A new magnetic current sensor has been introduced by Allegro Microsystems that delivers a 10 MHz bandwidth using tunneling magnetoresistance (TMR) technology. The device is intended for power system engineers developing high-frequency designs such as electric vehicle inverters, renewable energy converters, and data center power supplies.
The sensor provides a 50 ns response time and 26 mA RMS noise across its full bandwidth. These characteristics support stable, high-fidelity current feedback in applications using fast-switching wide bandgap transistors such as gallium nitride (GaN) and silicon carbide (SiC) devices. Conventional magnetic current sensors, typically based on Hall technology, often lack sufficient bandwidth for such high-speed control loops.
By using TMR sensing, the device enables precise current measurements at high frequencies while maintaining low loss through a 1.2 mΩ internal conductor. This performance allows engineers to optimize switching behavior and improve efficiency in power-dense systems. Reinforced isolation rated to 5 kV for 60 seconds and compliance with UL 62368-1 provides electrical safety for automotive and industrial environments.
The sensor operates across an automotive Grade 0 temperature range from −40 °C to +150 °C and is housed in a standard SOICW-16 package. The package design provides 8 mm creepage and clearance with reinforced isolation up to 565 VRMS (basic 1,097 VRMS). Additional features include an integrated voltage reference output and an adjustable overcurrent fault pin to support system protection.
The device is available now, along with datasheets, samples, and evaluation boards, through the manufacturer’s website.
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