The **LOR3-R010-D** is a high-precision, low-resistance current sense resistor. These components are specifically designed to monitor current flow in electronic circuits by measuring the small voltage drop across the resistor. ### Technical Specifications Below are the primary electrical and physical characteristics of the LOR3-R010-D: | Parameter | Specification | | :--- | :--- | | **Resistance Value** | 0.010 Ω (10 mΩ) | | **Power Rating** | 3 Watts | | **Tolerance** | ±0.5% (D-Grade) | | **Temperature Coefficient (TCR)** | Typically ±50 ppm/°C or lower | | **Package Type** | Radial Lead (Through-Hole) | | **Material** | Open-air metal element | --- ### Key Features and Construction 1. **Metal Element Design**: Unlike standard film resistors, the LOR series uses a solid metal alloy element. This allows the part to handle high current surges and maintain stability without the risk of "burning out" like carbon-based components. 2. **Low Inductance**: The "open-air" construction results in very low self-inductance. This is critical for high-frequency switching applications like Power Factor Correction (PFC) or DC-DC converters. 3. **High Precision**: The "D" suffix indicates a **±0.5% tolerance**, which is high precision for a power resistor. This ensures that the current measurement is accurate across varying temperatures. 4. **Heat Dissipation**: The radial leads are designed to lift the resistive element off the PCB, allowing air to circulate around it and preventing heat damage to the circuit board. ### Common Applications * **Battery Management Systems (BMS)**: Monitoring charge and discharge cycles in lithium-ion packs. * **Motor Control**: Providing feedback loops for speed and torque regulation. * **Power Supplies**: Over-current protection and voltage regulation. * **Automotive Electronics**: Sensing current for auxiliary systems. --- ### Typical Circuit Implementation In a standard circuit, the resistor is placed in series with the load. The voltage ($V$) is measured across the resistor's terminals: ```python # Ohms Law Calculation for this part Resistance = 0.010 # Ohms Max_Power = 3.0 # Watts # Calculating Max Continuous Current (I = sqrt(P/R)) Max_Current = (Max_Power / Resistance) ** 0.5 print(f"Maximum Continuous Current: {Max_Current} Amperes") ```