SN74ALS157ANS

Overview

The SN74ALS157ANS is a quad 1-of-2 data selector/multiplexer from the Texas Instruments ALS logic series. It features four independent multiplexers in a single package, providing true outputs for each channel. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports surface-mount installation in an SOIC-16 package. It functions as a high-speed digital component with a propagation delay of 14 ns, suitable for applications requiring efficient data routing and signal selection in standard 5V logic systems.

Feature Summary

• Integrates four independent 2-to-1 multiplexers into a single integrated circuit package
• Provides true output signals for selected input channels without inversion
• Operates reliably within a standard 5V power supply environment

Applications

• Digital data routing and signal selection circuits
• Address decoding and memory access control
• General-purpose logic switching applications

Procurement Notes

Verify the specific suffix 'N' indicates a non-recommended or legacy status compared to the 'NSR' variant. Confirm package dimensions match the SOIC-16 specification. Ensure compatibility with existing board layouts designed for through-hole or specific surface-mount footprints if substituting from other variants. Check RoHS compliance documentation for manufacturing date codes.

Selection Notes

Select this component when four independent 2-to-1 multiplexing functions are required in a compact form factor. Consider the ALS series speed and power characteristics against system requirements. Verify that the SOIC-16 package fits the available PCB space. Compare performance metrics such as propagation delay and supply voltage tolerance with alternative logic families if higher speed or lower power is needed.

Part Context

This part belongs to the SN74ALS157A family of multiplexers manufactured by Texas Instruments. It is part of the broader 74-series logic ecosystem, specifically the Advanced Low-power Schottky (ALS) category. The 'N' suffix typically denotes a specific package or processing variation within the manufacturer's lineup, distinguishing it from tape-and-reel versions like the NSR.

Replacement Considerations

The SN74ALS157ANSR is a direct functional equivalent in the same SOIC-16 package but supplied in tape-and-reel format. Other ALS series multiplexers may offer similar functionality but require verification of pinout compatibility and electrical specifications before substitution.