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HMSR Series

The HMSR is a new generation of high insulated Integrated Current Sensor from LEM. These product family provides a robust, compact and very accurate solution for measuring DC and AC currents in all highly demanding, switching power applications for commercial and industrial markets. HMSR is a micro core based open loop sensor with a reinforced insulation and overcurrent detections (user configurable and factory set). These features make the device suitable for high voltage applications requiring high precision and strong immunity against external field. The primary conductor (pins 1 and 8) has very low electrical resistance and dedicated pads designed to withstand against high surge currents such as lightning strikes. HMSR is measuring the magnetic field generated by the current flowing in the copper primary path of the device. By using a micro magnetic core, HMSR is immune to the external fields, making the device well suited for power electronic applications with high levels of disturbance. The reinforced isolation between primary (pins1 and 8) and secondary (pins 9 to 15) offers the HSMR, a small, cost effective solution to measure high side current compared to resistive isolated solutions.

HMSR Series

Main characteristics:

  • IC SO16 packaging for SMD automatic assembly
  • Only 6 mm height
  • Non-contact AC&DC current measurement for 6, 8, 10, 15, 20 or 30 A nominal
  • 0.5% typical accuracy into the operating temperature range
  • 2 µs response time
  • Cost effective
  • 8 mm creepage and clearance distances + CTI 600
  • Reinforced insulation according to the IEC 60950-1 standard (4950 VRMS isolation test voltage)
  • High performance gain and offset thermal drifts
  • Operating temperature range: -40°C to +125°C


  • Unique primary conductor included
  • Overload current bursts withstand of up to 20 kA (8-20 us)
  • Excellent immunity to external fields
  • DC to 270 kHz
  • +5V power supply
  • Analog voltage output 800 mV @ IPN
  • Double overcurrent detection outputs
  • Photovoltaic, white goods, windows shutters, air-conditioning, high switching frequencies drives application

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