Revolutionizing Power Electronics: Allegro Unveils Groundbreaking 10 MHz TMR Current Sensor

In a monumental stride for power electronics, Allegro MicroSystems, a global leader in sensing and power IC solutions, has unveiled a game-changing innovation: the AACS-30070. This isn't just another sensor; it's the industry’s first production-ready 10 MHz Tunnel Magneto-Resistance (TMR) current sensor, designed to unleash the true potential of next-generation Wide Bandgap (WBG) power electronics.

With its unparalleled speed and precision, the AACS-30070 is poised to redefine protection and control in high-performance applications.

The rise of Wide Bandgap devices like Silicon Carbide (SiC) and Gallium Nitride (GaN) has been heralded as a revolution, promising unprecedented efficiency and power density.

However, their ultra-fast switching speeds—often reaching into the megahertz range—have presented a significant challenge for conventional current sensing technologies. Precise and high-bandwidth current sensing is paramount for real-time monitoring, rapid fault detection, and optimal control, ensuring both performance and safety.

Allegro’s AACS-30070 directly addresses this critical need, pushing the boundaries of what's possible in power system design.

At the heart of the AACS-30070’s breakthrough performance lies its cutting-edge TMR technology, delivering an astounding 10 MHz signal bandwidth. This high bandwidth is crucial for accurately capturing the fast current transients inherent in WBG switching, enabling designers to achieve superior efficiency, reduce switching losses, and enhance overall system reliability.

Beyond speed, the AACS-30070 boasts exceptional accuracy, ensuring precise current measurement even in demanding environments. Its architecture features an integrated current path and galvanic isolation, providing robust protection while simplifying system design and reducing component count.

The benefits of this advanced sensor extend far beyond its core specifications.

The AACS-30070’s superior signal-to-noise ratio translates into higher resolution, allowing for more granular control and optimization of power systems. Its robust design ensures excellent thermal performance up to 150°C, making it suitable for harsh industrial and automotive applications. Furthermore, the sensor’s enhanced common-mode field rejection capability provides immunity to stray magnetic fields, a common issue in dense power electronics layouts, ensuring stable and reliable measurements.

The potential applications for the AACS-30070 are vast and transformative.

In data centers, it will enable more efficient power supplies, reducing energy consumption and operational costs. For the burgeoning electric vehicle (EV) charging infrastructure, it will facilitate faster and safer charging solutions. In 5G telecom, industrial automation, and renewable energy inverters, this sensor will empower designers to create smaller, lighter, and significantly more efficient power conversion systems.

Its AEC-Q100 qualification further underscores its readiness for critical automotive applications, ensuring long-term reliability and performance.

Mark Kidger, Senior Vice President, Current Sensors at Allegro, emphasized the significance of this launch: "The market has been eagerly awaiting current sensing solutions that can keep pace with the incredible speeds of SiC and GaN devices.

Our new 10 MHz TMR current sensor, the AACS-30070, is a direct response to this demand, offering unmatched performance for next-generation WBG designs. This innovation underscores Allegro's commitment to delivering high-performance, production-ready solutions that accelerate our customers' success in rapidly evolving markets."

With samples of the AACS-30070 currently available, and full production slated for Q1 2026, Allegro MicroSystems is not just introducing a new product; it’s setting a new benchmark for precision and control in the world of high-speed power electronics.

The AACS-30070 is truly an enabler for the future of efficient power conversion, allowing engineers to fully harness the power of WBG technologies to build a more efficient and sustainable world.