74AC251SJ

Signal Switches, Multiplexers, Decoders Overview

The Fairchild Semiconductor 74AC251SJ is a single 8-line to 1-line high-speed CMOS multiplexer housed in a 16-lead Small Outline Package (SOP). It operates within a supply voltage range of 2V to 6V, providing outputs that source and sink 24mA. The device features three-state outputs controlled by an active-low enable input, allowing direct interface with bus-oriented systems. Key electrical parameters include a propagation delay of 17ns at 5V with 50pF load capacitance, and a quiescent current of 4µA. It supports an operating temperature range from -55°C to 125°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• High-speed 8-to-1 data selection capability using common select inputs
• Three-state outputs facilitate direct connection to bus-oriented architectures
• Robust output drive strength supporting 24mA source and sink currents
• Wide supply voltage operation compatible with standard logic families

Signal Switches, Multiplexers, Decoders Applications

• Data routing in bus-oriented communication systems
• Channel selection for analog or digital signal paths
• Implementation of parallel-to-serial data conversion circuits
• Address decoding and memory selection logic

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix SJ corresponds to the 16-lead SOP package configuration required for your design. Confirm RoHS compliance status as historical Fairchild documentation may vary. Ensure the supply chain provides original manufacturer datasheets to validate electrical characteristics against your system requirements before integration.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when an 8-channel multiplexer with high drive capability is needed. The AC series offers faster switching speeds compared to standard 74LS equivalents. Verify that the 2V to 6V supply range aligns with your system power rails. Consider the SOP package dimensions for PCB layout constraints and thermal management needs.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AC family of high-speed CMOS logic devices. It serves as a functional equivalent to other industry-standard 8-to-1 multiplexers like the 74HC251 or 74HCT251, though with distinct voltage and speed characteristics. The AC series is designed for applications requiring lower power consumption than TTL while maintaining higher performance than standard HC logic.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include the 74HC251 and 74HCT251 from various manufacturers. Verify pin compatibility and ensure the replacement meets the required voltage and speed specifications.