ACS72981LLRATR-100U3

Current Sensors Overview

The Allegro ACS72981LLRATR-100U3 is a high-precision linear Hall-effect-based current sensor IC designed for economical and precise AC or DC current sensing applications. It features a low-resistance copper conductor with a resistance of 200 µΩ, enabling efficient power handling. The device provides an analog voltage output proportional to the sensed current, supporting bidirectional measurement up to ±100 A. Operating within a supply voltage range of 4.5 V to 5.5 V, it delivers a sensitivity of 20 mV/A. The component is housed in a compact 7-PowerSMD (PSOF-7) surface-mount package, suitable for board-level integration.

Current Sensors Feature Summary

• High-precision linear Hall-effect technology ensures accurate current detection
• Integrated low-resistance copper conductor minimizes power loss
• Bidirectional sensing capability supports both positive and negative current flow
• Analog voltage output provides direct interface with control systems

Current Sensors Applications

• Motor drive current monitoring
• Power supply overcurrent protection
• Industrial automation load sensing
• Battery management system current tracking

Current Sensors Procurement Notes

Verify the specific suffix 'U3' against official Allegro MicroSystems documentation to confirm pinout compatibility and thermal characteristics. Ensure that the 7-PowerSMD package dimensions align with your PCB footprint requirements. Confirm that the operating temperature range meets your environmental specifications before finalizing procurement orders.

Current Sensors Selection Notes

Select this component when high accuracy and low conduction loss are critical for current sensing. The 200 µΩ conductor resistance makes it suitable for higher current applications where efficiency matters. Consider the 20 mV/A sensitivity for signal conditioning requirements. The bidirectional feature is essential for applications requiring reverse current detection.

Current Sensors Part Context

The ACS72981 series represents Allegro's advanced line of isolated current sensors, combining Hall-effect precision with integrated signal conditioning. This family offers improved accuracy and lower resistance compared to earlier generations, making it ideal for modern power electronics. The ACS72981LLRATR-100U3 specifically targets the 100 A range within this high-performance portfolio.

Current Sensors Replacement Considerations

Check Allegro's official substitution guide for compatible alternatives within the ACS72981 family. Verify that any substitute maintains the same 7-PowerSMD package and electrical characteristics. Cross-reference pin assignments and sensitivity values to ensure functional equivalence in existing designs.