ESR59F7WR003K02G metal shunt chip resistor: high-precision, low-temperature drift current detection solution
ESR59F7WR003K02G metal shunt chip resistor, as a core component designed for high-precision current sampling, has demonstrated excellent application value in industrial control, new energy vehicles, power management and other fields with its excellent electrical performance and reliable material technology. This article will provide an in-depth introduction to this precision resistor product with a 5930 package, 0.003R (0.003 Ohm) resistance, and 7W power.
ESR59F7WR003K02G metal shunt chip resistor: high-precision, low-temperature drift current detection solution
Accurate current detection is crucial for system stability, energy efficiency management, and safety protection in modern electronic devices. ESR59F7WR003K02G metal shunt chip resistor, as a core component designed for high-precision current sampling, has demonstrated excellent application value in industrial control, new energy vehicles, power management and other fields with its excellent electrical performance and reliable material technology. This article will provide an in-depth introduction to this precision resistor product with a 5930 package, 0.003R (0.003 Ohm) resistance, and 7W power.
1、 Product Overview and Basic Parameters
ESR59F7WR003K02G is a low resistance shunt from the ESR series under the Ellon brand, with a standard 5930 package size (15.00mm × 7.75mm × 1.60mm). Its core electrical parameters include a nominal resistance of 0.003 Ω (i.e. 3 milliohms), a resistance accuracy of ± 1%, and a rated power of 7W. The working temperature range of this resistor is wide, and it can operate stably in an environment from -55 ℃ to+175 ℃. The inductance value is less than 2nH, and the thermoelectric potential (EMV) is less than 1 µ V/℃ in the range of 0-100 ℃. These basic parameters ensure its measurement accuracy and long-term reliability under harsh working conditions.
2、 Core technical features and performance advantages
High precision and low-temperature drift characteristics: The resistance tolerance of ESR59F7WR003K02G is strictly controlled within ± 1%, and with a temperature coefficient of only ± 75PPM/℃, the resistance fluctuation is minimal when the temperature changes. This low-temperature drift characteristic is particularly important for applications such as automotive electronics and outdoor equipment that require wide temperature range operation, and can effectively avoid measurement errors caused by environmental temperature changes.
Strong surge resistance: As a metal shunt resistor, this product adopts special alloy materials and structural design, which can withstand short-term overcurrent and surge impact. Its 7W rated power is at a relatively high level in the 5930 package, providing sufficient power margin for continuous high current sampling.
Excellent long-term stability: Karma alloy is used as the resistance material, which has excellent oxidation and corrosion resistance, and can maintain long-term stability of resistance even in high temperature and high humidity environments. According to test data, after long-term thermal aging (such as 100 ℃/1000 hours), the resistance change rate can be controlled at a level of ≤ 0.1%.
3、 Depth analysis of Karma material
Karma alloy (grade 6J22 or 6J23) is a nickel chromium aluminum iron precision resistance alloy, whose chemical composition mainly includes nickel (balance), chromium (19% -21%), aluminum (2.5% -3.2%), iron (2.0% -3.0%) and other elements. This material has multiple outstanding characteristics:
High resistivity: about 1.33 μ Ω· m, which is 2-3 times that of ordinary manganese copper alloy, and can achieve lower resistance design within a limited volume.
Extremely low temperature coefficient of resistance: The typical value is ± 20 × 10 ⁻⁶/℃, and some high-precision products can be controlled within ± 10 × 10 ⁻⁶/℃ to ensure measurement consistency over a wide temperature range.
Low thermoelectric potential: The thermoelectric potential of copper is ≤ 1.5 μ V/℃, reducing the impact of thermoelectric effects on measurement accuracy.
Good mechanical properties: tensile strength can reach 950-1400MPa (hard state), elongation ≥ 25% (annealed state), suitable for precision machining and welding processes.
These material properties make Karma alloy an ideal choice for high-precision and high stability resistive components, particularly suitable for automotive electronics, industrial control, and precision instrument fields that require long-term reliable operation.
4、 Application Fields
ESR59F7WR003K02G 5930 0.003R 7W metal shunt resistor is widely used in:
Battery Management System (BMS): Used for current monitoring and protection of electric vehicles and energy storage systems
Motor drive control: current feedback and overcurrent protection for servo motors and stepper motors
Power module: Output current detection for switch mode power supply and DC-DC converter
Industrial Automation: Current Sampling for PLC, Inverter, and Robot Control Systems
New energy field: power monitoring of photovoltaic inverters and wind power converters
5、 Environmental certification and quality standards
This product fully complies with international environmental standards, including RoHS (Restriction of Hazardous Substances Directive) and REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) regulations, ensuring the absence of harmful substances such as lead, mercury, cadmium, etc. At the same time, the product adopts lead-free soldering technology to meet the strict environmental requirements of modern electronic manufacturing. The manufacturer provides a complete specification sheet (ESR-Rve2510. pdf) and certification report to facilitate compliance review and product validation for customers.
VI. Summary
The ESR59F7WR003K02G metal shunt chip resistor, with its 5930 package, 0.003R (0.003 Ohm) resistance value, and 7W power specification combination, combined with the excellent characteristics of Karma alloy material, provides a reliable solution for high-precision current detection. Its ± 1% accuracy, ± 75PPM temperature coefficient, strong surge resistance, and comprehensive environmental certification make it perform well in demanding industrial, automotive, and new energy applications. Whether for system design engineers or procurement personnel, this 5930 0.003R 7W resistor is worth considering as one of the preferred components for current sampling circuits.
With the continuous improvement of energy efficiency and safety requirements for electronic devices, 5930 0.003R 7W metal shunt resistors with high precision, low temperature drift, and high reliability, such as ESR59F7WR003K02G, will play a key role in more fields, providing solid guarantees for the precise measurement and protection functions of intelligent control systems.