3920 0.005R (5m Ohm) 3W 1% Metal Shunt Chip Resistor for High Current Sensing

In high-current circuit scenarios such as new energy vehicles, industrial power supplies, energy storage devices, and electric tools, the 3920 0.005R (5m Ohm) 3W 1% ESR39F3WR005K02G Metal Shunt Chip Resistor has become a core preferred component for current sampling, circuit shunting, and overload protection, thanks to its ultra-low resistance, high power capacity, high precision, and strong environmental adaptability. Manufactured with Karma material, this 3920 0.005R 3W resistor fully complies with RoHS, REACH, and lead-free environmental protection requirements. With the core advantages of low temperature drift, high precision, and strong surge resistance, it adapts to circuit applications under various harsh working conditions and is a benchmark product among industrial-grade high-power low-resistance resistors.

The basic specification design of the 3920 0.005R (5m Ohm) 3W 1% ESR39F3WR005K02G Metal Shunt Chip Resistor fully meets the core requirements of low resistance, high power, and small size in high-current detection scenarios. It adopts a standard 3920 chip package (size approximately 9.9mm × 5.0mm), balancing installation convenience and heat dissipation space. Compatible with automated mounting processes, it significantly improves circuit production efficiency.

In terms of core parameters, the nominal resistance of this 3920 0.005R 3W resistor is precisely set at 0.005R (5m Ohm), with a resistance accuracy strictly controlled at ±1%, ensuring signal accuracy during current sampling and avoiding circuit detection errors caused by resistance deviations. The rated power reaches 3W, which can stably bear the rated power at an ambient temperature of 70°C, meeting the power consumption requirements of high-current circuits. It also supports short-term overload conditions, adapting to dynamic power changes in complex circuits. In the model ESR39F3WR005K02G, "ESR" represents the surge-resistant series, "39" corresponds to the 3920 package, "F" indicates ±1% accuracy, "3W" is the rated power, and "R005" refers to 0.005R resistance. The core attributes of the product are clearly marked, facilitating model selection and identification.

The 3920 0.005R (5m Ohm) 3W 1% ESR39F3WR005K02G Metal Shunt Chip Resistor uses Karma material (Karma alloy) as the core material of the resistor body. This is a key advantage that distinguishes it from ordinary thick-film resistors and manganin alloy resistors, directly determining the core performance of low temperature drift, high precision, and strong aging resistance.

Karma alloy (nickel-chromium-aluminum-iron alloy) exhibits an extremely low resistance temperature coefficient (TCR). The temperature drift coefficient of this 3920 0.005R 3W resistor can be controlled within ±50ppm/°C, far superior to the ±200ppm/°C level of ordinary resistors. This means that in a wide operating temperature range of -55°C to +170°C, the resistance fluctuation is minimal, ensuring circuit stability under extreme high and low temperature conditions. It is perfectly suitable for scenarios such as new energy vehicle electronic control and industrial high-temperature power supplies. Meanwhile, Karma material boasts excellent chemical stability, outstanding oxidation and corrosion resistance. It is not prone to material aging or resistance drift during long-term operation, significantly extending product service life and reducing circuit maintenance costs. In addition, Karma material features excellent non-inductive characteristics, extremely low parasitic inductance, and fast response speed. It can be used for high-frequency AC current detection, adapting to sampling requirements of high-frequency circuits.

The low temperature drift performance of the 3920 0.005R (5m Ohm) 3W 1% ESR39F3WR005K02G Metal Shunt Chip Resistor is one of its core competitive advantages. Relying on the excellent temperature characteristics of Karma material and precision manufacturing technology, the resistance changes minimally in the operating temperature range of -55°C to +170°C, with the temperature drift coefficient stably controlled within ±50ppm/°C. Whether in outdoor energy storage equipment in cold environments or industrial motor controllers operating at high temperatures, this 3920 0.005R 3W resistor maintains stable resistance, avoiding circuit runaway or damage caused by current detection deviations due to temperature changes. It provides a continuously reliable sampling reference for circuits.

High precision is the core design goal of the 3920 0.005R 3W resistor, with resistance accuracy strictly controlled at ±1%. Combined with the ultra-low resistance of 0.005R, it enables precise sampling of high currents (according to Ohm's Law I=U/R, a tiny voltage signal can be converted into an accurate current value). In scenarios such as new energy battery management systems (BMS), industrial precision power supplies, and electric tool control boards, current sampling accuracy directly determines system control precision. With ±1% high precision, this resistor ensures accurate current data collection, providing a reliable basis for system overcurrent protection, power regulation, and power monitoring, avoiding system misoperation or damage caused by sampling errors.

The 3920 0.005R (5m Ohm) 3W 1% ESR39F3WR005K02G Metal Shunt Chip Resistor has strong surge resistance, which can effectively withstand transient inrush currents during circuit startup, surge currents from load mutations, and instantaneous high currents from short circuits. It prevents resistor burnout due to transient overload and improves circuit anti-interference capability and reliability. Its integrated alloy structure design ensures close integration between the resistor body and electrodes, enabling rapid heat dissipation of transient heat generated by surge currents. Meanwhile, the special surface passivation treatment enhances the resistor body's pulse resistance, ensuring stable long-term operation under frequent surge conditions and adapting to complex scenarios such as motor startup, power supply switching, and load short circuits.

Against the backdrop of the global green electronics industry, the 3920 0.005R (5m Ohm) 3W 1% ESR39F3WR005K02G Metal Shunt Chip Resistor strictly adheres to international environmental regulations and fully meets RoHS, REACH, and lead-free environmental protection requirements. It provides compliance guarantees for electronic product exports and green production.

• RoHS Compliance: The product strictly follows the EU Directive 2011/65/EU and its amendments. No harmful substances such as lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), and polybrominated diphenyl ethers (PBDE) are added during manufacturing. The content of harmful substances is far below the directive limits, enabling legal sales in regions with strict environmental regulations such as the EU and North America, avoiding export compliance risks.
• REACH Compliance: The product has passed testing by a third-party authoritative laboratory and completed full material information disclosure assessment as required by REACH regulations. It does not contain Substances of Very High Concern (SVHC) published by the European Chemicals Agency (ECHA), meeting EU requirements for chemical registration, evaluation, authorization, and restriction. It easily passes the strictest international chemical reviews.
• Lead-Free Environmental Protection: Adopting a completely lead-free manufacturing process, the electrode terminals are made of lead-free copper, and the resistor body is made of lead-free Karma alloy. It completely abandons traditional lead-containing processes, adapting to high-temperature lead-free reflow soldering production processes. It avoids problems suchs as brittle solder joints and poor soldering wetting, while reducing heavy metal pollution and conforming to the global green electronics manufacturing trend.

With the precise parameters of 3920 0.005R (5m Ohm) 3W 1%, excellent performance of Karma material, and RoHS/REACH/lead-free environmental compliance, this metal shunt chip resistor is widely used in the following core scenarios:

1. New Energy Vehicles: Current sampling in battery management systems (BMS), bus current detection in motor controllers, and circuit shunting in on-board chargers, adapting to high-temperature, vibration, and high-current working conditions.
2. Industrial Power Supplies and Energy Storage Equipment: Output current sampling of high-power switching power supplies, charge and discharge current monitoring of energy storage battery packs, and overload protection of UPS power supplies, ensuring stable operation of power supply systems.
3. Electric Tools and Motor Control: Current detection in brushless motor controllers, overload protection in electric wrenches/drills, and surge suppression during motor startup, adapting to frequent start-stop and load mutation scenarios.
4. Precision Electronic Equipment: Current sampling in industrial precision instruments, power circuits in medical equipment, and power supply systems in communication base stations, meeting requirements for high precision, low drift, and high reliability.
5. Green Electronic Manufacturing: Export-oriented electronic products, lead-free production equipment, and environmentally friendly industrial control boards, complying with global environmental regulations and supporting enterprises in green production.

The 3920 0.005R (5m Ohm) 3W 1% ESR39F3WR005K02G Metal Shunt Chip Resistor is an industrial-grade high-quality component integrating ultra-low resistance, high power, high precision, low temperature drift, strong surge resistance, and green environmental protection. The precise parameter design of 3920 0.005R 3W perfectly meets the needs of high-current sampling scenarios. Karma material lays the performance foundation for low temperature drift, high stability, and long service life. RoHS, REACH, and lead-free environmental compliance satisfy the global green electronics manufacturing trend. Strong surge resistance adapts to complex and harsh working conditions. Whether in new energy vehicles, industrial power supplies, electric tools, or precision electronic equipment, this resistor provides stable and reliable current sampling, circuit shunting, and overload protection functions. It is a preferred core component for high-current circuit design, escorting the accurate, stable, and safe operation of circuit systems.