54AC138/QFA

Overview

The 54AC138/QFA is a single 3-to-8 decoder/demultiplexer manufactured by Rochester Electronics. It belongs to the 54AC logic family, offering high-speed performance with low power consumption typical of AC series CMOS devices. The component features inverted outputs and is designed for military or extended temperature range applications, indicated by the 54 prefix. It is dual marked as part number 5962-8762201FA, signifying its classification within the DoD microelectronics procurement program.

Feature Summary

• Provides decoding functionality for three binary inputs to eight active-low outputs
• Utilizes AC-series CMOS technology for enhanced speed and power efficiency
• Designed for operation in demanding environments consistent with 54-series specifications

Applications

• Military aerospace electronic systems requiring certified logic components
• Industrial control units utilizing extended temperature range logic gates
• Defense communication equipment integrating demultiplexing functions

Procurement Notes

Verify the manufacturer designation explicitly states Rochester Electronics, LLC, rather than Texas Instruments, despite the shared functional lineage. Confirm the dual marking reference 5962-8762201FA matches your bill of materials requirements. Ensure the package type aligns with your board layout constraints, as variations exist within the 54AC138 family. Request full traceability documentation if the application mandates strict supply chain auditing for critical infrastructure.

Selection Notes

Select this component when system design requires AC-speed logic levels rather than standard HC or HCT families. The 54-series rating indicates suitability for wider voltage and temperature ranges compared to commercial 74-series equivalents. Consider the inverted output polarity during schematic capture to ensure correct logic interfacing. Verify that the ceramic or plastic package options meet the mechanical stress requirements of the final assembly environment.

Part Context

Rochester Electronics specializes in sourcing and distributing discontinued and hard-to-find semiconductors. This part represents a continuation of legacy Texas Instruments designs, often produced under government contract specifications. The 54AC138 variant serves as a high-performance alternative to older 54LS or 54HC counterparts in existing military hardware maintenance and modernization projects.

Replacement Considerations

Direct substitutes include SN54AC138 variants from Texas Instruments or other authorized distributors holding the same 5962-8762201FA specification. Cross-reference pinouts carefully, as package styles such as LCC or CDIP may differ while maintaining electrical compatibility.