CD74HC251EG4

Overview

The CD74HC251EG4 is a high-speed CMOS logic component manufactured by Texas Instruments. It functions as an 8-input multiplexer with three-state outputs, housed in a 16-pin SOIC package. The device operates within a supply voltage range of 2V to 6V and supports an operating temperature range from -55°C to +125°C. Key electrical characteristics include a load capacitance of 50 pF and a maximum output current of 7.8 mA. It complies with RoHS standards and features a moisture sensitivity level of 1.

Feature Summary

• Provides eight selectable data inputs routed to a single output line based on address selection.
• Features three-state outputs that allow connection to shared bus structures without signal contention.
• Constructed using high-speed CMOS technology for low power consumption and fast switching speeds.

Applications

• Data routing in digital communication systems
• Address decoding for memory or peripheral selection
• Signal path switching in test and measurement equipment

Procurement Notes

Verify the specific suffix 'G4' indicates lead-free composition and environmental compliance per manufacturer documentation. Confirm the package type matches the required PCB footprint. Ensure the operating temperature range meets system requirements. Check for any recent product change notices regarding pinout or electrical specifications before finalizing procurement.

Selection Notes

Select this component when an 8-to-1 data selector with tri-state capability is required. It is suitable for applications needing wide voltage operation and extended temperature ranges. Compare propagation delay and output drive strength against other logic families if speed or load driving is critical. Ensure input voltage levels are compatible with the system logic family.

Part Context

This part belongs to the Texas Instruments CD74HC series of high-speed CMOS logic devices. It is functionally similar to the standard 74HC251 but includes specific manufacturing revisions indicated by the suffix. The device is designed for general-purpose digital logic applications requiring reliable data selection and bus interfacing capabilities.

Replacement Considerations

Direct replacements include SN74HC251DBR and CD74HC251M96E4. Verify pin compatibility and electrical parameters before substitution. Alternative packages such as SSOP may require adapter considerations.