ACS781LLRTR-100U-T

Current Sensors Overview

The ACS781LLRTR-100U-T is a programmable, thermally enhanced current sensor manufactured by Allegro MicroSystems. It utilizes linear Hall-effect technology for precise DC current measurement with a sensitivity of 26.4mV/A and an accuracy of ±1.5%. The device supports a supply voltage range of 3V to 3.6V and operates within a temperature range of -40°C to +150°C. It features a unidirectional output configuration and a response time of 3.6µs. The component is housed in a compact 7-PowerSMD (PSOF-7) surface-mount package designed for board mounting.

Current Sensors Feature Summary

• Core-less design eliminates magnetic core saturation issues
• Thermally enhanced package improves heat dissipation
• Programmable sensitivity allows customization
• AEC-Q100 qualified for automotive reliability

Current Sensors Applications

• Automotive battery management systems
• Motor control applications
• Power supply monitoring
• Industrial motor drives

Current Sensors Procurement Notes

Verify the specific suffix 'U-T' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm that the 3V-3.6V supply voltage range aligns with the target system's power architecture. Ensure the 7-PowerSMD footprint matches the PCB layout guidelines provided in the official datasheet to maintain thermal performance and electrical integrity during procurement.

Current Sensors Selection Notes

Select this component when high precision and automotive-grade reliability are required for unidirectional current sensing. The low supply voltage requirement makes it suitable for systems powered by single-cell batteries or regulated 3.3V rails. Consider the thermal characteristics of the PSOF-7 package if operating near maximum temperature limits. Verify that the 100A continuous current rating meets the peak load requirements of the application without exceeding safe operating areas.

Current Sensors Part Context

This part belongs to the ACS781 series of highly accurate, programmable current sensors. It is designed for applications requiring galvanic isolation and high bandwidth. The series is known for its core-less architecture which prevents saturation and ensures consistent performance across the entire current range. It is distinct from other Allegro sensors by its specific programmability and automotive qualification.

Current Sensors Replacement Considerations

Check for direct substitutes within the ACS781 family with different current ratings or sensitivities. Verify compatibility with existing PCB footprints and supply voltage constraints before substituting. Consult Allegro MicroSystems for updated replacement recommendations as components may reach end-of-life status.