Allegro MicroSystems introduced the industry’s first commercially available magnetic current sensor to achieve 10MHz bandwidth featuring Allegro’s advanced XtremeSense TMR (tunnelling magnetoresistance) technology. The new ACS37100 TMR current sensor helps power system designers master the control signal chain and unlock the full potential of fast-switching GaN and SiC FETs. Tailored to the needs of electric vehicles (xEVs), clean energy power conversion systems, and AI data centre power supplies, the ACS37100 achieves an industry-leading 50ns response time, providing the high-fidelity data needed for optimal efficiency and protection in demanding high-frequency applications.
Migration to GaN and SiC promises greater power density and efficiency, but their faster switching speeds create significant control challenges. At sub-megahertz frequencies, conventional magnetic current sensors lack the speed and precision to provide the high-fidelity, real-time data required for stable control and protection loops. This can leave advanced systems vulnerable to damage and may prevent them from operating at their full potential.
The ACS37100 is engineered to solve this control challenge. Its industry-leading bandwidth and response time provide the high-fidelity current sense feedback essential for demanding control loops in high-speed switching applications. This magnetic current sensor enables designers to confidently and reliably control faster systems, maximise efficiency, and increase power density. Leveraging advanced TMR technology, the device delivers exceptionally low noise of 26mA root mean square (RMS) across the full 10MHz bandwidth – enabling precise, high-speed current measurements for more accurate and responsive system performance.
“The ACS37100 marks a critical inflection point for magnetic sensors. Our TMR technology is enabling current sensors that are ten times faster and four times lower noise versus typical Hall-based products,” said Matt Hein, Business Line Director of Current Sensors at Allegro. “This leap in performance solves important challenges in high-voltage power conversion, especially related to wide bandgap solutions.”
The ACS37100 is engineered to minimise energy loss while maximising operational efficiency and reliability, making it the ideal choice for a variety of automotive and industrial uses like xEV charging, clean energy power conversion, and AI data centre power supplies.
ACS37100 features and benefits
- Highest bandwidth: DC to 10MHz
- Fast response time: 50ns
- Low noise: 26mARMS at full 10MHz bandwidth
- Integrated Reinforced Isolation: 5kV (60seconds per UL 62368-1)
- Low loss: 1.2mΩ internal conductor resistance
- Automotive Grade 0: -40 to +150°C operating temperature range
