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Automotive Current Sensor IC with Fast Overcurrent Fault and Common-Mode Rejection

ACS71240

The ACS71240 offers a robust and precise current sensing solution for automotive applications, featuring differential sensing for common-mode rejection, a fast overcurrent fault output, and high accuracy (±1%) for reliable operation.

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Evaluation Board

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Top Features

Packaging

AEC-Q100 qualified
Differential Hall sensing rejects common-mode stray magnetic fields
Overcurrent FAULT with a Factory Programmable trip range of 50% to 200% of full-scale current
Non-Ratiometric output provides immunity to noisy supplies
Galvanically Isolated:
- QFN package: 120VDC working voltage
- SOIC8 package: UL certified to 2400VRMS, working voltage of 420VDC or 297VRMS
Reduced Power Loss:
- 0.6 mΩ internal conductor resistance on QFN package
- 1.2 mΩ internal conductor resistance on SOIC8 package
Integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients
Output voltage proportional to AC or DC current
High-bandwidth 120 kHz analog output for faster response times in control applications
Factory-trimmed sensitivity and quiescent output voltage for improved accuracy
3.3 and 5 V single supply operation
Small footprint, low-profile QFN and SOIC8 packages suitable for space-constrained applications

The tiny 3mm x 3mm, wettable flank QFN package can be used on voltage rails up to 120VDC and enables solder joint inspection required in zero PPM automotive applications. The standard footprint SOIC8 package is UL certified to 2400VRMS of isolation and offers a working voltage of 420VDC or 297VRMS.

LC Package Documentation

EX Package Documentation

Part Number Specifications and Availability

Discover Allegro's Advanced Magnetic Current Sensors!

Upgrade your designs with efficient, compact, and integrated solutions. Simplify your circuits and reduce component count with Allegro's innovative sensor technology.

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Documentation and Resources

Documentation

Design Tools

Third Party Design Tools

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All Types Application Note Blog Brochure Certificate FAQ Guide Technical Article

Documents Found: 32

Document Type	Document Name
Application Note	How to Analyze and Compare Allegro Current Sensor and ADC Error Components
Application Note	Managing External Magnetic Field Interference When Using ACS71x Current Sensor ICs
Application Note	Current Sensing in Motor Drives
Application Note	Package Thermal Resistance for Allegro Current Sensors with Integrated Conductors
Application Note	Glossary of Isolation-Related Terms for Integrated Current Sensors
Blog	January 07, 2025 Magnetic Sensors are a Great Alternative to Traditional Shunt Resistors for Industrial Current Sensing
Brochure	Brochure: Driving Change by Advancing Personal Mobility Through Cutting-Edge Technology
Brochure	Enhancing Robotic Design
Certificate	Certificate CB US 42876 UL LC Package
Certificate	Certificate of Compliance 20181207-E316429
FAQ	Current Sensors FAQ
Guide	ACS71240 Samples Programmer
Technical Article	Common Driver Platform for 12V and 48V Systems Simplifies EV Starter Generator Designs
Technical Article	Overcoming Size Challenges in PCB Design with Magnetic Current Sensors

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All Types Gerber File Simulation Tool Webpage

Documents Found: 32

Document Type	Document Name
Gerber File	ASEK71240EX Gerber Files
Gerber File	ASEK71240LC Gerber Files
Simulation Tool	Current Sensor Error and Resolution
Webpage	Current Sensor Evaluation Boards Page

Pololu Carrier Board

Mikroe Demoboard ACS71240

This board is a simple carrier of Allegro’s ACS71240KEXBLT-010B3 Hall effect-based linear current sensor, which offers a low-resistance (~0.6 mΩ) current path and a high 120 kHz bandwidth for fast response times.

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