74AC521SC REEL

Overview

The 74AC521SC REEL is an 8-bit identity comparator from the AC series, manufactured by Rochester Electronics. It features inverted outputs and utilizes CMOS technology. The device operates within a supply voltage range of 2V to 6V. It is packaged in a 20-SOIC format with surface mount mounting type. The component supports an operating temperature range of -40°C to 85°C. It exhibits a maximum quiescent current of 4 µA and provides output drive capabilities of 24mA for both high and low states.

Feature Summary

• Performs 8-bit magnitude comparison with active low identity output
• Utilizes CMOS technology for low power consumption
• Supports wide supply voltage operation from 2V to 6V

Applications

• High-speed digital system data validation
• Address matching circuits
• Data bus integrity verification

Procurement Notes

Verify the specific suffix 'REEL' indicates reel packaging rather than tube. Confirm the manufacturer designation as Rochester Electronics, LLC, which often sources components from original manufacturers like Texas Instruments or Harris. Ensure the package matches the 20-SOIC specification. Check for RoHS compliance status if required for your assembly process. Validate the part number against official distributor catalogs to avoid counterfeit inventory.

Selection Notes

Select this component when an 8-bit identity comparator with inverted logic is required. The AC series offers faster switching speeds compared to standard 74LS equivalents. Ensure the system voltage falls within the 2V to 6V range. Consider the 20-SOIC package dimensions for PCB layout compatibility. Verify that the 4 µA quiescent current meets the power budget constraints of the application.

Part Context

This component belongs to the 74AC logic family, known for high-speed performance and CMOS compatibility. The 74AC521 specifically functions as an identity comparator, determining if two 8-bit inputs are equal. Rochester Electronics typically supplies these parts as surplus or obsolescence management solutions for legacy designs requiring this specific logic function.

Replacement Considerations

Direct substitutes include the 74ACT521SC from onsemi, which shares similar functionality but operates at fixed 5V logic levels. Other compatible variants may exist from original equipment manufacturers such as Texas Instruments or Harris Corporation, depending on the specific pinout and electrical characteristics required.