SN74ALS521DWRE4

Comparators Overview

The SN74ALS521DWRE4 is an 8-bit identity comparator manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and features open-collector outputs. The device is housed in a 20-SOIC package with a maximum operating temperature of +70°C. Propagation delays are specified at 12 ns, 20 ns, and 22 ns under varying conditions. Maximum supply current is 19 mA. Output drive capabilities include 2.6 mA high and 24 mA low currents.

Comparators Feature Summary

• Performs 8-bit identity comparison functions
• Utilizes open-collector output configuration
• Compatible with standard 5V logic systems

Comparators Applications

• Digital data comparison circuits
• Address decoding systems
• Data validation logic

Comparators Procurement Notes

Verify the specific suffix 'E4' indicates lead-free compliance or environmental designation as per Texas Instruments documentation. Confirm the SOIC-20 package dimensions match your PCB footprint requirements. Ensure the open-collector output type aligns with your pull-up resistor design. Check for active lifecycle status to ensure long-term availability.

Comparators Selection Notes

Select this component when 8-bit parallel comparison is required with open-collector outputs. Consider the propagation delay specifications against your system timing constraints. Verify that the 4.5V to 5.5V supply range fits your power architecture. Evaluate the thermal performance within the 0°C to +70°C operating range for your specific environment.

Comparators Part Context

This part belongs to the SN74ALS series of advanced low-power Schottky logic devices. It serves as a digital comparator within the broader family of Texas Instruments logic ICs. The DWRE4 designation specifies the tape-and-reel packaging variant of the SOIC-20 package.

Comparators Replacement Considerations

SN74ALS521DWR is a compatible alternative from the same manufacturer with identical electrical characteristics but potentially different packaging or environmental markings.