54ACT251/QEA

Overview

The 54ACT251/QEA is a high-speed CMOS octal multiplexer manufactured by Rochester Electronics. It features eight data inputs, three address select lines, and an enable input to control the tri-state output. The device operates with complementary outputs and supports standard TTL logic levels. It is housed in a ceramic package designed for military or extended temperature applications, ensuring reliable performance in demanding environments.

Feature Summary

• Provides selectable routing of one of eight data inputs to a single output line based on address signals.
• Features tri-state output capability to facilitate bus-oriented systems and signal isolation.
• Includes an enable input that controls data flow, allowing for system synchronization and power management.

Applications

• Data routing in communication systems
• Signal selection in test and measurement equipment
• Address decoding in industrial control units

Procurement Notes

Verify the specific suffix QEA against official manufacturer documentation to confirm package type and temperature range. Ensure compatibility with existing board layouts and voltage requirements before integration. Confirm lead times and availability directly with authorized distributors as supply chains may vary.

Selection Notes

Select this component when a robust, high-speed multiplexer with tri-state outputs is required for critical applications. Consider the ceramic packaging for enhanced durability in harsh environments. Verify that the input logic levels match the system's voltage standards to ensure proper operation.

Part Context

Rochester Electronics specializes in providing lifecycle solutions for obsolete and hard-to-find semiconductors. This part belongs to the ACT series, known for high speed and low power consumption. The company ensures quality through rigorous testing and manufacturing processes, supporting long-term product availability.

Replacement Considerations

Check for direct pin-compatible alternatives from Texas Instruments or National Semiconductor within the 54ACT251 family. Verify electrical specifications and package dimensions to ensure seamless integration without circuit redesign.