Ellon Brand ESR25F5WR005K04S 2512 0.005R(5m Ohm) 5W 1% Shunt Chip Resistor Product Introduction

Ellon Brand ESR25F5WR005K04S 2512 0.005R(5m Ohm) 5W 1% Shunt Chip Resistor Product Introduction

1. Product Overview

In the field of precision current sensing and high-power shunt applications, the Ellon ESR25F5WR005K04S resistor has become a preferred choice for many engineers due to its outstanding performance and reliability. This product is a typical 2512 0.005R(5m Ohm) 5W shunt chip resistor, featuring a standard 2512 package (6.35mm×3.2mm), resistance value of 0.005 ohm (5 milliohms), rated power of 5 watts, and tolerance of ±1%. This 2512 0.005R(5m Ohm) 5W resistor is specially designed for circuits requiring high-accuracy current sampling, capable of long-term stable operation in harsh industrial environments.

2. Core Material and Process Advantages

The core strength of the Ellon ESR25F5WR005K04S lies in its Karma alloy resistive element. Karma alloy is a precision nickel-chromium-aluminum-iron-copper resistance alloy with excellent temperature coefficient of resistance (TCR) and long-term stability. Compared with traditional thick-film or thin-film resistors, the Karma material enables this 2512 0.005R(5m Ohm) 5W resistor to achieve extremely low temperature drift – typically below ±50ppm/℃. This means that within the operating temperature range of -55℃ to +155℃, the resistance value changes minimally, making it ideal for precision measurement applications sensitive to temperature.

Furthermore, the high tensile strength and oxidation resistance of Karma alloy give this 2512 0.005R(5m Ohm) 5W resistor excellent surge immunity. When overvoltage or surge current occurs suddenly in the circuit, the resistor body does not burn out instantly or experience sudden resistance shifts, effectively protecting the downstream sampling circuit. Additionally, this material provides low thermoelectric EMF, further reducing measurement errors.

3. Environmental Compliance and Safety Standards

Ellon consistently adheres to green manufacturing principles. The ESR25F5WR005K04S resistor strictly complies with:

• RoHS: Free from lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE.

• REACH: All raw materials pass SVHC screening, meeting EU regulations on chemical registration, evaluation, authorization, and restriction.

• Lead-free environmental protection: The terminations are plated with lead-free process, ensuring solderability while avoiding lead contamination.

Thus, this 2512 0.005R(5m Ohm) 5W resistor can be exported freely to the EU, North America, and other regions with strict environmental regulations, helping customers’ end products pass relevant certifications.

4. Detailed Technical Specifications

For a 2512 0.005R(5m Ohm) 5W specification, 5W power in a 2512 package represents a high-power level, thanks to Ellon’s optimized integrated precision alloy structure and thick copper electrode design, which provides far better heat dissipation than ordinary chip resistors.

5. Key Applications

Due to its combination of low resistance, high power, high accuracy, low TCR, and surge immunity, this 2512 0.005R(5m Ohm) 5W resistor is widely used in:

1. Switching power supply current sensing: As a current-sense resistor in DC-DC converters and AC-DC adapters, converting current signals into voltage for PWM controllers. The 5mΩ ultra-low resistance minimizes conduction losses and improves efficiency.

2. Battery management systems (BMS): For charge/discharge protection boards in lithium battery packs, monitoring charging/discharging currents to implement overcurrent and short-circuit protection. The 5W power rating withstands high current surges from power batteries.

3. Motor drives & inverters: Sensing phase currents in servo drives, stepper motor drives, and inverter air conditioners, working with op-amps for closed-loop control. Surge immunity ensures the resistor survives motor start/stop transients.

4. Automotive electronics: Such as onboard chargers (OBC), DC-Link capacitor pre-charge circuits, and battery pack current sampling. Meets AEC-Q200 standards (specific grade to be confirmed).

5. Instruments & test equipment: As a precision shunt for internal current range extension in digital multimeters, power analyzers, electronic loads, etc.

6. Comparison with Similar Products

Ordinary 2512 chip resistors typically offer only 1W~2W power, with thick-film technology exhibiting high TCR (±200~±400ppm/℃) and low accuracy (±5%). In contrast, the Ellon 2512 0.005R(5m Ohm) 5W resistor, manufactured using metal alloy plate etching, achieves:

• Higher power density: 3~5 times more power in the same footprint.

• Long-term stability: Annual drift <0.5% thanks to Karma alloy, vs. 2%~5% for thick-film.

• Superior surge rating: Passes 8/20μs waveform, 5kV surge test, suitable for outdoor and industrial harsh grid environments.

7. Ordering and Marking Information

The full model ESR25F5WR005K04S decoding:

• ESR25F: Ellon series, 25=2512 package, F=±1% tolerance

• 5W: Rated power 5W

• R005: Resistance 0.005Ω (R denotes decimal point)

• K: Karma material

• 04S: Version or packaging code (tape & reel, 4000 pcs per reel)

This product is supplied in tape-and-reel packaging for SMT automatic placement, with reflow soldering peak temperature up to 260℃.

8. Conclusion

The Ellon ESR25F5WR005K04S 2512 0.005R(5m Ohm) 5W shunt chip resistor integrates Karma precision alloy, 5W high power capacity, ±1% accuracy, low TCR of ±50ppm/℃, and excellent surge immunity, while fully complying with RoHS, REACH, and lead-free environmental requirements. Whether used in consumer electronics power management, industrial equipment current sensing, or harsh automotive environments, this resistor delivers stable and reliable performance. If you are looking for a high-performance 5 milliohm shunt resistor, the Ellon 2512 0.005R(5m Ohm) 5W product is a trustworthy choice.