74AC257SC

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74AC257SC is a quad 2-input multiplexer featuring non-inverting three-state outputs. It operates within a supply voltage range of 2V to 6V and supports data rates with propagation delays of 8.5ns at 3.3V and 6ns at 5V. The device is housed in a 16-lead Small Outline Integrated Circuit (SOIC) package, suitable for surface mount applications across an industrial temperature range of -40°C to +85°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides four independent 2-to-1 data selectors with common select inputs
• Features non-inverting three-state outputs for direct bus interfacing
• Allows output switching to high impedance via a common enable input

Signal Switches, Multiplexers, Decoders Applications

• Bus-oriented system data routing
• Data selector circuits requiring tri-state isolation
• Multiplexer expansion by tying outputs together

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific manufacturer origin as Fairchild Semiconductor assets were acquired by onsemi. Confirm RoHS compliance status and check current availability, as legacy logic components may be subject to discontinuation or limited stock constraints. Ensure the SOIC-16 package matches the target PCB footprint requirements.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing systems requiring multiple independent data paths with shared control lines. The AC series offers faster switching speeds compared to LS variants while maintaining CMOS power efficiency. Verify that the 2V to 6V operating range aligns with the system's power supply rails and that the 24mA output drive capability meets load requirements.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AC logic family, known for high-speed CMOS performance. It serves as a functional equivalent to other quad multiplexers like the 74LS257 but with improved speed characteristics. The device is widely used in digital logic designs where signal selection and bus management are critical.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include MC74AC257DR2G from onsemi and SN74AHCT257 from Texas Instruments. Verify pin compatibility and electrical specifications before substitution.