Prosemicsr Current Sensing Resistors For Automotive Applications
Prosemicsr has multiple part series for Current Sense resistor applications. prosemicsr produces Current Sense resistors down to ultra-low values resistors while still maintaining resistive stability. prosemicsr Current Sense resistors are offered in two and four terminal configurations. Due to multiple mountings, constructions, and configurations, prosemicsr is confident customers will find the proper Current Sense resistor required to fit their needs.
Key Benefits
Accurate Overcurrent Protection
By converting current into a proportional voltage drop, shunt resistors enable real‑time detection of overcurrent or short‑circuit events in battery management systems (BMS) and powertrain controllers.
Enhanced Efficiency
Ultra‑low resistance values (down to sub‑milliohm) minimize insertion loss, preserving overall system efficiency—vital for electric vehicles (EVs) where every milliwatt counts.
Fast Transient Response
Minimal inductance ensures that rapid current spikes (e.g., during motor startup or regenerative braking) are faithfully tracked, supporting precise torque control and stability.
Thermal Stability & Durability
Low thermal EMF and robust metal construction provide consistent readings across -40 °C to +150 °C, meeting stringent AEC‑Q200 automotive standards and ensuring long‑term reliability under harsh conditions.
Typical Automotive Use‑Cases
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Battery Management Systems (BMS): Monitoring cell balancing and state‑of‑charge (SoC) to extend battery lifespan.
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Electric Power Steering (EPS): Measuring motor currents for responsive steering torque and fault detection.
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Infotainment & ECU Modules: Ensuring stable power delivery to sensitive digital and analog circuits.
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Advanced Driver‑Assistance Systems (ADAS): Providing current feedback for LIDAR, radar, and vision processing units.
Selection Guidelines
| Parameter | Recommendation for Automotive |
|---|---|
| Resistance Range | 0.5 mΩ – 100 mΩ |
| Power Rating | 0.25 W – 2 W (derated per temperature) |
| T.C.R. | ≤ ±100 ppm/°C |
| Operating Temperature | -40 °C to +150 °C |
| Qualification | AEC‑Q200 |
When choosing a current sensing resistor, balance a low resistance value (for efficiency) against adequate power rating and thermal stability. Ensure AEC‑Q200 qualification for guaranteed performance under automotive environmental stresses.