SN74ALS157ADR

Overview

The SN74ALS157ADR is a quad 1-of-2 data selector/multiplexer from the Texas Instruments ALS logic series. It features four independent multiplexers, each selecting one of two data inputs based on a common select line. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports surface-mount installation in an SOIC-14 package. Key electrical parameters include a propagation delay of 14 ns, a low-level output current of 8 mA, and a high-level output current of -400 µA. It functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Integrates four independent 2-to-1 multiplexers with a common select input for efficient data routing.
• Provides active-low outputs compatible with standard TTL and CMOS logic families.
• Features high-speed switching capabilities suitable for demanding digital applications.

Applications

• Data routing in digital communication systems
• Address decoding in microprocessor-based designs
• Signal selection in test and measurement equipment

Procurement Notes

Verify the specific suffix 'ADR' against the manufacturer's official documentation to confirm the tape-and-reel packaging configuration and ensure it matches the intended automated assembly process. Confirm that the ALS logic family specifications align with the target system requirements before finalizing procurement.

Selection Notes

Select this component when a compact solution for multiple signal paths is required. The ALS series offers a balance of speed and power consumption. Ensure the design accommodates the specified voltage limits and thermal conditions for reliable operation in industrial environments.

Part Context

This part belongs to the SN74ALS157A family of multiplexers. It serves as a surface-mount alternative to through-hole variants, facilitating modern PCB assembly techniques while maintaining functional compatibility with legacy 74-series logic standards.

Replacement Considerations

Cross-reference with SN74ALS157AD for tube-packaged equivalents or SN74ALS157ANSR for reel-based alternatives from the same manufacturer. Verify pinout and electrical characteristics match before substitution.