JM54AC139SFA-RH

Overview

The JM54AC139SFA-RH is a dual 1-of-4 decoder/demultiplexer manufactured by National Semiconductor. It operates within the 54AC logic family, designed for military-grade performance with a temperature range of -55°C to 125°C. The device features two independent decoders, each providing four active-low outputs selected by two address inputs and an enable input. Packaged in a 16-pin Ceramic Flat Package (CFP), it ensures high reliability for harsh environments.

Feature Summary

• Dual independent 1-of-4 decoding capability
• Military-grade temperature rating (-55°C to 125°C)
• Ceramic Flat Package construction for durability

Applications

• Military avionics systems
• Spacecraft data routing
• Harsh environment industrial control

Procurement Notes

Verify the specific suffix 'RH' against the manufacturer's current datasheet to confirm RoHS compliance status and exact pinout configuration. Ensure the ceramic flat package variant matches the required footprint for your PCB design. Cross-reference the MIL-STD-883 screening level if environmental qualification is mandatory for your application.

Selection Notes

Select this component when dual decoding is required in extreme thermal conditions. The AC technology offers faster switching speeds compared to standard 54-series TTL while maintaining low power consumption. The ceramic package provides superior hermeticity and mechanical strength compared to plastic alternatives, making it suitable for vibration-prone or vacuum applications.

Part Context

This part belongs to the 54AC series of logic devices, which are radiation-hardened and qualified for military specifications. It serves as a robust alternative to commercial-grade logic in defense and aerospace sectors. The 54AC family bridges the performance gap between older TTL and newer CMOS technologies, offering compatibility with existing system architectures while improving speed.

Replacement Considerations

Direct substitutes include other 54AC139 variants from National Semiconductor or Texas Instruments. Verify that any replacement maintains the same 16-pin CFP package and military temperature range. Ensure the substitute supports the same voltage levels and output drive capabilities.