54ACT373FM-MLS

Overview

The 54ACT373FM-MLS is an octal transparent latch with three-state outputs manufactured by National Semiconductor. It belongs to the ACT series of high-speed CMOS logic functions. The device features eight latches in a single package, providing true outputs suitable for bus-driving applications. It operates on a single 5-volt supply and is designed for driving highly capacitive or relatively low-impedance loads. The component is characterized over a full military temperature range of -55 °C to +125 °C.

Feature Summary

• Radiation-hardened CMOS construction ensuring reliability in harsh environments
• Latchup immune design preventing functional failure under radiation stress
• Three-state bus-driving true outputs for efficient data transfer
• Full parallel access capability for simultaneous loading operations

Applications

• Buffer registers in aerospace systems
• I/O ports for military-grade equipment
• Bidirectional bus drivers in satellite communications

Procurement Notes

Verify that the specific suffix 'MLS' corresponds to the exact Military Standard Drawing (SMD) requirements for your application. Confirm QML qualification status directly with Cobham Semiconductor Solutions or authorized distributors, as this part falls under strict defense procurement protocols. Ensure the ceramic hermetic package integrity matches your environmental sealing needs.

Selection Notes

Select this component when radiation hardness and latchup immunity are critical for system reliability. It is appropriate for designs requiring high-speed CMOS performance within a military temperature range. Consider the 20-pin DIP or flatpack package options based on board space and mounting constraints. Verify compatibility with standard 5V logic levels for seamless integration into existing bus architectures.

Part Context

This component is part of the UT54ACTS373 family produced by Cobham Semiconductor Solutions, formerly associated with National Semiconductor's military logic lines. These devices are specifically engineered for the most difficult environmental conditions found in aerospace and defense industries. The family includes various package options to support flexible integration into complex electronic systems requiring robust data storage and transmission capabilities.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult manufacturer guidelines for cross-referencing equivalent radiation-hardened octal latches.