Melexis has introduced the MLX91224 and MLX91225 isolated current sensors for high-voltage automotive and industrial systems, with integrated current measurement up to 100 ARMS.
The new devices combine the current conductor, Hall sensing elements, signal conditioning and isolation within the package. Current flows directly through a low-impedance lead frame, while two sets of Hall plates differentially measure the magnetic flux generated by the current.
Using differential sensing minimizes the influence of external magnetic fields, while the sensors produce a high-speed linear analog output proportional to the measured current. Depending on the package, the platform supports working voltages up to 1640 VRMS.
Three Packages Cover Measurements up to 100 ARMS
Melexis offers the MLX91224 and MLX91225 in DE, DG and DH packages to address different current, isolation and surge-current requirements.
The compact DE version uses a SOIC6FL package and supports continuous operating current up to 50 ARMS, together with overcurrent detection. The DG version uses a wider SOIC16W package, increasing creepage and clearance while supporting a similar continuous current range.
For higher-current systems, the DH version uses a SOIC12W FL package and increases continuous operating current capability to 100 ARMS. Melexis specifies surge-current capability up to ±29 kA for this version.
3.3 V and 5 V Current Sensing
The MLX91224 is designed for systems using a 5 V supply, while the MLX91225 operates from 3.3 V. Both devices support AC and DC current measurement, bipolar or unipolar sensing, and ratiometric or fixed-output configurations.
A dedicated overcurrent detection pin is also included. Detection thresholds can be set internally or externally through the OCD-TH pin, giving designers an additional output for protection and current-monitoring functions. For automotive designs, the platform is ASIL B ready and has been developed as an ISO 26262 Safety Element out of Context. The sensors operate across an ambient temperature range of -40°C to +150°C.
Melexis is targeting the MLX91224 and MLX91225 at EV powertrains, electric drives, DC-DC converters, AC and DC chargers, solar systems, power supplies and data center power distribution, among other high-voltage current measurement applications.
The MLX91224 and MLX91225 are available now in all three package options.
Learn more and read the original announcement at melexis.com.
Technology Overview
The Melexis MLX91224 and MLX91225 are isolated Hall current sensors integrating the current conductor, sensing elements, signal conditioning and isolation within the package. Three package options support continuous current measurement up to 100 ARMS, with working voltages up to 1640 VRMS and surge-current capability up to ±29 kA.
FAQs
What is the difference between the MLX91224 and MLX91225?
The MLX91224 is designed for 5 V systems, while the MLX91225 supports 3.3 V systems. Both provide isolated Hall-based AC and DC current measurement.
How much current can the MLX91224 and MLX91225 measure?
The DE and DG package options support continuous operating current up to 50 ARMS, while the DH package extends the platform to 100 ARMS.
Are the MLX91224 and MLX91225 suitable for automotive applications?
Yes. Melexis developed the devices as ISO 26262 Safety Elements out of Context, and the platform is ASIL B ready. Applications include EV powertrains, motor control, DC-DC converters and charging systems.
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