SN74LS157N

Overview

The SN74LS157N is a quad 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It operates within the LS-TTL logic family and accepts a supply voltage of 5 V. The device features four independent circuits, each with two inputs and one output, housed in a 16-pin plastic DIP package. Key electrical parameters include a maximum low-level output current of 0.008 A and an operating temperature range up to 70 °C.

Feature Summary

• Provides four independent multiplexing channels for routing data from two sources to four outputs.
• Delivers true data outputs without inversion for direct signal interfacing.
• Includes a separate strobe (enable) input to control data selection activity.

Applications

• Routing digital signals between multiple data sources and processing units
• Implementing parallel-to-serial conversion stages in communication systems
• Selecting specific data lines within microprocessor-based control architectures

Procurement Notes

Verify that the component matches the exact SN74LS157N designation, as suffixes may indicate different packaging or environmental compliance. Confirm the manufacturer origin, noting NXP also produces this part number. Check RoHS status, as original versions may not comply with modern environmental directives. Ensure the package type corresponds to the required through-hole mounting specifications.

Selection Notes

Choose this component when TTL-compatible logic levels are required for system integration. The LS-TTL series offers a balance of speed and power consumption suitable for general-purpose digital applications. Consider the 16-pin DIP form factor if prototyping or maintaining legacy through-hole designs. Evaluate the 5 V supply requirement against available system power rails before implementation.

Part Context

This device belongs to the standard 74-series logic family, specifically the Low-power Schottky (LS) variant. It serves as a fundamental building block for digital data routing tasks. The SN74LS157N is functionally compatible with other 74LS multiplexers, allowing for flexible design options in complex digital circuitry requiring signal selection capabilities.

Replacement Considerations

SN74LS157AN