CD74HC251E

Overview

The CD74HC251E is a high-speed CMOS logic device manufactured by Harris Corporation, functioning as an 8-input multiplexer with three-state outputs. It belongs to the HC/UH series and utilizes a 16-pin PDIP package. The component supports a supply voltage range of 2V to 6V and operates within a temperature range of -55°C to 125°C. It features a single circuit configuration with 8-bit width per element.

Feature Summary

• Provides eight selectable data inputs routed to a single output path
• Outputs are controlled via three-state logic for bus isolation
• Constructed using high-speed CMOS technology for low power consumption

Applications

• Data routing in digital communication systems
• Signal selection in microprocessor interfaces
• Multiplexing analog or digital signals for processing

Procurement Notes

Verify manufacturer origin as Harris Corporation, noting potential legacy status. Confirm package type matches 16-pin DIP specifications. Check RoHS compliance status as original Harris parts may not meet current environmental standards. Validate pinout compatibility with target PCB design before integration.

Selection Notes

Select this component when an 8-to-1 multiplexing function with tri-state output control is required. Ensure the operating voltage aligns with the 2V to 6V specification. Consider the through-hole packaging requirement for assembly processes. Verify that the HC series speed and drive capabilities meet system timing constraints.

Part Context

This part is part of the 74HC logic family, widely used for general-purpose digital applications. Harris Corporation was a significant producer of such logic ICs before industry consolidations. The CD prefix indicates commercial grade temperature range extension, while HC denotes high-speed CMOS performance characteristics relative to older logic families.

Replacement Considerations

Texas Instruments CD74HC251M is listed as a parameter-equivalent alternative. Verify functional compatibility and pinout alignment before substitution. Note that Texas Instruments may offer updated manufacturing versions with different suffixes.