SN74AS21NSR

Overview

The SN74AS21NSR is a dual 4-input positive-AND gate from the Texas Instruments SN74AS series. It operates within a supply voltage range of 4.5 V to 5.5 V and features a propagation delay of 4.5 ns. The device provides a low-level output current of 8 mA and a high-level output current of -8 mA, with a maximum operating temperature of +70°C. Packaged in a 14-SOIC format, it supports surface-mount installation.

Feature Summary

• Dual 4-input positive-AND logic function
• High-speed operation with 4.5 ns propagation delay
• Standard TTL-compatible input/output characteristics

Applications

• Digital logic circuit design
• Signal processing systems
• Industrial control equipment

Procurement Notes

Verify the specific suffix against official documentation to confirm package type and tape-and-reel specifications. Ensure compatibility with existing board layouts for SOIC-14 footprints. Confirm RoHS compliance status through manufacturer datasheets prior to integration into regulated assemblies.

Selection Notes

Select this component for applications requiring fast switching speeds and standard AND logic functionality. Consider the AS series performance benefits over LS or ALS variants when higher speed is critical. Verify that the 14-pin SOIC package fits the available PCB space and thermal requirements.

Part Context

This part belongs to the SN74AS family, known for advanced Schottky technology offering improved speed-power product compared to earlier generations. It serves as a fundamental building block for complex digital systems requiring reliable logical conjunction operations at high frequencies.

Replacement Considerations

Check for direct pin-compatible alternatives within the same logic family or other manufacturers' equivalents. Ensure electrical parameters such as propagation delay and output drive strength meet or exceed original requirements during substitution.