JM54AC74SCA-RH

Overview

The JM54AC74SCA-RH is a dual positive-edge-triggered D flip-flop manufactured by National Semiconductor using AC-CMOS technology. It features independent data inputs (D) and clock inputs (CLK), along with asynchronous preset (PRE) and clear (CLR) controls for direct state manipulation. The device operates within a supply voltage range of 3.0 V to 5.0 V, supporting standard logic levels. Designed for military specifications, it ensures reliable performance across extreme temperature ranges from -55 °C to 125 °C. The component utilizes a ceramic flatpack package to provide robust environmental protection and thermal stability suitable for demanding aerospace and defense applications.

Feature Summary

• Dual positive-edge-triggered D flip-flops with independent control signals
• Asynchronous preset and clear functions for immediate state initialization
• Military-grade reliability with extended operating temperature range
• High noise immunity and stable output characteristics via AC-CMOS technology

Applications

• Aerospace digital signal processing systems
• Defense communication equipment data storage
• Military-grade sequential logic circuits
• Harsh environment control system registers

Procurement Notes

Verify the authenticity of the National Semiconductor manufacturer marking on the component surface. Confirm the specific suffix 'RH' corresponds to the required military qualification and tape-and-reel packaging format if applicable. Ensure the ceramic flatpack integrity is intact prior to installation. Cross-reference the date code against current availability lists as legacy military components may have limited production runs. Request full traceability documentation for critical defense or aerospace deployments.

Selection Notes

Select this component when dual D flip-flops are required in high-reliability environments with strict temperature constraints. It serves as a direct replacement for other 54AC74 variants meeting MIL-STD requirements. Consider the ceramic package size and pin configuration during PCB layout. Verify compatibility with existing 5V logic interfaces if operating at the upper voltage limit. Evaluate power consumption profiles against system thermal budgets for enclosed military enclosures.

Part Context

This part belongs to the 54AC series of high-speed CMOS logic devices originally developed by National Semiconductor. The 54-series designation indicates compliance with military standards, distinguishing it from the commercial 74AC series. The AC family offers speed comparable to earlier TTL technologies while maintaining low power consumption typical of CMOS. This specific model provides essential sequential logic functionality for complex digital systems requiring certified durability.

Replacement Considerations

The MC74AC74D_33 IBIS model is available for simulation purposes but represents a commercial variant. Direct replacements must maintain the 54-series military qualification and ceramic flatpack form factor. Verify pinout compatibility with existing footprints before substituting with equivalent parts from other manufacturers holding similar military certifications.