SN74ALS857NT

Overview

The SN74ALS857NT is a hex 2-to-1 universal multiplexer featuring three-state outputs, manufactured by Texas Instruments. It belongs to the ALS logic series and operates within a supply voltage range of 4.5 V to 5.5 V. The device provides six independent multiplexing functions in a single package. Key electrical characteristics include a low-level output current of 24 mA and a high-level output current of 2.6 mA. It is housed in a 24-pin PDIP package and supports surface mount or through-hole installation depending on the specific variant suffix.

Feature Summary

• Provides six independent 2-to-1 multiplexing channels for signal routing
• Features three-state outputs to facilitate bus-oriented systems
• Supports universal input configurations for flexible logic implementation

Applications

• Bus-oriented system data routing
• Digital signal switching applications
• Multiplexed data transmission lines

Procurement Notes

Verify the exact ordering suffix to confirm package type and tape/reel specifications. Ensure the component matches the required ALS series performance standards. Confirm RoHS compliance status if environmental regulations apply to your assembly process. Cross-reference the manufacturer part number with authorized distributor catalogs to ensure authenticity and traceability.

Selection Notes

Select this component when multiple independent 2-to-1 signal paths are required in a compact form factor. The ALS series offers a balance of speed and power consumption suitable for standard TTL environments. Consider the three-state output capability if the design requires shared bus architectures. Verify that the operating temperature range meets the specific application requirements.

Part Context

This component is part of the Texas Instruments SN74ALS family of logic integrated circuits. The ALS series is designed to provide faster switching speeds compared to standard LS logic while maintaining lower power dissipation. Multiplexers in this family are essential for managing data flow in digital systems where multiple sources need to share a common destination line efficiently.

Replacement Considerations

Compatible substitutes include other hex 2-to-1 multiplexers from the same logic family. Check for equivalent pinouts and electrical specifications before substitution. Ensure the replacement part supports three-state outputs if bus isolation is required. Verify compatibility with existing PCB footprints and soldering processes.