SN74HC257ANSR

Overview

The SN74HC257ANSR is a high-speed CMOS logic device manufactured by Texas Instruments, belonging to the HC series. It functions as a quad 2-to-1 data selector or multiplexer featuring non-inverting three-state outputs. The component is housed in a 16-pin SOIC-Narrow package and supports surface-mount installation. It operates within a supply voltage range of 2 V to 6 V and maintains an operating temperature range from -40°C to +85°C. Key electrical specifications include a maximum propagation delay of 25 ns and four independent circuits.

Feature Summary

• Provides four independent channels for selecting between two input lines per channel
• Features three-state outputs that prevent loading of data lines when disabled
• Utilizes high-speed CMOS technology for efficient digital signal routing

Applications

• Data selection systems requiring multi-channel input management
• Multiplexing applications for routing digital signals
• Bus-oriented system architectures utilizing shared data lines

Procurement Notes

Verify the specific suffix 'ANSR' against official Texas Instruments documentation to confirm the exact package type, tape-and-reel quantity, and RoHS compliance status. Ensure the ordering information matches the required industrial temperature range and pin configuration before finalizing procurement orders.

Selection Notes

Select this component when designing systems requiring quad 2-to-1 multiplexing with three-state output control. It is suitable for applications needing operation across a wide voltage range of 2 V to 6 V. Consider the 25 ns propagation delay and SOIC-16 package dimensions during PCB layout and timing analysis.

Part Context

This part belongs to the SN74HC257 family of quad 2-input multiplexers. It shares functional similarities with other Texas Instruments devices such as the SN74ALS257ANSR and SN74HC257DR, differing primarily in logic family characteristics, speed parameters, and packaging options like SOIC vs. SOIC-Narrow.

Replacement Considerations

The SN74HC257DR serves as a verified alternative offering identical logical functionality but utilizes a different SOIC-Narrow-16 package variant. Cross-reference datasheets to ensure pin compatibility and verify that the replacement meets the specific voltage and temperature requirements of the design.