74F521SCX

Overview

The Fairchild Semiconductor 74F521SCX is an expandable 8-bit identity comparator integrated circuit manufactured by Fairchild/ON Semiconductor. It compares two words of up to eight bits each and provides a LOW output when the two words match bit for bit. The device is a surface-mount type with active low output and operates on a supply voltage of 4.5V.

Feature Summary

• Expandable 8-bit comparison capability
• Active low output signal generation upon bit-for-bit match

Applications

• Digital data matching systems
• Address decoding circuits
• Comparator logic modules

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and lead-free packaging specifications. Check for obsolete status indicators as availability may be limited. Ensure proper handling procedures for surface-mount components during assembly.

Selection Notes

Consider the 74ACT521SCX alternative for broader operating temperature ranges extending to -40°C compared to the standard 0°C minimum. Evaluate package compatibility between SOIC variants. Assess supply chain stability given potential obsolescence status of the original part number.

Part Context

This component belongs to the 74-series logic family, specifically designed for digital comparison tasks. It serves as an identity comparator within semiconductor logic circuits, providing reliable bit-matching functionality for embedded systems and digital electronics applications requiring precise data verification.

Replacement Considerations

The 74ACT521SCX offers comparable functionality with extended temperature range capabilities (-40°C to 85°C). Both parts utilize 20-SOIC packages with similar pin configurations. Verify electrical characteristics compatibility before substitution in existing designs.