SN74LS156NSR

Overview

The SN74LS156NSR is a dual 2-line to 4-line decoder and demultiplexer manufactured by Texas Instruments. It operates within the LS logic series and features an SOIC-16 surface-mount package. The device supports a supply voltage range of 4.75 V to 5.25 V and functions at temperatures between 0°C and +70°C. Key electrical characteristics include a propagation delay of 27 ns, a low-level output current of 24 mA, and a high-level output current of -1.2 mA.

Feature Summary

• Dual independent decoding or demultiplexing channels
• Individual strobe inputs for simplified cascading
• Open-collector outputs

Applications

• Dual 2-to 4-Line Decoding
• Dual 1-to 4-Line Demultiplexing
• 3-to 8-Line Decoding via cascading

Procurement Notes

Verify the specific suffix against official documentation to confirm pinout and electrical specifications. Ensure the SOIC-16 package matches the target PCB footprint. Confirm RoHS compliance status through the manufacturer's latest environmental declaration before finalizing procurement.

Selection Notes

Select this component when dual independent decoding or demultiplexing is required in space-constrained designs. The open-collector outputs allow for wired-AND configurations and interfacing with higher voltage loads. Verify that the 27 ns propagation delay meets the system timing requirements.

Part Context

This part belongs to the SN74LS family of logic integrated circuits. It provides dual-channel functionality within a single compact package. The device is designed for general-purpose digital logic applications requiring reliable decoding or data distribution.

Replacement Considerations

Check for SN74LS156N (DIP) or SN74LS156DR (SOIC-16) as potential alternatives. Verify compatibility regarding package type and electrical parameters before substitution.