3920 0.005Ω (5mΩ) 3W Karma Alloy Metal Shunt Resistor for Precision Current Sensing
Specifications
Features:
High Power,Low Temperature
Name:
Current Shunt Resistor
Manufacturer:
Ellon
Series:
ESR
Size:
3920
Resistance Range:
5mΩ(0.005 Ohm)
Tolerance:
±1%
Power Rating:
3W
Operating Temperature Range:
-55°C To +175°C
Temperature Coefficient:
±50 Ppm/°C
Material:
Karma
Per Reel:
2000
Applications:
Current Sensing, Power Supplies, Motor Control, Battery Management
Highlight:
3920 Current Shunt Resistor
,Metal Chip Shunt Resistor
,Chip Shunt Resistor 3W
Introduction
Unlocking Precision Power Measurement: A Deep Dive into the 3920 0.005Ω (0.005m Ohm) 3W Metal Shunt Resistor
In the demanding world of modern electronics, accurate current sensing is a cornerstone of efficiency, control, and safety. From robust battery management systems in electric vehicles to high-density power supplies in industrial automation, the ability to precisely measure current flow is essential. At the heart of these applications lies a critical component: the current shunt resistor. The 3920 0.005Ω (0.005m Ohm) 3W Metal Shunt Chip Resistor, exemplified by models like the ESR39F3WR005K02G, represents the pinnacle of performance for high-power, high-precision applications.
Technical Specifications
| Parameter | Specification |
|---|---|
| Resistance Value | 0.005Ω (5mΩ) |
| Tolerance | ±1% |
| Power Rating | 3W |
| Package Size | 3920 (6.35mm × 3.15mm) |
| Temperature Coefficient (TCR) | ±50 ppm/°C |
| Resistance Material | Manganese Copper (Karma) alloy |
| Operating Temperature | -55°C to +175°C |
Understanding the Core Specifications
The part number reveals a compelling story of capability. Let's examine the key parameters that make this resistor a preferred choice for engineers.
- 3920 Package Size: Measuring 3.9mm in length and 2.0mm in width, this substantial surface-mount component excels at heat dissipation. The larger surface area enables superior thermal management, crucial for handling high currents and the 3W power rating.
- 0.005Ω Ultra-Low Resistance: This exceptionally low resistance value (equivalent to five milliohms) minimizes voltage drop and power loss in high-current circuits, making it ideal for precision current sensing applications.
- 3W Power Rating: This significant rating ensures reliable operation under continuous load and transient peaks, providing a comfortable safety margin for high-current applications.
- 1% Tolerance & Low TCR: The ±1% tolerance on an ultra-low value represents high manufacturing precision, while the low Temperature Coefficient of Resistance maintains accuracy across wide temperature variations.
Advanced Technology and Construction
The exceptional performance of resistors like the ESR39F3WR005K02G is engineered through advanced materials and design.
- Karma Alloy Material: This nickel-chromium-aluminum alloy offers excellent long-term stability and very low TCR, providing superior resistance to oxidation and aging compared to traditional materials.
- Metal Shunt Design: Featuring four-terminal (Kelvin) connection style, this design separates high-current load terminals from precision voltage sensing terminals, eliminating measurement errors caused by lead and trace resistance.
- Low ESR: The pure, low-ohmic value with minimal parasitic inductance ensures accurate AC or switching current measurement.
- High Surge Immunity: Robust construction and Karma alloy element provide strong protection against sudden current surges common in motor start-ups, power supply in-rush, or fault conditions.
Compliance and Environmental Commitment
Fully compliant with RoHS and REACH regulations, this resistor meets global standards for lead-free and environmentally conscious manufacturing. Its construction is designed for compatibility with lead-free soldering processes.
Key Application Areas
- Automotive and Electric Vehicle Systems: Precise current monitoring in battery management systems, motor controllers, and onboard chargers
- Industrial Robotics and Automation: Accurate current feedback for servo motor drives and power inverter control
- Telecommunications and Server Power Supplies: Load monitoring and over-current protection in high-density DC-DC converters
- Renewable Energy Systems: Maximum power point tracking in solar inverters and charge controllers in wind energy systems
- High-Current Battery-Powered Equipment: Battery usage monitoring in professional power tools, electric scooters, and drones
Conclusion
The 3920 0.005Ω 3W Metal Shunt Chip Resistor is a highly engineered solution for precision current measurement. Its robust package enables high power dissipation while ultra-low resistance minimizes system losses. Built with stable Karma alloy and featuring precision tolerance, it offers the accuracy and ruggedness required by today's most advanced power electronics. For design engineers optimizing performance in high-current applications, this metal shunt resistor represents an optimal blend of size, power, precision, and resilience.
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Stock:
MOQ:
2000
