Sensors extend current measurement to 100 A

The Melexis MLX91224 and MLX91225 isolated Hall current sensors measure up to 100 A_RMS in automotive and energy applications. Offered in three compact SOIC packages, each device integrates a current conductor, sensing element, signal conditioning, and galvanic isolation. This integration minimizes ohmic losses and simplifies designs for EV powertrains, DC/DC converters, chargers, and solar systems.

The integrated current path runs directly through the package’s low-impedance lead frame, while two sets of Hall plates differentially sense the magnetic flux generated by the current. Differential sensing minimizes disturbance from external magnetic fields and enables a high-speed linear analog output proportional to the measured current. Package-dependent isolation ratings allow working voltages up to 1640 V_RMS.

Developed as an ISO 26262 ASIL B Safety Element out of Context (SEooC), the sensors support safety-related current measurement in high-voltage automotive systems. The MLX91224 is designed for 5-V systems, while the MLX91225 is designed for 3.3-V systems. Both devices offer AC and DC current measurement, bipolar or unipolar sensing, and ratiometric or fixed output configurations.

Engineering samples of the MLX91224 and MLX91225 are available in limited quantities.

Melexis

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