SN74LS157DG4

Overview

The SN74LS157DG4 is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It belongs to the LS-TTL logic family and utilizes Schottky barrier diode processes for high-speed operation. The device features four independent multiplexers sharing common Select and Enable inputs, presenting selected data in non-inverted form at buffered outputs. It operates with a standard 5 V supply voltage and is housed in a 16-pin SOIC package.

Feature Summary

• Integrates four independent 2-input multiplexers within a single integrated circuit
• Utilizes Schottky process technology to ensure high switching speeds
• Provides glitch-free multiplexing through specialized internal circuitry
• Features non-inverting buffered outputs that present true data forms

Applications

• Data selection and routing between two parallel data sources
• Generation of specific Boolean functions from two variables
• Bus switching systems requiring synchronized channel selection
• Address decoding and multiplexing in digital control circuits

Procurement Notes

Verify the manufacturer marking indicates Texas Instruments and confirm the suffix DG4 denotes lead-free composition compliant with RoHS standards. Ensure the package type matches the required surface-mount footprint and validate the operating temperature range against system thermal constraints before finalizing procurement.

Selection Notes

Select this component when TTL-compatible input levels are required alongside high-speed performance. The LS series offers a balance of speed and power consumption suitable for general-purpose digital logic. Consider alternative CMOS variants if lower power dissipation or wider voltage tolerance is necessary for the target application environment.

Part Context

This part is a specific variant of the SN74LS157 logic family, distinguished by its surface-mount packaging and environmental compliance markings. It serves as a standard MSI component for managing multiple data streams in synchronous digital systems, widely utilized in legacy and modern industrial control architectures requiring reliable signal routing.

Replacement Considerations

Compatible substitutes include SN74LS157D and SN74LS157N. Verify pinout compatibility and electrical specifications match exactly when replacing components in existing designs.