Allegro MicroSystems has introduced the industry’s first mass-produced 10 MHz TMR current sensor, delivering precise protection and control for
2025-10-23
New Generation XtremeSense ™ TMR current sensor provides high fidelity current signals for designs using GaN and SiC FET in electric vehicles, clean energy, and data centers, helping engineers accurately control the power conversion signal chain
Manchester, New Hampshire, USA, October 21, 2025 – Allegro MicroSystems, Inc. (hereinafter referred to as "Allegro", NASDAQ stock code: ALGM), the world's leading supplier of power and sensing solutions for motion control and energy-saving systems, today launched the industry's first mass production 10MHz bandwidth magnetic current sensor ACS37100, which is based on Allegro's advanced XtremeSense ™ Tunnel magnetoresistance (TMR) technology. With the help of this new ACS37100 TMR current sensor, power system design engineers can accurately control the control signal chain and fully utilize the potential of GaN (gallium nitride) and SiC (silicon carbide) field-effect transistor fast switching devices. The all-new ACS37100 is designed specifically for the needs of electric vehicles (xEVs), clean energy power conversion systems, and AI data center power supplies. With an industry-leading 50 ns response time, it provides high fidelity data support for demanding high-frequency applications, achieving better efficiency and system protection performance.
With the migration of power devices to GaN and SiC technologies, the power density and efficiency of the system have significantly improved, but the control complexity brought by high-speed switching has also increased. In the sub megahertz frequency band, traditional magnetic current sensors often fail to provide real-time high fidelity data required for control and protection loops due to insufficient speed and accuracy, resulting in limited system performance and even potential damage risks.
ACS37100 was born to address this core challenge. Its leading bandwidth and response speed provide high fidelity current sensing feedback for highly demanding control loops in high-speed switch applications. With the help of this sensor, design engineers can reliably control high-speed systems, achieving higher energy efficiency and power density. With advanced TMR technology, the device achieves ultra-low noise of only 26 mA RMS within the full bandwidth range of 10 MHz, enabling more accurate and sensitive current measurement, ensuring faster and more stable system response.
Matt Hein, Business Line Director of Allegro Current Sensors, stated, "ACS37100 marks a critical turning point in magnetic sensor technology. Allegro's TMR technology increases the speed of current sensors by 10 times compared to traditional Hall effect products, while reducing noise by a quarter. With the significant improvement in performance, new solutions have been brought to the field of high-voltage power conversion, especially for wide bandgap applications.
ACS37100 is designed to minimize energy loss while improving operational efficiency and reliability, making it an ideal choice for various automotive and industrial applications such as electric vehicle charging, clean energy power conversion, and AI data center power supply.
Main features and advantages of ACS37100
• Extremely high bandwidth: DC to 10 MHz
Quick response time: 50 ns
• Ultra low noise: only 26 mARMS at 10 MHz full bandwidth
• Integrated enhanced isolation: 5 kV (60 seconds, compliant with UL 62368-1 standard)
Low loss: 1.2 m Ω internal shunt resistor
Automotive Grade 0 standard: Operating temperature range -40 ° C to+150 ° C
ACS37100 adopts the industry standard SOICW-16 package, supporting working voltages up to 565 VRMS (enhanced isolation) and 1097 VRMS (basic isolation), with a creepage distance and electrical clearance of 8 mm. In addition, it also integrates voltage reference output and adjustable overcurrent fault detection function.
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