Allegro Microsystems Launches Industry-First 10 MHz TMR Current Sensor for Wide Bandgap Power Systems

Allegro Microsystems has introduced the ACS37100, the first production-ready magnetic current sensor with a 10 MHz bandwidth, specifically engineered for high-speed GaN and SiC power designs. This breakthrough addresses the growing demand for ultra-fast, high-fidelity current sensing in electric vehicles, renewable energy systems, and data centers.

Wide bandgap (WBG) semiconductors like Gallium Nitride (GaN) and Silicon Carbide (SiC) are transforming power conversion with their ability to switch faster, operate at higher voltages, and deliver greater efficiency than traditional silicon devices. However, their speed introduces new challenges for current sensing—especially in maintaining stable control loops and protecting against fault conditions.

Allegro’s new sensor directly tackles these issues with:

• 10 MHz bandwidth: Enables precise tracking of ultra-fast switching events in GaN and SiC circuits
• 50 ns response time: Supports real-time fault detection and protection
• 26 mA RMS noise: Ensures clean signal acquisition for high-performance control

At the heart of the ACS37100 is Allegro’s proprietary XtremeSense™ TMR (Tunneling Magnetoresistance) technology. Compared to Hall-effect sensors, TMR offers:

• Higher sensitivity and bandwidth
• Lower latency for fast transient response
• Improved thermal stability across wide operating conditions

This makes it ideal for next-gen power systems where signal integrity and speed are paramount.

The ACS37100 is designed for integration into:

• EV traction inverters and onboard chargers
• Solar inverters and energy storage systems
• Data center power supplies using GaN/SiC FETs

Its compact footprint and digital output options simplify system design while enhancing performance.

By delivering the first commercially available 10 MHz magnetic current sensor, Allegro is setting a new benchmark for sensing in WBG applications. This innovation not only improves control accuracy but also enhances system protection and efficiency—critical for the future of electrification and high-performance computing.ncy and performance.ute capabilities.

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