SN74ALS156DE4

Overview

The SN74ALS156DE4 is a dual 1-line to 4-line decoder/demultiplexer manufactured by Texas Instruments. It features open-collector outputs and individual strobes for each decoder section. The device operates within a supply voltage range of 4.5 V to 5.5 V. It supports a low-level output current of 8 mA and a high-level output current of 100 µA. The component is housed in a 16-SOIC package with a width of 3.90 mm. It functions as an independent circuit suitable for surface mount applications.

Feature Summary

• Dual configuration providing two independent 1-to-4 decoding sections
• Open-collector output structure allowing flexible interfacing
• Individual strobe inputs for precise control of each decoder channel

Applications

• Data routing and distribution systems
• Address decoding in memory architectures
• Control signal generation for peripheral devices

Procurement Notes

Verify the obsolete status of this specific part number before procurement planning. Confirm availability of alternative package types or direct substitutes from Texas Instruments. Ensure that the 16-SOIC footprint matches your existing board design constraints. Check for RoHS compliance details in the latest documentation if required for your manufacturing standards.

Selection Notes

Select this component when dual independent decoding with open-collector outputs is required in a 5V logic environment. The ALS series offers faster propagation delays compared to standard LS logic. Consider the 16-SOIC package dimensions for PCB layout compatibility. Verify that the 8 mA sink current capability meets the load requirements of the connected circuits.

Part Context

This device belongs to the Texas Instruments SN74ALS family of advanced small-scale integration logic components. It is categorized under encoders, decoders, multiplexers, and demultiplexers. The SN74ALS156D is the base part number, with the DE4 suffix indicating specific packaging and environmental specifications. It serves as a digital logic solution for address and data line management.

Replacement Considerations

The product is listed as obsolete. Review Texas Instruments documentation for confirmed substitute part numbers or alternative package types. Evaluate functional compatibility regarding pinout and electrical characteristics when selecting alternatives.