74F524SC

Overview

The onsemi 74F524SC is an octal magnitude comparator belonging to the 74F logic series. It features eight independent comparison channels housed in a 20-SOIC package. The device operates within a supply voltage range of 4.5V to 5.5V and supports three distinct output functions indicating A less than B, A equal to B, and A greater than B. Outputs are active high. The component is designed for surface mount installation with a specified operating temperature range of 0°C to 70°C.

Feature Summary

• Provides simultaneous magnitude comparison across eight independent bit pairs
• Delivers three dedicated active-high status outputs for relational conditions
• Compatible with standard 5V logic systems via defined supply voltage limits

Applications

• Digital data path routing based on value thresholds
• Address decoding and memory selection logic
• Comparator circuits in measurement instrumentation

Procurement Notes

This component is officially designated as obsolete and no longer manufactured by onsemi. Procurement must rely exclusively on verified direct substitutes from other manufacturers. Verify pin compatibility and electrical specifications against original datasheets before integration. Avoid sourcing from unauthorized distributors due to potential authenticity risks associated with end-of-life parts.

Selection Notes

Engineers should prioritize replacement components that match the 20-SOIC footprint and 74F series performance characteristics. Ensure the substitute maintains identical output polarity and propagation delay requirements. Cross-reference functional truth tables to guarantee logical equivalence. Consider thermal management and voltage tolerance margins when integrating alternative sources into existing designs.

Part Context

The 74F524SC belongs to the legacy 74F (Fast) logic family, known for high-speed operation compared to earlier standards. As an octal comparator, it consolidates multiple comparison functions into a single integrated circuit, reducing board space. Its obsolescence reflects industry shifts toward newer logic families with improved power efficiency and broader voltage compatibility options.

Replacement Considerations

Direct substitute part numbers include SN74F524DW and SN74F524DWR from Texas Instruments. These alternatives offer equivalent functionality and pinout compatibility. Verify mechanical dimensions and electrical parameters against the original specification sheet prior to implementation.