SN74AS157NSR

Overview

The SN74AS157NSR is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It belongs to the AS (Advanced Schottky) logic series, providing high-speed performance with a typical propagation delay of 4.5 ns. The device operates on a single supply voltage ranging from 4.5 V to 5.5 V and features four independent multiplexing circuits. It is housed in a 16-pin SOIC package and supports surface-mount installation. The component includes active-low outputs and an active-low enable input for controlling data selection across the four channels.

Feature Summary

• Provides four independent 2-to-1 multiplexing circuits for parallel data routing
• Features Advanced Schottky technology for high-speed switching capabilities
• Includes an active-low enable input to control data flow
• Delivers active-low outputs for direct interface compatibility

Applications

• High-speed data routing in digital systems
• Signal selection in communication equipment
• Data bus switching applications
• Industrial control system signal management

Procurement Notes

Verify the specific suffix 'NSR' corresponds to the SOIC-16 package and tape-and-reel packaging configuration as documented in official Texas Instruments datasheets. Confirm RoHS compliance status through current manufacturer documentation, as environmental declarations may change. Ensure the ordering part number matches the exact functional specification required for your design, as minor suffix variations can indicate different packaging or temperature grades.

Selection Notes

Select this component when high-speed data multiplexing is required within standard TTL voltage levels. The AS series offers significantly faster propagation delays compared to standard LS or ALS families. Consider the 16-pin SOIC package constraints for PCB layout. Verify that the 4.5V to 5.5V operating range aligns with your system power supply. This device is suitable for applications demanding low noise immunity and fast switching speeds.

Part Context

The SN74AS157NSR is part of the Texas Instruments SN74AS family, which utilizes Advanced Schottky technology to balance speed and power consumption. It serves as a high-performance alternative to slower logic families like SN74LS or SN74ALS. The 'NSR' designation specifically identifies the non-voltage version in a shrink-small-outline package supplied in reel format for automated assembly processes.

Replacement Considerations

Compatible substitutes include the SN74AS157N (DIP package) or SN74AS157DR (SOIC package from other manufacturers). Cross-reference with SN74F157 for similar functionality, though note differences in propagation delay and drive strength. Verify pinout compatibility before substitution.