SN74LS157DRG4

Overview

The SN74LS157DRG4 is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It belongs to the 74LS series of logic integrated circuits and utilizes CMOS technology. The device features four independent multiplexers, each capable of selecting one of two data inputs based on a common select line. It operates within a supply voltage range of 2 V to 6 V and supports surface mount mounting in a 16-SOIC package. The component is designed for applications requiring parallel-to-serial conversion or data routing.

Feature Summary

• Quadruple configuration providing four independent 2-to-1 multiplexing channels
• Common select input controls all four multiplexers simultaneously
• CMOS construction ensures low power consumption relative to standard TTL
• Surface-mountable design compatible with automated assembly processes

Applications

• Data routing in digital communication systems
• Parallel-to-serial data conversion interfaces
• Microprocessor system address/data bus selection
• Instrumentation signal switching

Procurement Notes

Verify the specific suffix 'DRG4' corresponds to the reel packaging format and RoHS compliance status as defined by Texas Instruments. Confirm the operating temperature range matches your environmental requirements, noting that LS series devices typically have a commercial grade range. Ensure the SOIC-16 footprint aligns with your PCB layout specifications before finalizing procurement orders.

Selection Notes

Select this component when multiple independent 2-to-1 data paths are required within a single package. Consider the propagation delay characteristics typical of the LS series for timing-sensitive designs. Evaluate the power dissipation constraints against the expected load current. Verify compatibility with the system's logic voltage levels and noise immunity requirements compared to HC or HCT alternatives.

Part Context

This part is part of the widely adopted 74xx logic family, specifically the Low-power Schottky (LS) variant. The SN74LS157 serves as a fundamental building block for digital logic design, offering reliable multiplexing capabilities. Its widespread use stems from its standardized pinout and compatibility with various digital systems, making it a common choice for legacy and modern mixed-signal designs.

Replacement Considerations

Compatible substitutes include SN74LS157N for through-hole applications and SN74HCT157DR for high-speed CMOS performance with TTL-compatible inputs. Verify pinout compatibility and electrical characteristics such as propagation delay and output drive strength when substituting. Ensure the replacement part meets the same voltage and temperature specifications.