CD74HCT251E

Overview

The CD74HCT251E is a high-speed CMOS logic device manufactured by Texas Instruments, functioning as an 8-input multiplexer with three-state outputs. It operates within a supply voltage range of 4.5 V to 5.5 V and supports data rates up to 30 MHz. The component utilizes a 16-pin DIP package and is designed for industrial temperature ranges spanning from -55°C to +125°C. It features low power consumption typical of CMOS technology and includes standard TTL-compatible inputs.

Feature Summary

• Provides eight selectable data inputs routed to a single output based on address selection
• Outputs are three-state capable, allowing direct connection to bus systems
• Compatible with standard TTL logic levels for input signals
• Operates reliably across extended industrial temperature conditions

Applications

• Data routing in digital communication systems
• Address decoding circuits
• Signal switching in test and measurement equipment
• Parallel-to-serial conversion modules

Procurement Notes

Verify the specific suffix 'E' indicates the 16-pin DIP package variant when ordering. Confirm RoHS compliance status for current production lots. Ensure the supplier provides official datasheets matching the CDx4HC(T)251 family specifications. Check for any recent product change notices regarding pinout or electrical characteristics updates.

Selection Notes

Select this component when an 8-channel multiplexer with three-state outputs is required. It is suitable for applications needing TTL compatibility and wide operating temperature ranges. Consider the HC series for lower power consumption or AC series for higher speed if performance requirements exceed HCT capabilities. Verify package availability matches the design constraints.

Part Context

This part belongs to the Texas Instruments CD74HCT251 family of high-speed CMOS logic devices. It is functionally similar to other 8-input multiplexers like the CD74HC251 but offers TTL-compatible inputs. The E suffix typically denotes the plastic dual-in-line package format. It is part of a broader line of signal switching components used in digital logic designs.

Replacement Considerations

Direct substitutes include CD74HC251E for HC series compatibility and CD74HCT251M96 for SOIC package alternatives. Verify pinout compatibility before substitution. Check electrical parameters such as propagation delay and output drive current to ensure they meet system requirements.