54ACT374FM-MLS

Overview

The 54ACT374FM-MLS is a radiation-hardened octal D-type flip-flop with tri-state outputs, manufactured by National Semiconductor (now part of Texas Instruments). It belongs to the 54ACT series, designed for high-speed CMOS applications in aerospace and harsh environments. The device features hermetic packaging to withstand extreme conditions, including total ionizing dose radiation hardness up to 300 krad(Si) and immunity to single event latch-up. Operating voltage ranges from 4.5 V to 5.5 V, suitable for TTL-compatible logic levels.

Feature Summary

• Radiation hardened design for aerospace and space applications
• Hermetic ceramic package for environmental protection
• Octal D-type flip-flop with tri-state outputs
• Immune to single event latch-up and upset

Applications

• Aerospace systems requiring radiation tolerance
• Spacecraft data bus interfaces
• Harsh environment digital logic circuits
• Military microcircuit applications

Procurement Notes

Verify that the supplier provides documentation confirming the specific 'MLS' suffix denotes the correct hermetic military package variant. Ensure the component is sourced from authorized distributors or qualified vendors who can provide traceability to the original National Semiconductor/TI manufacturing standards. Request test reports verifying radiation hardness qualifications if required for mission-critical deployments.

Selection Notes

Select this component when high-speed octal latching is required in radiation-exposed environments. The ACT series offers faster switching than standard AC/HC families while maintaining CMOS power efficiency. Confirm compatibility with existing 5V TTL logic levels and verify that the hermetic package form factor fits the mechanical constraints of the target assembly.

Part Context

This part is part of the broader 54ACT family of high-speed CMOS logic functions. It shares functional similarities with other octal flip-flops like the 54FCT374 but differs significantly in radiation hardness and packaging. The 54ACT series is specifically engineered to meet stringent aerospace requirements, distinguishing it from commercial-grade counterparts.

Replacement Considerations

Direct replacements must match the radiation hardness and hermetic package specifications. Consider equivalents such as the M54HC374 from STMicroelectronics, which also offers ESCC qualification and similar radiation tolerance. Verify pinout and electrical characteristics before substitution.