54LS54/SDA

Overview

The SN54LS54/SDA is a military-grade AND-OR-Invert gate manufactured by Rochester Electronics. It implements the Boolean function Y=ABCD+EFGH using Low-power Schottky TTL technology. The device features an 8-input configuration within a single functional unit, housed in a ceramic DIP-14 package. It is qualified for operation across the full military temperature range of -55°C to 125°C and meets MIL-PRF-38535 Class Q standards.

Feature Summary

• Implements complex logic functions via dual 4-input AND terms combined into a single OR-INVERT output structure
• Utilizes Low-power Schottky (LS) technology to balance switching speed with reduced power consumption
• Constructed in hermetically sealed ceramic packaging designed for high-reliability aerospace and defense environments

Applications

• Military avionics control systems requiring radiation-hardened or high-reliability logic components
• Spacecraft telemetry and command processing circuits
• Defense communication equipment operating under extreme thermal conditions

Procurement Notes

Verify that the component carries the specific SDA suffix designation, indicating compliance with MIL-PRF-38535 Class Q requirements. Confirm the presence of dual markings on the package surface as specified for this variant. Ensure documentation includes traceability to original manufacturer data sheets and test programs to validate performance against military specifications.

Selection Notes

Select this component when system design demands robust logic inversion capabilities within a single package for critical applications. The LS series offers a favorable trade-off between propagation delay and power dissipation compared to standard TTL. The ceramic construction provides superior environmental sealing compared to plastic alternatives, making it suitable for harsh operational contexts where long-term stability is mandatory.

Part Context

Rochester Electronics supplies this part as a manufactured component sourced from original suppliers or recreated wafers. The product line adheres to strict quality oversight including ISO-9001 and AS9120 certifications. This specific item serves as a replacement for legacy military logic gates, ensuring continuity for existing defense hardware platforms without redesigning the underlying circuit architecture.

Replacement Considerations

Direct replacements include other SN54LS54 variants with compatible pinouts and logic functions. Verify that substitute parts maintain the same ceramic DIP-14 form factor and meet the required -55°C to 125°C temperature rating.