54H74FM

Overview

The 54H74FM is a military-grade dual D-type flip-flop from the H-TTL series, manufactured by National Semiconductor. It features two independent circuits with complementary outputs and an active-low clear input. The device utilizes a 14-lead ceramic dual-in-line package (DIP) designed for high reliability in harsh environments. It operates within a temperature range of -55 °C to 125 °C and supports a standard supply voltage of 5 V. Propagation delay is typically 15 ns.

Feature Summary

• Dual independent D-type flip-flops with complementary outputs
• Active-low asynchronous clear function
• Military-grade environmental and burn-in processing
• Hermetically sealed ceramic packaging

Applications

• High-reliability aerospace data storage systems
• Military-grade digital signal processing registers
• Harsh environment control logic sequencing

Procurement Notes

Verify that the specific part number suffix corresponds to the required military qualification level and ceramic package variant. Confirm compliance with relevant defense standards such as MIL-STD-38535 or MIL-STD-38534 during acquisition. Ensure sourcing channels provide traceable documentation regarding environmental testing and burn-in procedures to validate authenticity and performance specifications.

Selection Notes

Select this component when designing systems requiring robust TTL logic under extreme thermal conditions. The ceramic construction provides superior protection against moisture and mechanical stress compared to plastic packages. Consider the propagation delay and power consumption characteristics relative to other H-TTL devices to ensure timing compatibility within the target circuit architecture.

Part Context

This device belongs to the 54-series logic family, which denotes military-grade specifications distinct from commercial 74-series counterparts. The FM suffix indicates a specific military ceramic dual-in-line configuration. It serves as a fundamental building block for sequential logic circuits in applications demanding high durability and long-term stability.

Replacement Considerations

Public confirmed substitute part numbers are not available.