LEM - HSU03: Smart current sensor with ratiometric functionality

LEM introduces the HSU03 product, a smart current sensor with advanced design, combining shunt technology and ratiometric Hall effect sensors

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The HSU03, with an advanced design combining shunt technology and ratiometric Hall effect sensors, offers highly accurate current measurement across a wide range of up to ±2000 A. It operates stably under extreme temperature conditions from –40 °C to +125 °C, with integrated 8 kV ESD protection and 4.2 kV RMS insulation, ensuring maximum safety for high-voltage applications. The ratiometric functionality ensures the output signal is proportional to the supply voltage, enhancing reliability and ease of integration into automotive electronics systems. From BMS to high-load current measurement systems, the HSU03 is the ideal choice for manufacturers needing a high-performance, stable current sensing solution that complies with stringent ISO 26262 safety standards.

Specifications:

– Measuring range: ±2000A, RMS 500A

– Accuracy: ±0.3% ratiometric

– Temperature range: –40°C to +125°C

– Safety standard: ISO26262; 4.2kV insulation

– Technology: Shunt + Hall ratiometric

– Easy integration: +5V power supply, common mechanical design

Why choose HSU03?

1. Specialized performance for electric vehicles

Measure DC & AC current up to ±2000A (10s), maximum RMS 500A — meets the standard for powerful and reliable car battery control.
Hybrid Shunt + Open-loop Hall effect technology, combining direct measurement via shunt and non-contact Hall sensor measurement, ensures diverse applications with high accuracy.

2. Outstanding accuracy & stability

Ratiometric error of only ±0.3%, sensitivity error ±1%, good linearity ±1% at ±1500A.
Very low temperature drift: ±0.04mV/°C offset, –0.03%/°C sensitivity, maintaining reliability under changing environmental conditions.

3. Durable & safe for harsh environments

Stable operation at –40°C to +125°C, ESD 8kV, insulation test 4.2kV RMS — meeting strict standards for automotive battery systems.
Complies with ISO26262 Functional Safety standards, ensuring the security of the vehicle’s electrical system.

4. Optimized design for manufacturing & integration

Simple +5V DC power supply, ratiometric design, easy to integrate into existing ECU/MCU.
Easy-to-install mechanical support shunt structure: fastened by M6/M8, suitable for flat busbar design (flatness ≤0.2mm).

5. Strategic applications in the industry

Battery Management System (BMS): accurate measurement of charge/discharge current, optimizing performance and safety.
Battery bridge/current: monitoring and disconnection in fault situations.
Electric vehicles, hybrid vehicles and electrified commercial vehicles: suitable for all harsh operating environments.