54ACT373DM-MLS

Overview

The 54ACT373DM-MLS is a high-speed CMOS octal transparent latch with tri-state outputs, designed for radiation-hardened aerospace applications. It operates within a voltage range of 4.5 V to 5.5 V and supports a temperature range of -55 °C to +125 °C. The device features hermetic ceramic packaging, ensuring immunity from single event latch-up (SEL) up to 110 MeV.cm²/mg and total ionizing dose (TID) hardness of 300 krad(Si). It includes guaranteed output skew, simultaneous switching specifications, and nondestructive hot insertion capability.

Feature Summary

• Hermetic ceramic DIP package suitable for harsh environments
• Radiation hardening against TID and single event effects
• Tri-state outputs for bus-oriented system interfacing
• Guaranteed latchup protection and glitch-free loading

Applications

• Aerospace bus interface systems
• Spacecraft data acquisition circuits
• Harsh environment logic control
• Military communication equipment

Procurement Notes

Verify the specific suffix 'MLS' indicates military screening or lot traceability requirements distinct from commercial variants. Confirm that the supplier provides documentation of QML-V qualification or SMD compliance if required for the application. Ensure the ceramic package integrity matches the specified hermetic sealing standards for the intended operational environment.

Selection Notes

Select this component when radiation tolerance and hermetic sealing are mandatory. The ACT series offers TTL-compatible input thresholds while maintaining CMOS power efficiency. Verify that the 4.5 V to 5.5 V supply range aligns with the system power architecture. Consider the 20-pin DIP form factor for through-hole mounting constraints in the design.

Part Context

This part belongs to the 54AC/54ACT series of radiation-hardened logic functions manufactured by National Semiconductor (now TI). These components are engineered for aerospace reliability, featuring hermetic packages and strict screening. The series includes various gates, latches, and buffers designed to withstand extreme space conditions and ionizing radiation exposure.

Replacement Considerations

Equivalent radiation-hardened octal latches include the 54ACT373J or 54ACT373M from qualified manufacturers. Verify pinout compatibility and electrical parameters such as propagation delay and output drive current. Ensure the replacement maintains the same hermetic ceramic package type and radiation qualification level.