SN74LS155AD

Overview

The SN74LS155AD is a decoder/demultiplexer integrated circuit manufactured by Texas Instruments. It belongs to the 74LS logic series and features a single 1 x 2:4 circuit configuration housed in a 16-SOIC package. The device operates on a single voltage source ranging from 4.75V to 5.25V. Electrical characteristics include a high-level output current of 400µA and a low-level output current of 8mA. The component supports surface mount technology and functions within an operating temperature range of 0°C to 70°C.

Feature Summary

• Functions as a decoder or demultiplexer with a 1-to-4 channel configuration
• Utilizes Low-power Schottky (LS) logic technology for efficient operation
• Designed for surface mount installation using a 16-pin SOIC housing

Applications

• Address decoding in digital systems
• Data routing via demultiplexing
• Memory chip select generation

Procurement Notes

Verify component authenticity through official manufacturer channels, as the SN74LS155AD is listed as obsolete. Confirm that the specific package variant matches design requirements, noting that demonstration images may not reflect actual delivered units. Request current datasheets directly from Texas Instruments to ensure accurate technical specifications are available for integration planning.

Selection Notes

Select this component only if legacy 74LS compatibility is required for existing designs. Evaluate whether modern alternatives offer improved performance or availability. Ensure the 16-SOIC footprint aligns with the printed circuit board layout. Verify that the single voltage supply requirement fits the system power architecture before finalizing the selection.

Part Context

This part is a member of the Texas Instruments 74LS family, which utilizes Low-power Schottky bipolar technology. The SN74LS155AD specifically implements a 1-of-4 decoder/demultiplexer function. It is distinct from other logic families such as HC or LV due to its specific voltage and speed characteristics defined by the LS standard.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the available documentation.