The **LOR3-R005-D** is a specialized electronic component, specifically a **high-precision, high-power current sensing resistor**. It is part of the LOR series, designed to measure current by monitoring the voltage drop across a known resistance value. --- ### 1. Technical Specifications The following table outlines the primary electrical and mechanical characteristics of the LOR3-R005-D: | Parameter | Value / Specification | Details | | :--- | :--- | :--- | | **Resistance Value** | 0.005 Ω (5 mΩ) | Ultra-low resistance to minimize power loss. | | **Power Rating** | 3 Watts | Ability to dissipate heat at high currents. | | **Tolerance** | ±0.5% (D) | High precision for accurate current measurement. | | **Temperature Coefficient** | ±50 ppm/°C | Stability across varying temperature ranges. | | **Construction** | Metal Element | Open-air style or molded metal for heat dissipation. | | **Mounting Type** | Through-hole | Radial leads designed for PCB mounting. | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying its function: * **LOR**: Series name (Low Ohmic Resistor / Current Sense). * **3**: Power rating (3 Watts). * **R005**: Resistance value (0.005 Ohms). * **D**: Tolerance code (±0.5%). --- ### 3. Key Features & Applications This component is engineered for performance in power electronics where accuracy and thermal stability are critical. #### Key Features: * **Flameproof Construction:** Designed to fail safely under extreme overload conditions. * **Low Inductance:** The metal element design reduces parasitic inductance, making it suitable for high-frequency switching. * **High Stability:** The low TCR (Temperature Coefficient of Resistance) ensures the resistance doesn't drift as the part heats up. #### Common Applications: 1. **Battery Management Systems (BMS):** Monitoring charge/discharge cycles. 2. **Motor Control:** Sensing phase currents to regulate speed and torque. 3. **Power Supplies:** Implementing over-current protection and feedback loops. 4. **DC-DC Converters:** Managing energy efficiency and load balancing. --- ### 4. Typical Connection Diagram In a standard circuit, the resistor is placed in series with the load. The voltage ($V$) measured across the pins allows a microcontroller to calculate current ($I$) using Ohm's Law: $I = V / R$. ```markdown [Input Voltage] | +----|----+ | Load | +----|----+ | [LOR3-R005-D] <-- Voltage measured across this point | Ground ```