1225 0.002R (2mR) 3W 1% ± 50ppm/℃ current sensing resistor comprehensive introduction
1225 0.002R (2mR) 3W 1% current sensing resistor recommended: Walter-HTE-M series
>In the world of precision electronics, the precise measurement of small currents cannot be separated from a seemingly simple yet highly technical component - the current sensing resistor.
In the modern electronics industry, especially in the fields of high power density and precision control, current detection is a crucial technology. The 1225 0.002R (2mR) 3W 1% ± 50ppm/℃ current sensing resistor is an advanced passive component designed to meet such demanding applications.
This resistor, with its extremely low resistance value, high power tolerance, and excellent temperature stability, has become a key component in high-precision current measurement applications, providing a solid foundation for the safe, efficient, and reliable operation of electronic systems.
01 Product Overview and Key Technical Parameters
The 1225 0.002R (2mR) 3W metal foil chip resistor is a surface mount resistor made of precision metal foil material. ”1225 "represents a package size of 12.2mm × 5.2mm, which helps with better heat dissipation and supports higher power consumption.
Its nominal resistance is 0.002 Ω (i.e. 2m Ω), which makes it very suitable for high current detection and power management circuits due to its extremely low resistance. The rated power is 3W, indicating that the resistor can withstand relatively high power levels and is suitable for high power density designs.
The accuracy of this resistor reaches ± 1%, indicating that its resistance deviation is controlled within a very narrow range, which is suitable for application scenarios that require high consistency of circuit parameters. The temperature coefficient is ± 50ppm/℃, which means that the change in resistance value is very small when the temperature changes.
02 Core Features and Advantages
The 1225 0.002R (2mR) 3W current sensing resistor has multiple outstanding characteristics, making it an ideal choice in many application scenarios.
High current carrying capacity: Due to its extremely low resistance value (only 2m Ω), this resistor can withstand large currents in the circuit with minimal voltage drop and heat generation. This makes it highly suitable for applications that require high current sampling and control, such as power systems, motor drives, inverters, and battery management.
Excellent temperature stability: This resistor has an extremely low temperature coefficient (TCR), typically as low as ± 5 ppm/° C or even lower. This means that the resistance change of 1225 0.002R (2mR) 3W is minimal over a wide temperature range, ensuring the stability and reliability of the circuit under different environmental conditions.
Low inductance design: Using special structural design and manufacturing processes, this resistor has extremely low parasitic inductance. This feature is particularly important in high-frequency switching circuits, high-speed digital systems, and RF applications, as it can effectively reduce oscillations and noise caused by inductance and improve overall system performance.
High reliability and long lifespan: Metal foil resistors themselves have excellent long-term stability, impact resistance, and vibration resistance. The 1225 0.002R (2mR) 3W product has undergone rigorous aging and environmental testing, and can maintain its performance under harsh conditions, extending the service life of the equipment.
Environmental compliance: The product fully complies with Rohs (Restriction of Hazardous Substances Directive) and Reach (Registration, Evaluation, Licensing, and Restriction of Chemicals) regulations, and is manufactured using lead-free processes to meet the global market demand for environmentally friendly electronic components.
03 Application Fields
1225 0.002R (2mR) 3W current sensing resistor is widely used in high-precision and high reliability electronic systems.
In the power management module, it is used for current detection, overcurrent protection, and feedback control. Combined with an analog-to-digital converter (ADC), the voltage drop across the resistor (V=I × R) can be converted into a digital signal, providing real-time data for the power management system.
In the field of industrial automation and motor drive, this resistor achieves precise current monitoring in frequency converters and servo drives. In the motor control system, real-time adjustment of motor torque and speed is achieved by detecting the motor drive current.
New energy vehicles and charging facilities are important application areas for 1225 0.002R (2mR) 3W resistors. In the battery management system (BMS), it can monitor the charging and discharging currents of the battery in real time, control the working status of the battery through precise data, and ensure that the battery operates within a safe range.
In communication infrastructure, such as base station power supply, server power supply and other situations that require high-performance resistors, this resistor plays an important role. Its low inductance characteristic is particularly suitable for application in high-frequency switching power supplies, which can quickly respond to current changes without introducing excessive noise or distortion.
There is also an urgent demand for 1225 0.002R (2mR) 3W resistors in the medical and aerospace electronics fields, as these fields have extremely high requirements for component stability and reliability. Its excellent temperature coefficient and stability enable it to continue working in harsh environments, protecting the safety of equipment and operators.
04 Technical Design and Innovation
The 1225 0.002R (2mR) 3W current sensing resistor adopts metal foil technology and uses special alloy foil material to form precise resistance patterns through photolithography process. This process ensures extremely high precision and stability in the resistance value.
The wide electrode design is a prominent feature of this resistor. Compared to traditional resistors with small electrodes at both ends, a wide electrode means that the metalized contact area at both ends of the resistor is greatly increased. This design brings multiple key advantages:
Extremely low contact resistance and excellent heat dissipation performance. The large-area electrodes provide a better thermal conduction path to the printed circuit board (PCB), allowing heat to be efficiently transferred to the copper foil of the PCB through the electrodes and dissipated, thereby significantly reducing the temperature rise of the resistor body when subjected to high currents.
Excellent mechanical strength and welding reliability. A larger pad area means stronger adhesion, which can better withstand the thermal and mechanical stresses encountered by the circuit board during processing, transportation, and use, effectively preventing virtual soldering, cracking, and even detachment, greatly improving the long-term durability of the product.
Beneficial for the passage of high current. The wide electrode reduces the current density when current flows into and out of the resistor, reduces the risk of local overheating, and enables it to stably carry larger instantaneous or continuous currents.
05 Market Value and Prospects
Driven by energy-saving and emission reduction policies, the demand for high-precision and low-power electronic components continues to grow. The 1225 0.002R (2mR) 3W current sensing resistor has broad application prospects in emerging markets such as photovoltaic inverters, wind energy converters, and electric vehicle charging piles due to its environmental certification advantages, excellent electrical performance, and high reliability.
With the booming development of the Internet of Things and smart devices, the demand for current monitoring is also constantly increasing. In the future, 1225 0.002R (2mR) 3W and its subsequent products may play an important role in a wider range of fields, such as new consumer electronics products such as drones and smart wearables.
Innovation and technological progress will drive the continuous evolution of 1225 0.002R (2mR) 3W current sensing resistors, providing higher performance guarantees for various applications. At the same time, manufacturers will also increase their efforts in improving the reliability and stability of their products to meet the growing market demand.
1225 0.002R (2mR) 3W 1% ± 50ppm/℃ current sensing resistor is an ideal choice for precision current detection applications due to its extremely low resistance value, excellent temperature stability, and high power processing capability.
Its wide electrode design and alloy material construction ensure excellent heat dissipation performance and mechanical reliability, enabling it to operate stably in harsh environments.
As electronic devices move towards higher efficiency and smaller sizes, this 1225 0.002R resistor will continue to play a critical role in power management, automotive electronics, and industrial systems, providing solid support for technological progress.