The **LOR3E-R01-D** is a specialized electronic component, typically identified as a **high-precision, low-resistance current sense resistor** or a specific **shunt module** used in power management systems. It is designed to monitor current flow by measuring the voltage drop across its resistive element. --- ### 1. Key Technical Specifications Below are the typical parameters associated with this class of electronic part: | Parameter | Description | Typical Value | | :--- | :--- | :--- | | **Resistance Value** | The primary ohmic value | Often 0.1mΩ to 1mΩ (depending on specific R-code) | | **Power Rating** | Maximum wattage it can dissipate | 3W to 5W | | **Tolerance** | Accuracy of the resistance | ±1% or ±0.5% | | **Temperature Coefficient (TCR)** | Resistance stability over temperature | ±50ppm/°C to ±75ppm/°C | | **Package Style** | Physical dimensions/Mounting | SMD (Surface Mount) or Open Frame | --- ### 2. Functional Breakdown The "LOR" series (often associated with manufacturers like *LIZ Electronics* or *Isabellenhütte* style shunts) focuses on several critical electronic properties: #### A. Manganin/Metal Alloy Element The core of the part is usually a electron-beam welded metal alloy. This material is chosen because its resistance does not change significantly as it heats up, ensuring accurate readings even at high currents. #### B. Kelvin Connection (4-Terminal) Though some variants are 2-terminal, high-precision versions like this often utilize or are designed for **Kelvin sensing**. This separates the "Current Path" from the "Voltage Sense Path" to eliminate the resistance of the solder joints from the measurement. #### C. Low Inductance Because these parts are used in switching power supplies, they are designed with very low parasitic inductance (typically <3nH). This prevents voltage spikes during high-frequency switching. --- ### 3. Application Use-Cases In an electronic circuit, the LOR3E-R01-D is generally found in: 1. **Battery Management Systems (BMS):** Monitoring charge and discharge cycles in Li-ion packs. 2. **Motor Control:** Providing feedback to the MCU regarding motor torque and load. 3. **DC-DC Converters:** Acting as the feedback element for overcurrent protection (OCP). --- ### 4. Part Number Decoder (Typical) While naming conventions vary by manufacturer, the code usually breaks down as follows: * **LOR:** Series (Low Ohmic Resistor). * **3E:** Power Rating (e.g., 3 Watts). * **R01:** Resistance value (e.g., 0.01 Ohms or 10mΩ). * **D:** Tolerance (D is often used for ±0.5%).