HMSR 10-SM
10A rated ultra-compact AEC-Q100 Grade 1 current sensor for auxiliary systems and low-current EV applications
Product Overview
Description
The HMSR 10-SM is an ultra-compact automotive-grade current sensor designed for low-current applications in electric vehicles, including auxiliary systems, DC-DC converters, and control circuits. It meets AEC-Q100 Grade 1 qualification in a miniature surface-mount package.
Utilizing LEM's proprietary Hall effect ASIC technology, the HMSR 10-SM provides 1.5% accuracy, 2.5kV isolation, and single 3.3V or 5V supply operation. The surface-mount SOIC-16 package enables automated assembly and minimizes PCB footprint.
The HMSR 10-SM is ideal for applications such as 12V auxiliary current monitoring, low-voltage DC-DC converter feedback, heater control, pump and fan current sensing, and distributed current measurement throughout the vehicle. Its small size and low cost make it suitable for multi-sensor architectures.
Product Series
HMSR
Primary Application
Automotive Sensors
Key Features
- High efficiency and reliability
- Optimized for industrial applications
- Comprehensive technical support
- Available from stock
Specifications
| Rated Current | 10A |
|---|---|
| Measurement Range | ±25A |
| Supply Voltage | 3.3V or 5V |
| Output Type | Ratiometric Voltage |
| Accuracy | ±1.5% (-40°C to +125°C) |
| Response Time | 3.5 μs |
| Bandwidth | 100 kHz |
| Isolation Voltage | 2.5 kV |
| Operating Temperature | -40°C to +125°C |
| AEC-Q100 Grade | Grade 1 |
| Package | SOIC-16 Surface Mount |
Applications
Motor Drives
Variable frequency drives and servo motor controls
Power Supplies
SMPS, UPS, and industrial power systems
Renewable Energy
Solar inverters and wind turbine converters
EV Charging
Electric vehicle charging stations
FAE Expert Insights
"HMSR 10-SM is an excellent choice for industrial applications."
— Field Application Engineer, BeiLuo
Frequently Asked Questions
What makes HMSR 10-SM suitable for high-volume automotive production?
The HMSR 10-SM is optimized for high-volume automotive manufacturing: 1) SOIC-16 package - Standard surface-mount package compatible with high-speed pick-and-place equipment; 2) Reflow soldering - Compatible with standard Pb-free reflow profiles (260°C peak); 3) Tape and reel packaging - Standard 13-inch reels for automated feeding; 4) Automotive qualification - AEC-Q100 Grade 1 with full PPAP documentation; 5) Cost optimization - ASIC-based design minimizes component count and cost; 6) Quality consistency - Statistical process control ensures tight parameter distribution; 7) Supply security - High-volume production capacity with automotive supply chain management. These characteristics make the HMSR series ideal for EV programs expecting production volumes of 100,000+ units annually. The sensor can be placed by standard SMT equipment alongside other automotive ICs without special handling.
HMSR 10-SM is ideal for high-volume production due to standard SOIC-16 package and tape/reel packaging. Compatible with standard SMT assembly lines. Minimum order quantity is 100 pieces for production volumes.
How does the ratiometric output of HMSR 10-SM work?
The HMSR 10-SM features a ratiometric output where the output voltage is proportional to both the measured current AND the supply voltage. At zero current, output is Vcc/2. At +10A with 5V supply, output is approximately Vcc/2 + 2V = 4.5V. At +10A with 3.3V supply, output is approximately Vcc/2 + 1.32V = 2.97V. This ratiometric behavior provides inherent supply rejection - if the ADC reference is the same as the sensor supply, supply variations cancel out. This is particularly valuable in automotive systems where battery voltage (and thus 5V supply) may vary. To use ratiometric output effectively: 1) Use the same voltage reference for sensor supply and ADC reference; 2) The ADC reading directly is ratio of full scale, independent of actual Vcc; 3) No additional supply regulation or compensation is needed. This simplifies system design and improves accuracy in real-world automotive electrical environments.
Use the same voltage reference for both sensor supply and ADC reference to take advantage of ratiometric output. This eliminates errors from supply voltage variations common in automotive systems.
What PCB layout recommendations apply to HMSR 10-SM?
For optimal HMSR 10-SM performance: 1) Current path - Route the measured current through the dedicated high-current pins (typically pins 1-4 and 13-16), keeping traces short and appropriately sized for current; 2) Isolation - Maintain clearance between current-carrying traces and low-voltage circuitry per isolation requirements; 3) Decoupling - Place 100nF ceramic capacitor close to supply pins (typically pins 7 and 10); 4) Output routing - Keep output traces away from current paths to minimize crosstalk; 5) Thermal - The SOIC-16 package has limited heat dissipation; ensure conductor resistance doesn't cause excessive heating; 6) Grounding - Connect analog ground close to the sensor; avoid ground loops. The datasheet provides detailed pinout and recommended PCB footprint. Following these guidelines ensures the sensor meets its accuracy and isolation specifications.
Route high current through dedicated pins with adequate trace width. Place decoupling capacitor close to supply pins. Keep output traces away from current paths to minimize noise coupling.