74ACT257SJX

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74ACT257SJX is a quad 2-input multiplexer featuring true outputs and three-state control. It operates on a single supply voltage ranging from 4.5V to 5.5V. The device provides high drive capability with output currents of 24mA for both high and low states. It is housed in a 16-SOIC surface-mount package and supports an operating temperature range from -40°C to 85°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Quad 2-to-1 multiplexing architecture with common data select input
• Three-state outputs allowing direct interface with bus-oriented systems
• TTL-compatible inputs ensuring compatibility with standard logic families

Signal Switches, Multiplexers, Decoders Applications

• Bus-oriented system data routing
• Multiplexer expansion by tying outputs together
• Data selection between two sources

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific manufacturer origin, as this part number may be sourced from various distributors or legacy stock. Confirm RoHS compliance status and check for obsolescence notices, as older ACT series components are frequently discontinued. Ensure the SOIC-16 package dimensions match your PCB footprint requirements before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a quad multiplexer with three-state outputs is required for 5V logic applications. It is suitable for designs needing TTL-compatible inputs and moderate drive strength. Consider alternative active parts if long-term supply stability is critical, as this specific Fairchild variant may be obsolete.

Signal Switches, Multiplexers, Decoders Part Context

This component belongs to the 74ACT logic family, which combines CMOS low power consumption with Schottky TTL speed. The base product number is 74ACT257. The 'SJX' suffix typically denotes a specific tape-and-reel packaging configuration for surface-mount assembly.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Public confirmed substitute part numbers include MC74ACT257DG from onsemi.