74AC521SC-G

Overview

The 74AC521SC-G is an 8-bit identity comparator manufactured by Rochester Electronics, LLC. It belongs to the 74AC series of CMOS logic devices. The component provides inverted outputs for magnitude comparison results. It operates within a supply voltage range of 2 V to 6 V and supports a counting rate of up to 140 MHz. The device functions reliably across an industrial temperature range of -40°C to 85°C. It is housed in a standard surface-mount package designed for integration into digital logic circuits requiring precise bit-wise equality verification.

Feature Summary

• Performs 8-bit identity comparison with inverted output signals
• Utilizes AC series CMOS technology for high-speed operation
• Supports wide supply voltage ranges from 2 V to 6 V

Applications

• Digital data bus equality checking
• Address matching circuits
• Control logic validation systems

Procurement Notes

Verify the manufacturer designation as Rochester Electronics, LLC, which typically supplies surplus or discontinued inventory rather than original production runs. Confirm the specific suffix 'G' indicates lead-free compliance if required by assembly standards. Check datasheet revisions to ensure pinout and electrical characteristics match the target design requirements, as legacy components may have multiple manufacturing variants.

Selection Notes

Select this component when an 8-bit identity comparator is required within the 74AC logic family specifications. Ensure the design accommodates the inverted output polarity inherent to this part number. Verify that the operating voltage and temperature ranges align with the system environment. Consider the availability status, as Rochester Electronics often handles end-of-life or legacy stock, which may impact long-term supply continuity compared to active manufacturer lines.

Part Context

This component is part of the broader 74AC logic family, known for high-speed CMOS performance. Rochester Electronics, LLC acts as a distributor of excess inventory and discontinued parts from various original equipment manufacturers, including ON Semiconductor. The '74AC521' base part number identifies the functional logic type, while the '-G' suffix and manufacturer attribution specify the specific supply chain source and compliance attributes of this particular batch.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.