SN74LS157NG4

Overview

The SN74LS157NG4 is a quadruple 2-input data selector/multiplexer manufactured by Texas Instruments. It belongs to the 74LS logic family, utilizing Low-Power Schottky (LSTTL) technology for high-speed operation. The device features four independent multiplexers with common select and enable inputs. It operates within a supply voltage range of 4.75 V to 5.25 V. The propagation delay is typically 21 ns. The component is housed in a 16-pin PDIP package and supports an operating temperature range from 0°C to +70°C.

Feature Summary

• Quad 2-input multiplexer architecture with common select and enable lines
• High-speed operation enabled by Low-Power Schottky process
• Non-inverting outputs presenting selected data in true form
• Input clamp diodes included to limit high-speed termination effects

Applications

• Data routing between multiple sources to a single destination
• Generation of specific logic functions of two variables
• Glitch-free multiplexing in digital systems

Procurement Notes

Verify the manufacturer marking matches Texas Instruments specifications. Confirm the part number suffix 'G4' indicates lead-free compliance and RoHS status. Ensure the package type corresponds to the required 16-pin DIP configuration for your PCB layout. Check datasheet revisions for any updates on electrical characteristics or recommended operating conditions before finalizing procurement.

Selection Notes

Select this component when LSTTL compatibility is required for existing TTL-based designs. It is suitable for applications needing quad 2-to-1 multiplexing without inversion. Consider alternative CMOS families like HC or AC if lower power consumption or wider voltage ranges are necessary. Verify that the 5V supply constraint aligns with the system's power distribution network.

Part Context

This component is part of the standard 74LS series of logic integrated circuits. It serves as a fundamental building block for digital signal processing and control logic. The LS157 is widely used in legacy and industrial systems requiring reliable, high-speed switching between data paths. Its pinout is compatible with other manufacturers' equivalents in the same logic family.

Replacement Considerations

Compatible substitutes include SN74LS157D and MC74LS157N. These parts share identical logical functionality and pin configurations. Verify that replacement components meet the same voltage and temperature specifications.