54AC257/QEA

Overview

The 54AC257/QEA is a quad multiplexer manufactured by Rochester Electronics, LLC. It belongs to the AC series of CMOS logic devices and features four independent 2-line to 1-line data selectors with true outputs. The component utilizes a CQCC20 ceramic leaded chip carrier package, designated as LCC-20. It supports an extended industrial temperature range from -55 °C to +125 °C. The device incorporates three-state output capability for bus-oriented applications. Key electrical parameters include a maximum low-level output current of 0.012 A and a load capacitance specification of 50 pF.

Feature Summary

• Provides four independent multiplexing channels within a single integrated circuit
• Features three-state outputs to facilitate efficient bus system interconnections
• Utilizes a hermetically sealed ceramic package for enhanced environmental protection
• Supports operation across a wide industrial temperature range

Applications

• Bus-oriented memory systems requiring high-speed data routing
• Industrial control environments demanding extended temperature stability
• Military and aerospace electronic assemblies requiring ceramic packaging reliability

Procurement Notes

Verify the specific manufacturer marking on the component surface to confirm it originates from Rochester Electronics rather than the original design house. Ensure the ceramic package integrity is intact upon receipt. Confirm that the part meets the required military or industrial specifications if the application demands strict environmental compliance standards.

Selection Notes

Select this component when a quad multiplexer with three-state outputs is required in a harsh environment. The ceramic package offers superior durability compared to plastic alternatives. Verify that the voltage levels and signal speeds are compatible with the target system architecture before integration.

Part Context

This part is a commercial-to-military grade version of the standard 54AC257 quad multiplexer. Rochester Electronics provides lifecycle support for legacy components no longer actively produced by original manufacturers. The Q suffix typically denotes qualification for extended temperature ranges and stricter manufacturing controls.

Replacement Considerations

Direct pin-compatible replacements include the 54AC257M and 54AC257LM. Verify that substitute parts maintain the same ceramic package style and three-state output functionality to ensure seamless integration without board redesign.