SMU – Single Monitoring Unit for Automotive applications
The SMU, or Single Monitoring Unit, is LEM’s latest current sensor designed for DC measurement in high-voltage automotive applications (400V, 800V). It provides galvanic isolation between the primary (high voltage) and secondary (electronic) circuits.
The SMU family offers a variety of current measurement ranges within the same housing, up to ±1500 A.
These automotive current sensors feature high insulation levels and operate within a temperature range of -40°C to +125°C.
Designed for primary fastening installation, SMU sensors use Hall effect (open loop) technology, ensuring dependable and precise current measurements for electric vehicle applications.
SMU – Features and benefits
Main characteristics
- Open Loop using the Hall effect sensor
- High insulation level
- Unipolar +12V DC power supply
- Primary current measuring range up to ±1500 A
- Maximum RMS primary admissible current: defined by the busbar, the magnetic core or ASIC T < +125 °C
- Operating temperature range: ?40 °C < T < +125 °C
- Digital output: LIN or UART protocol
- ASIL B compliant
Benefits
- Excellent accuracy
- Very good linearity
- Very low thermal offset drift
- Very low thermal sensitivity drift
- No insertion losses
Typical applications
SMU sensors, known for their capability to measure DC, are widely utilized in a range of automotive applications.
These sensors are ideal for use in the following areas:
- Battery management
- EV, Hybrid and utility vehicles
- Battery storage
LEM SMU – Download & Technical Characteristic
| Product | Document | Primary nominal RMS voltage | Supply Voltage range | Op. Temperature |
|---|---|---|---|---|
| SMU | Datasheet 3D Application Notes | 1500 A | +12V | -40 to 125 °C |
SMU Sensors – ASK FOR SAMPLES / QUOTATIONS
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