LEM Introduces 800 V Current Sensor for Automotive Traction Inverters

LEM Introduces 800 V Current Sensor for Automotive Traction Inverters

LEM, a global leader in sensor solutions, has unveiled the HAH3DR S07/SP42, a new compact current sensor that is specifically engineered for 800V three-phase power modules. The newly launched sensor is compatible with popular industry modules and supports the transition to SiC MOSFET technology in 800V battery systems. It has a current sensing range from 1200 A to 1500 A and an insulation voltage of 3.5 kV.

The open loop Hall-based current sensor measures the magnetic field generated by the primary current flowing in a busbar inserted in the sensor slot and delivers a galvanically isolated output proportional to the primary current. The sensor can measure bidirectional DC and AC currents with output at 0.5 V for -IPN, 2.5 V at 0 A, and 4.5 V at +IPN.

With a ratiometric output, the current sensor can share the same power supply as the Analog to Digital Converter (ADC) and prevent further error during the signal conversion due to reference mismatch. The tightly controlled assembly and calibration of a LEM-designed magnetic core with a LEM proprietary ASIC results in low offset, excellent linearity, and high global accuracy specified over temperature and over a lifetime.

The HAH3DR family has been designed to achieve fast response time, a high bandwidth, and withstanding high dV/dt levels required for motor control applications. Because the mechanical integration of the sensor is key for a compact assembly, LEM has developed two distinct designs within the HAH3DR family:

The HAH3DR S07/SPx versions are specifically designed to fit within an inverter module such as the Infineon HybridpackTM Drive, with a press-fit connection to the gate driver board. The HAH3DR S0x versions are designed to fit on thick busbars and are available with a cable connector. S0x versions are specifically recommended to customers who are looking for a solution where the current sensor is located further away from the inverter module. The HAH3DR S07/SP42 is available with a busbar opening of 14.5 x 2.2 mm with a pitch/module busbar length of 47mm.

Features and Applications

  • Open loop hall effect current sensor
  • Capable of measuring bidirectional AC and DC current
  • Galvanic isolation
  • Ratiometric output
  • Up to 1200 A (1500 A ongoing development)
  • High global accuracy, high linearity, low offset specified over temperature and lifetime
  • Fast response time, high bandwidth
  • Excellent cross-talk immunity
  • Rugged against high dV/dt
  • Compact footprint for IGBT and SiC inverter power modules
  • Various mounting options
  • Automotive qualified
  • For traction inverters
  • Quality Managed products suitable for ISO 26262 safety-relevant applications within specific conditions


  • Country: Switzerland
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