US-based Allegro MicroSystems, which supplies power and sensing solutions for motion control and energy-efficient systems, has introduced a 10 MHz magnetic current sensor featuring its XtremeSense tunneling magnetoresistance (TMR) technology.
The ACS37100 TMR current sensor is tailored to the needs of EVs and clean energy power conversion systems. It is designed to give designers precise control over the signal chain in power systems that use fast-switching GaN and SiC FETs. The automotive-grade 0 sensor can operate between -40° C and 150° C.
The sensor achieves a 50 ns response time, providing the high-fidelity data needed for efficiency and protection in demanding high-frequency applications while minimizing energy loss.
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 in GaN and SiC-based systems.
The device delivers low noise of 26 mA root mean square (RMS) across the full 10 MHz bandwidth, enabling precise, high-speed current measurements for more accurate and responsive system performance.
It delivers 1.2 mΩ internal conductor resistance and integrated reinforced isolation of 5 kV (60 seconds per UL 62368-1).
The ACS37100 is available in an industry-standard SOICW-16 package that supports a working reinforced isolation up to 565 VRMS (basic 1,097 VRMS) with 8 mm creepage and clearance. It features a voltage reference output and an adjustable overcurrent fault.
“The ACS37100 marks a critical inflection point for magnetic sensors. Our TMR technology is enabling current sensors that are 10 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.”
Source: Allegro MicroSystems
