JM54AC74SYA-RH

Overview

The JM54AC74SYA-RH is a dual D-type flip-flop with preset and clear functions, manufactured by National Semiconductor. It belongs to the 54AC series of high-speed CMOS logic devices designed for aerospace applications. The component features radiation hardness up to 300 krad (Si) total ionizing dose and immunity from single event latch-up up to 110 MeV.cm²/mg. It operates within a voltage range of 2 V to 6 V and supports temperatures from -55 °C to +125 °C. The device is housed in a hermetic ceramic package.

Feature Summary

• Radiation-hardened design suitable for harsh space environments
• Immunity to single event latch-up and upset events
• Hermetic packaging for environmental protection

Applications

• Aerospace digital systems
• Spacecraft data processing circuits
• Military electronic equipment

Procurement Notes

Verify that the specific part number includes the 'RH' suffix indicating radiation hardening qualification. Confirm compliance with SMD specifications and MIL-STD-883 Class B requirements if applicable. Ensure the supplier provides traceability documentation for hermetic seal integrity and radiation testing results prior to procurement.

Selection Notes

Select this component when standard commercial logic devices fail to meet radiation tolerance requirements. It is appropriate for designs requiring reliable operation under high total ionizing dose conditions. Consider the wider operating voltage range compared to standard TTL-compatible AC series parts.

Part Context

This part is part of the 54ACxxxx family produced by STMicroelectronics following their acquisition of National Semiconductor's logic business. The 54AC series offers higher speed than older HC or HCT families while maintaining low power consumption. The hermetic variant is specifically targeted at defense and space sectors.

Replacement Considerations

Public confirmed substitute part numbers: 54AC74.