SN74LS156N

Overview

The SN74LS156N is a dual 2-line to 4-line decoder/demultiplexer manufactured by Texas Instruments. It features open-collector outputs and operates within a voltage range of 4.75V to 5.25V. The device utilizes LS logic family technology and is housed in a 16-pin PDIP package. It supports through-hole mounting and includes input clamping diodes for protection.

Feature Summary

• Dual independent 2-to-4 decoding or demultiplexing sections
• Open-collector output configuration for flexible interfacing
• Input clamping diodes integrated for transient protection

Applications

• Digital signal routing
• Address decoding in memory systems
• Demultiplexing data streams

Procurement Notes

Verify the specific manufacturer part number against official Texas Instruments documentation to ensure authenticity. Confirm that the component matches the required LS logic specifications and PDIP package dimensions. Check for RoHS compliance status if environmental regulations apply to your assembly process. Ensure storage conditions align with semiconductor handling guidelines to prevent damage.

Selection Notes

Select this component when dual independent decoding channels are required within a single package. The open-collector outputs allow for wired-AND connections and level shifting capabilities not available with standard TTL outputs. Consider the LS logic speed and power consumption trade-offs compared to other families like HC or HCT for system compatibility.

Part Context

This component belongs to the Texas Instruments SN74LS series, which provides low-power Schottky logic functionality. The SN74LS156 specifically addresses applications requiring dual decoding paths without external gating complexity. It serves as a compact solution for digital control circuits needing efficient address selection or data distribution.

Replacement Considerations

Compatible substitutes include equivalent dual 2-to-4 decoders with open-collector outputs from other manufacturers, provided pinouts and electrical characteristics match. Verify logical function equivalence and output drive capabilities before substitution.