SN74LS158D

Overview

The SN74LS158D is a quadruple 2-line to 1-line data selector/multiplexer from the Texas Instruments SN74LS series. It integrates four independent multiplexers in a single SOIC-16 package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to +70°C. Key electrical characteristics include a propagation delay of 32 ns and a maximum power dissipation of 24 mW.

Feature Summary

• Integrates four independent 2-to-1 multiplexers for compact signal routing
• Compatible with standard TTL logic families for system integration
• Provides direct access to selected input lines via control signals

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 'D' confirms the SOIC-Narrow-16 surface-mount package. Confirm RoHS compliance status through official documentation, as legacy LS parts may have varying environmental declarations. Check current production status, as some LS variants are obsolete or subject to last-time buys.

Selection Notes

Select this component when low-cost TTL compatibility is required for quad multiplexing. Ensure the 5V-only operation and commercial temperature range meet design constraints. Consider SN74ALS158D for faster switching speeds or SN74HC158D for wider voltage tolerance if specifications allow.

Part Context

This part belongs to the SN74LS (Low-power Schottky) family, known for balanced speed and power consumption. It serves as a functional equivalent to other quad multiplexers like the SN74LS157, differing primarily in pinout and internal gating structure. The D package denotes a plastic small-outline integrated circuit.

Replacement Considerations

SN74ALS158D offers improved speed performance while maintaining pin compatibility. SN74HC158D provides CMOS advantages with broader voltage ranges but requires level shifting for direct TTL interfacing.