9W Current Shunt Resistor 0.5m Ohm Low Ohm Resistors For Current Sensing

Product Specification

 ESR39F9W0M50M02G: 3920 0.0005Ω (0.5m Ohm) 9W 1% Metal Shunt Chip Resistor

 Introduction

The ESR39F9W0M50M02G is a highperformance metal shunt chip resistor designed for precision current sensing applications. This advanced component features a ultralow resistance value of 0.0005Ω (0.5m Ohm) with ±1% tolerance and can handle up to 9W of power dissipation. Packaged in a compact 3920 case size, this resistor demonstrates excellent performance characteristics including strong surge resistance, low inductance, and manganesecopper (MnCu) composition. The product fully complies with RoHS, REACH, and leadfree environmental requirements, making it suitable for various electronic applications where precision, reliability, and environmental compliance are critical.

 Technical Specifications

The ESR39F9W0M50M02G resistor boasts impressive technical specifications that make it stand out in the crowded field of current sensing components. The 3920 package size measures approximately 10.00mm × 5.20mm (0.394" × 0.205"), providing sufficient surface area for effective heat dissipation while maintaining a compact footprint on printed circuit boards . With a 0.0005Ω (0.5m Ohm) resistance value, this component offers minimal voltage drop in current sensing applications, thereby improving overall system efficiency.

The 9W power rating represents the maximum continuous power the resistor can dissipate under specified operating conditions, making it suitable for highcurrent applications . The ±1% resistance tolerance ensures measurement accuracy in precision applications. The resistor operates within a wide temperature range of 55°C to +170°C, maintaining stable performance across various environmental conditions .

The temperature coefficient of ±100ppm/°C guarantees minimal resistance variation with temperature fluctuations . This low TCR is particularly important in applications where temperature variations are significant, as it ensures consistent performance regardless of operating conditions.

 Construction and Material Advantages

The MnCu (manganesecopper) material used in the ESR39F9W0M50M02G resistor provides several distinct advantages. MnCu alloy offers excellent electrical conductivity combined with minimal thermoelectric effect, which is crucial for precision current measurement. The material exhibits superior stability over time and temperature cycles, ensuring longterm reliability of the measurement system.

The construction technique employed in this metal shunt chip resistor contributes to its low inductance characteristic, which is typically less than 2nH . This low inductance is vital for maintaining accuracy in highfrequency applications, where inductive reactance could otherwise significantly affect measurement precision. The low inductance also makes the resistor suitable for switching power supply applications where fast transient response is required.

The component's strong surge resistance capability allows it to withstand sudden current spikes without permanent damage or significant parameter shifts. This robustness makes it ideal for applications prone to unexpected current surges, such as motor control systems, power supply units, and automotive electronics.

 Environmental Compliance and Certifications

The ESR39F9W0M50M02G resistor complies with major international environmental standards, including RoHS (Restriction of Hazardous Substances) and REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations. This compliance ensures that the component does not contain hazardous substances above permitted limits, making it environmentally friendly throughout its lifecycle .

The leadfree construction aligns with global environmental initiatives and manufacturing requirements. The component is suitable for use in products destined for markets with strict environmental regulations, including the European Union, North America, and AsiaPacific regions.

While the search results don't explicitly state AECQ200 certification for the ESR39F9W0M50M02G specifically, similar components in the same category often carry this qualification , suggesting robustness for automotive applications, though verification with the manufacturer is recommended.

 Applications and Use Cases

The unique combination of features makes the ESR39F9W0M50M02G 3920 0.0005Ω (0.5m Ohm) 9W resistor ideal for various applications:

 Power supply units (PSU): Provides accurate current monitoring and overload protection in switching power supplies .

 Motor drive systems: Enables precise current feedback in motor control applications, improving efficiency and protection.

 Battery monitoring systems: Facilitates accurate charge/discharge current measurement in battery management systems .

 Industrial automation: Offers reliable current sensing in process control equipment and industrial machinery .

 Automotive electronics: Suitable for current measurement in automotive systems due to its robust construction and temperature stability.

 Power hybrids: Provides accurate current sensing in hybrid power systems .

 Performance Advantages

The ESR39F9W0M50M02G offers several performance advantages over conventional current sensing solutions. The low resistance value of 0.0005Ω (0.5m Ohm) minimizes power loss and heat generation during operation, improving overall system efficiency. The 9W power rating allows it to handle significant current levels while maintaining measurement accuracy.

The component's low inductance design ensures accurate current measurement even in highfrequency applications, making it suitable for modern switching power supplies and motor drives. The excellent longterm stability guarantees consistent performance over the product's lifetime, reducing calibration requirements and maintenance costs.

The strong surge resistance provides system robustness against unexpected current transients, enhancing reliability in demanding applications. The MnCu material offers optimal balance between electrical performance, thermal characteristics, and mechanical properties.

 Comparison with Alternative Solutions

When compared to other current sensing technologies, the ESR39F9W0M50M02G 3920 0.0005Ω (0.5m Ohm) 9W resistor provides a balanced combination of performance, size, and cost. Traditional current sensing resistors with similar specifications often come in larger packages or offer inferior performance characteristics.

Competitive products from manufacturers like Eaton (CHSA3920R0005F) and TT Electronics (LRMAP3920) offer similar resistance values and power ratings , but the ESR39F9W0M50M02G distinguishes itself with its specific material composition and optimized design for surge resistance and low inductance.

 Conclusion

The ESR39F9W0M50M02G 3920 0.0005Ω (0.5m Ohm) 9W 1% metal shunt chip resistor represents an advanced current sensing solution that combines precision, power handling capability, and environmental compliance. Its MnCu construction, low inductance, and strong surge resistance make it particularly suitable for demanding applications across various industries. With RoHS, REACH, and leadfree compliance, this component aligns with modern environmental standards while delivering reliable performance in critical current measurement applications. Whether used in power supplies, motor drives, battery management, or industrial systems, this resistor offers engineers a robust and accurate solution for their current sensing requirements.