Current Sense Resistors for Accurate Current Sensing

Current sense resistors are recognized as cost-effective components that enhance system efficiency and minimize power losses through high measurement accuracy compared to other technologies. Their principle is based on measuring the small voltage drop across a low-value resistor, which is directly proportional to the current flowing through the circuit.Current Sense Resistors (also known as Current Sensing Resistors) are engineered for precise current measurement, low temperature coefficient, and long-term stability, making them essential for battery management systems, motor control, and power monitoring. While widely used across consumer, industrial, and automotive markets, they are particularly valuable for developers requiring precise current detection in electronic designs. PROSEMI offers a comprehensive portfolio including metal foil, metal film, and metal strip resistors, with electron-beam welded shunt types available to meet diverse application requirements.

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Metal Current Sense Resistors
Features of Current Sense Resistors
  • Proprietary processing technique produces extremely low resistance values
  • Very low inductance
  • Low thermal EMF
  • Metallic Material
  • Thick copper conductor metallized material.
  • Ultra long term stability.
  • Halogen-free and lead-free RoHS compliant.
  • lStable materials. Excellent trustworthiness.
  • High power rating.
  • Ultra-low temperature drift (good TCR).
  • AEC-Q200 qualified Current Sensing Resistor
Advantages of Current Sense Resistors
  • Ultra-Low Resistance
  • High Accuracy
  • Proprietary Manufacturing Process
  • Capable of detecting large currents
  • Minimal impact on circuitoperation
  • Pure Alloy Metal Material
  • High production efficiency
  • Relatively low noise generated during current flow
Applications of Current Sensing Resistors
  • Battery Management Systems (BMS)
  • New Energy Vehicles
  • Power Supplies
  • LED Applications
  • Motherboards
  • Current Sensing and Voltage Dividing
  • Charging Stations, Chargers
  • Consumer Electronics
  • Lithium Battery Protection
  • Clean Appliances
  • Power Tools
  • Large Household Appliances
  • Smart Furniture
  • Smart Lithium-Ion Rechargeable Battery
  • Smart Electronic Charger
  • Monitoring Circuit

Related Products

Model Package Series TCR (ppm/℃) Resistance Value (mΩ) Power Rating (W or A) Tolerance(%) Automotive PDF
LMJ12 1206 LMJ12 ±50 1~100 1W ±0.5,±1,±2,±5 No
LMJ12 1206 LMJ12 ±380 1~100 1W ±0.5,±1,±2,±5 No
LMJ12 1206 LMJ12 ±50 101~200 0.5W ±0.5,±1,±2,±5 No
ALMJ12 1206 ALMJ12 ±150 1 1W ±0.5,±1,±2,±5 Yes
ALMJ12 1206 ALMJ12 ±380 1.5 1W ±0.5,±1,±2,±5 Yes
ALMJ12 1206 ALMJ12 ±100 2 & 2.5 1W ±0.5,±1,±2,±5 Yes
ALMJ12 1206 ALMJ12 ±50 101~200 0.5W ±0.5,±1,±2,±5 Yes
ALMJ12 1206 ALMJ12 ±50 3~100 1W ±0.5,±1,±2,±5 Yes
LMJ20 2010 LMJ20 ±50 1~100 1W & 1.5W ±0.5,±1,±2,±5 No
ALMJ20 2010 ALMJ20 ±50 1~100 1W & 1.5W ±0.5,±1,±2,±5 Yes
LMJ25 2512 LMJ25 ±100 0.75 2W & 3W ±0.5,±1,±2,±5 No
ALMJ25 2512 ALMJ25 ±100 0.5 3W ±0.5,±1,±2,±5 Yes
ALMJ25 2512 ALMJ25 ±50 1~10 2W ±0.5,±1,±2,±5 Yes
LMJ28 2818 LMJ2818 ±200 4~6 5W & 7W ±0.5,±1,±2,±5 NO
LMJ28 2818 LMJ2818 ±75 7~50 5W & 7W ±0.5,±1,±2,±5 NO
ALMJ28 2818 ALMJ28 ±75~200 4~50 5W ±0.5,±1,±5 Yes
LMP25 2512 LMP25 ±50 1~4 2~100 2W & 3W ±0.5,±1,±2,±5 No
LMP25 2512 LMP25 ±50 101-500 2W ±0.5,±1,±2,±5 No

products cate

Types of Current Sense Resistors

Metal Alloy Current Sense Resistors

Metal Alloy Current Sense Resistors

Metal Alloy Current Sense Resistors feature precision alloy strips for high accuracy, low resistance (0.2–500 mΩ), and stable performance under high loads. Their robust design ensures reliability in applications like battery management, automotive, DC-DC converters, and motor drives.

High Power Handling Excellent Stability Accurate Current Sensing
Metal Alloy Current Sense Resistors

Slim Metal Alloy Current Sense Resistors

Slim Metal Alloy Current Sense Resistors

Slim Metal Alloy Current Sense Resistors feature a compact profile for space-limited PCBs. Despite their thin size, they offer precise current detection, low inductance, and high reliability. With resistance down to 1 mΩ, they suit portable devices, battery systems, and compact automotive modules needing precision and space efficiency.

Compact / Slim Form Factor Precision Current Monitoring Enhanced Heat Dissipation
Slim Metal Alloy Current Sense Resistors

Metal Alloy Current Shunt Resistors

Metal Alloy Current Shunt Resistors

Metal Alloy Shunt Resistors are designed for high-current measurement with resistance from 25 μΩ to 5 mΩ. Using electron beam welding of copper and alloy strips, they deliver excellent heat dissipation, low thermal EMF, and stable continuous performance. Common uses include BMS, energy storage, automotive powertrains, and industrial equipment requiring accuracy and durability.

Low Resistance High Current Detection Linearity
Metal Alloy Current Shunt Resistors

Metal Foil Current Detection Resistors

Metal Foil Current Detection Resistors

Metal Foil Current Detection Resistors deliver ultra-high precision and extremely low temperature coefficient (TCR), making them suitable for demanding applications where accuracy and stability are essential. They are typically used in measurement equipment, medical devices, and precision power supplies.

Ultra-Low Resistance Micro-Ohm Sensing Extremely Low TCR
Metal Foil Current Detection Resistors

Metal Film Current Sensing Resistors

Metal Film Current Sensing Resistors

Metal Film Current Sensing Resistors are high-precision resistors with a metal film on an insulating substrate, offering tight tolerance, low noise, and stable temperature performance. With resistance from 1 mΩ to 10 Ω, they provide reliable current sensing, accurate voltage monitoring, and consistent operation, combining durability, precision, and low drift for versatile current sensing applications.

High Precision Tight Tolerance Temperature Stability
Metal Film Current Sensing Resistors

Professional Solutions

Professional Solutions
We specialize in providing one-stop, diversified precision low-resistance current sensing components and integrated circuit protection solutions to meet the diverse needs of the market. Our commitment to quality and innovation ensures reliable performance and long-term stability for every application.
One-Stop Solutions Reliable Quality Innovative Design
Professional Solutions

Comparison of Current Sense Resistors 

Type Resistance Range Key Features Typical Applications
Metal Alloy Current Sense Resistors 0.2 mΩ ~ 500 mΩ Low resistance, high accuracy, low TCR, cost-effective Consumer electronics, industrial control, automotive electronics
Slim Metal Alloy Current Sense Resistors 1 mΩ ~ 50 mΩ Ultra-thin design, space-saving, low inductance, reliable Portable devices, battery-powered systems, compact automotive modules
Metal Alloy Shunt Resistors 25 μΩ ~ 5mΩ High-current handling, electron-beam welded, excellent heat dissipation, low thermal EMF BMS, energy storage, automotive powertrain, industrial equipment
Metal Foil Current Detection Resistors 3 mΩ ~ 910 mΩ (typical) Ultra-high precision, extremely low TCR, stable over time Measurement equipment, medical devices, precision power supplies
Metal Film Current Sensing Resistors 10 mΩ ~10 Ω(typical) Good balance of accuracy, reliability, cost-effective Consumer electronics, power modules, industrial control circuits

product advantages

PROSEMI TECHNOLOGY

At PROSEMI, we don’t just manufacture resistors — we engineer reliable soluti ons that empower your designs with precision, efficiency, and long-term performance.If you have any products in need, please feel free to contact us.
Leading Chinese Manufacturer of Precision Current Sense Resistors

Leading Chinese Manufacturer of Precision Current Sense Resistors

Specializes in full-size micro-resistance SMD precision alloy current sense resistors Package range: 0402, 1206, 2512, 5930 Three advanced technology platforms supporting diverse application needs.
Leading Chinese Manufacturer of Precision Current Sense Resistors

Advanced Ultra-Thin Metal Strip Processing

Exclusive capability in China for processing ultra-thin strips < 0.3mm (as thin as 0.1mm) Already in mass production with stable supply capacity Provides high precision and reliability for power management and battery systems.
Leading Chinese Manufacturer of Precision Current Sense Resistors

Exclusive Electron Beam Welding Technology

The only Chinese manufacturer with electron beam continuous welding production line Supports ultra-thin thicknesses between 0.3mm and 1mm Ensures strong, consistent, and durable product performance
Leading Chinese Manufacturer of Precision Current Sense Resistors

Commitment to Quality and Sustainability

Focus on precision engineering and product stability Dedicated to green production and environmental responsibility Long-term partner for global electronics and energy industries.

Frequently Asked Questions

What Is A Current Sensing Resistor And Why Is It Important?

A current sensing resistor is a low-value precision resistor used to measure current by detecting the voltage drop across it. It is essential for safe and efficient power management in modern electronics.

Consider resistance value, power rating, tolerance, TCR, and package size. Matching these parameters with your circuit ensures accurate measurements and reliable performance.

PROSEMI offers advanced manufacturing expertise and reliable large-scale supply, making it a trusted partner for customers worldwide.

Relevant Cases

PROSEMI electronic components are widely applied across multiple fields, ensuring the safe and efficient operation of equipment, and gaining trust within the industry.
Prosemi Successfully Exhibits At Electronica China 2025, Showcasing Strength In Precision Current Sensing Resistors

Prosemi Successfully Exhibits At Electronica China 2025, Showcasing Strength In Precision Current Sensing Resistors
Prosemi Technology Successfully Exhibits At The 13th China Information Technology Expo, Showcasing High-precision Detection Capabilities

Prosemi Technology Successfully Exhibits At The 13th China Information Technology Expo, Showcasing High-precision Detection Capabilities
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