First coreless TMR-based current sensing devices deliver accuracy and fast-response

Murata has released the MRD series of open-loop current sensors for industrial systems. Each incorporates high-performance TMR elements - allowing precision measurement concerning DC and AC currents up to 40A and sustaining stable characteristics over an extensive temperature range. This provides them with an industry-leading full-scale output accuracy of ±1% when operating between -40C and 105C, with a fast response time of 0.5μs (typical) also supported.

The coreless structure of these current sensors does not display hysteresis effects or saturation issues, typical side-effects with an iron core. It also results in smaller size and weight and makes mounting simpler. Their proprietary differential measurement with two TMR-based elements provides immunity against external magnetic stray fields. This makes them ideal for application environments with high levels of electromagnetic noise.

Because of the series' high accuracy current sensing capabilities and the fast response these devices can accomplish will be of notable value in various applications. These include photovoltaic inverters, DC-DC converters, EV charging infrastructure and power conditioning systems.

These current sensors are compliant with the UL62368-1 electrical equipment safety standard. These devices are supplied in SOICW16 packages and galvanic isolation over 4.8kV.