54LS681J/B

Overview

The 54LS681J/B is an 8-bit arithmetic logic unit (ALU) manufactured by Rochester Electronics, LLC. It operates within a military temperature range of -55°C to 125°C and utilizes a ceramic dual in-line package with 40 terminals. The device supports standard TTL LS series logic levels with a maximum supply voltage of 5.5 V. It functions as a high-speed data processing component designed for robust performance in demanding environments.

Feature Summary

• Supports comprehensive arithmetic and logical operations including addition, subtraction, and bitwise comparisons
• Features independent function select inputs for flexible configuration of computational modes
• Constructed with hermetically sealed ceramic packaging to ensure reliability in harsh conditions

Applications

• Military avionics systems requiring certified logic components
• Industrial control units operating in extreme temperatures
• Radar signal processing architectures

Procurement Notes

Verify the specific suffix J/B against your bill of materials to confirm pinout and package compatibility. Confirm that the ceramic DIP-40 form factor matches your existing board layout. Ensure the supplier provides traceability documentation consistent with MIL-PRF-38535 Class Q requirements for critical applications.

Selection Notes

Select this component when a dedicated 8-bit ALU is required for complex data manipulation tasks. It is suitable for designs needing wide input handling and multiple operation types within a single integrated circuit. Consider its military-grade temperature rating if the application environment exceeds commercial limits.

Part Context

Rochester Electronics specializes in authorized continuing source solutions for obsolete semiconductors. This part belongs to the legacy SN54LS681 family, originally designed for high-reliability computing. The manufacturer ensures these components meet original specifications through rigorous testing protocols.

Replacement Considerations

Direct substitutes include other SN54LS681 variants from different manufacturers. Verify functional equivalence regarding pin assignments and electrical characteristics before integration.