ESR39F9W0M40M02G: 3920 0.0004Ω(0.4m Ohm) 9W Metal Shunt Chip Resistor

Product Overview

The ESR39F9W0M40M02G is a highperformance, lowresistance metal shunt chip resistor designed for precision current sensing applications. With its ultralow resistance value of 0.0004Ω(0.4mΩ) and high power rating of 9W, this component represents an optimal solution for power electronics requiring accurate current measurement and minimal power dissipation. Manufactured using MnCu (manganesecopper) material, this resistor exhibits excellent electrical characteristics including low temperature coefficient and minimal parasitic inductance.

This 3920 package size resistor meets stringent environmental requirements, complying with Rohs, Reach, and leadfree environmental standards. The device's robust construction ensures strong surge immunity and reliable performance under demanding operating conditions, making it particularly suitable for automotive, industrial, and power management applications where reliability and precision are paramount.

Technical Specifications

The ESR39F9W0M40M02G boasts impressive technical specifications that make it stand out in the crowded field of current sense resistors:

Resistance Value: 0.0004Ω (0.4mΩ) with ±1% tolerance

Power Rating: 9W at 70°C

Package Size: 3920 dimensions

Temperature Coefficient: ±100PPM/°C

Material Composition: MnCu (manganesecopper alloy)

Environmental Compliance: RoHS, REACH, and leadfree

Longterm Stability: Excellent performance over time

Low Inductance: <2nH typical

Operating Temperature Range: 55°C to +170°C

The 9W power rating of this 0.0004Ω resistor in the compact 3920 package represents an impressive power density achievement in current sensing technology. This high power capability allows the resistor to handle substantial current levels while maintaining accurate measurement characteristics.

Advanced Features and Benefits

Superior Surge Immunity

The ESR39F9W0M40M02G is engineered with exceptional surge withstand capability, a critical feature for applications experiencing current transients or sudden power spikes. The MnCu alloy construction provides inherent thermal stability that enables the resistor to dissipate surge energy effectively without degradation of electrical characteristics or physical damage.

UltraLow Inductance Design

With inductance specifications typically below 2nH, this current sense resistor minimizes parasitic effects that could compromise measurement accuracy in highfrequency applications. The low inductance is achieved through optimized material selection and manufacturing techniques, ensuring precise current measurement even in fastswitching circuits.

Precision Performance

The ±1% resistance tolerance guarantees accurate current sensing across the entire operating temperature range. The combination of tight tolerance and low TCR (±100PPM/°C) ensures consistent performance regardless of environmental conditions, making the ESR39F9W0M40M02G particularly valuable for precision applications requiring longterm stability.

MnCu Material Advantages

The manganesecopper (MnCu) alloy construction provides an optimal balance of electrical and thermal properties. This material offers low resistivity, excellent temperature stability, minimal thermal EMF, and superior longterm stability compared to alternative materials. The MnCu composition contributes directly to the resistor's robust surge performance and reliable operation under continuous load conditions.

Applications

The ESR39F9W0M40M02G is ideally suited for various applications requiring precise current monitoring:

Power Supply Units: Current limiting and monitoring in switchmode power supplies

Motor Drive Systems: Precision current sensing in motor control circuits

Battery Management Systems: Charge/discharge current monitoring in automotive and industrial battery packs

Solar Power Inverters: Current feedback for maximum power point tracking

Welding Equipment: Highcurrent measurement in industrial welding systems

Uninterruptible Power Supplies: Output current monitoring and protection

Automotive Electronics: EV/HEV powertrain current monitoring and battery management

The 9W power capability of this 0.0004Ω resistor makes it especially suitable for highcurrent applications where conventional current sensing methods would introduce excessive power loss or measurement inaccuracies.

Comparative Advantage

When compared to similar current sense resistors in the 3920 package category, the ESR39F9W0M40M02G offers a compelling combination of features. While many competing products typically offer lower power ratings (often 3W5W in similar packages), this device delivers a robust 9W capability, representing a significant advantage in power density.

The MnCu material construction provides superior performance characteristics compared to alternative materials like FeCrAl or Karma alloys, particularly in terms of temperature stability and low parasitic inductance. This makes the ESR39F9W0M40M02G an optimal choice for applications demanding both precision and reliability.

Environmental Compliance and Reliability

The ESR39F9W0M40M02G fully complies with international environmental standards including RoHS and REACH, ensuring the device is free from hazardous substances and meets global environmental requirements. The leadfree construction makes it suitable for use in products marketed worldwide without regulatory restrictions.

The device's robust construction and quality materials contribute to exceptional longterm reliability, even under continuous operation at elevated temperatures. This reliability is particularly valuable in automotive, industrial, and infrastructure applications where component failure could result in system downtime or safety concerns.

Conclusion

The ESR39F9W0M40M02G 3920 package current sense resistor represents an optimal solution for applications requiring precise current measurement with minimal power loss. With its 0.0004Ω resistance, 9W power handling capability, and MnCu material construction, this device delivers outstanding performance in a compact form factor. The combination of high precision, excellent surge immunity, low inductance, and full environmental compliance makes this resistor an excellent choice for designers working on nextgeneration power electronics across automotive, industrial, and consumer applications.

For engineers seeking a reliable, highperformance current sensing solution, the ESR39F9W0M40M02G offers the ideal balance of electrical characteristics, power handling capability, and physical robustness in the popular 3920 package size.