JM54AC257B2A

Overview

The JM54AC257B2A is a military-grade, dual 2-input multiplexer manufactured by National Semiconductor. It belongs to the 54AC family of CMOS logic devices, designed for high-reliability applications requiring radiation hardness and wide temperature operation. The component features plastic packaging and is qualified under MIL-PRF-38535 standards. Official documentation highlights specific investigations into its ionizing dose response, noting that plastic-packaged samples subjected to burn-in exhibit enhanced degradation characteristics under irradiation. This behavior necessitates rigorous characterization for system developers utilizing this part in harsh environments.

Feature Summary

• Military-grade qualification compliant with MIL-PRF-38535 standards
• Dual 2-input digital multiplexer functionality within the 54AC CMOS family
• Plastic package construction with documented sensitivity to ionizing radiation effects
• Burn-in process influence on post-irradiation parameter stability

Applications

• Radiation-hardened digital signal routing systems
• Military aerospace control units requiring MIL-PRF-38535 compliance
• High-reliability data selection circuits in harsh thermal environments

Procurement Notes

Verify the specific lot history regarding burn-in procedures, as official studies indicate significant variations in post-irradiation performance based on whether the plastic-packaged components underwent burn-in. Ensure radiation hardness characterization matches the exact package and burn-in configuration intended for the final system deployment to account for observed degradation patterns.

Selection Notes

Select this component only when military qualification under MIL-PRF-38535 is mandatory. Engineers must account for the specific degradation behaviors associated with plastic packaging and burn-in states under ionizing radiation. Standard commercial AC series parts do not offer this level of environmental qualification or documented radiation response data.

Part Context

This device is part of the broader 54AC logic family produced by National Semiconductor, now part of Texas Instruments. The 54-series designation indicates military-grade specifications, distinguishing it from the commercial 74AC series. The specific model JM54AC257B2A represents a dual multiplexer variant within this high-reliability portfolio.

Replacement Considerations

Direct parametric equivalents are limited due to the specific military qualification and radiation hardening requirements. Substitutes must match the 54AC family logic levels and MIL-PRF-38535 grade. Verify radiation tolerance data for any alternative, as plastic package burn-in effects vary significantly between manufacturers.