SN74ALS251FN

Overview

The SN74ALS251FN is an Advanced Low-Power Schottky (ALS) TTL device manufactured by Texas Instruments. It functions as a single-function, 8-line input to 1-output data selector or multiplexer with three-state outputs. The component operates within a supply voltage range of 4.5 V to 5.5 V and supports a commercial operating temperature range from 0°C to +70°C. It utilizes a 16-pin Small Outline Package (SOIC-16) for surface-mount installation.

Feature Summary

• Provides eight selectable data inputs routed to a single output based on address selection
• Features three-state outputs allowing direct connection to bus systems
• Utilizes Advanced Low-Power Schottky technology for reduced power consumption

Applications

• Data routing in digital communication systems
• Address decoding logic circuits
• Bus line switching applications

Procurement Notes

Verify the specific suffix 'FN' against the manufacturer's current ordering information to confirm package type and tape/reel specifications. Ensure the component meets RoHS compliance requirements if mandated by the project standards. Cross-reference the datasheet revision date to confirm compatibility with existing design documentation.

Selection Notes

Select this component when an 8-to-1 multiplexing function is required within a TTL-compatible system architecture. The ALS series offers a balance between speed and power dissipation suitable for general-purpose digital logic. Consider the three-state output capability if the signal path requires isolation or shared bus connectivity.

Part Context

This part belongs to the SN74ALS family of logic integrated circuits produced by Texas Instruments. The SN74ALS251 specifically addresses multiplexing needs within the broader category of encoders, decoders, and multiplexers. It serves as a standard solution for selecting one of multiple data sources in digital electronic designs.

Replacement Considerations

Compatible substitutes include the SN74ALS251N and SN74ALS251DR. Verify pinout and electrical characteristics match before substitution.