Isolated current sensors deliver measurements up to 100 ARMS, fast response, and safety features for electric vehicles, chargers, converters, solar systems, and industrial power applications.
Melexis has introduced the MLX91224 and MLX91225 isolated current-sensor ICs, expanding its current-sensing portfolio for high-voltage automotive and industrial systems. The devices provide plug-and-play current measurement up to 100 ARMS, with integrated sensing, signal conditioning and galvanic isolation in compact SOIC packages.
The new platform combines a low-impedance current conductor with Hall sensing elements that differentially measure the magnetic field generated by current flow. This architecture supports high-speed linear analogue output while reducing the need for separate isolation components and simplifying system integration. Package-dependent isolation ratings support working voltages up to 1640 VRMS.
For automotive applications, the MLX91224 and MLX91225 are developed as ISO 26262 Safety Elements out of Context and provide ASIL B readiness for high-voltage current measurement. The platform also incorporates overcurrent detection to support protection and monitoring functions in safety-related systems.
The devices are offered in three package options. The DE package supports continuous current measurement up to 50 ARMS in an SOIC6FL format, while the DG variant provides extended creepage and clearance in an SOIC16W package. The DH package supports up to 100 ARMS in an SOIC12W FL package and surge-current ratings up to ±29 kA.
The sensors support both AC and DC current measurement, along with bipolar or unipolar sensing and ratiometric or fixed output configurations. The MLX91224 operates from a 5V supply, while the MLX91225 is designed for 3.3V systems. Both offer a 400kHz bandwidth and 2µs response time, with an operating temperature range from -40°C to 150°C.
Melexis targets the devices at EV powertrains, electric drives, AC and DC chargers, DC-DC converters, solar systems, power supplies, data-centre power distribution units, and demand or load control applications.
