package fits the target PCB layout constraints.

Part Context

This component is part of the 74HC/HCT series of integrated circuits, widely used for general-purpose logic and analog switching functions. The HCT variant ensures compatibility with TTL logic levels while maintaining CMOS low power consumption characteristics. It serves as a bridge between digital control systems and analog signal paths.

Replacement Considerations

Compatible substitutes include the Nexperia 74HC4351 and 74HCT4351, which offer identical pinouts and functional specifications. Texas Instruments equivalents such as the CD74HC4351 or CD74HCT4351 provide direct replacements with potentially updated manufacturing processes and compliance certifications.