The part number **LOR3E-R005-J** refers to a high-precision, low-resistance shunt resistor typically used for current sensing applications. Below is a detailed breakdown of its specifications and electronic characteristics. ### 1. Part Number Breakdown To understand the component, we can decompose the nomenclature: | Component Segment | Description | Meaning | |:---|:---|:---| | **LOR** | Series Code | Open-air metal element resistor (Shunt) | | **3E** | Power Rating | Approximately 3 Watts (Size/Power category) | | **R005** | Resistance Value | 0.005 Ohms (or 5 mΩ) | | **J** | Tolerance | ±5% | --- ### 2. Technical Specifications These resistors are designed to handle significant current while maintaining stability. * **Resistance:** 5 mΩ (Milliohms). * **Power Rating:** 3 Watts (at rated temperature). * **Tolerance:** ±5% (indicated by the 'J'). * **Construction:** Metal element (usually a copper-nickel or manganese alloy) with a flameproof coating or open-air design to dissipate heat. * **Temperature Coefficient (TCR):** Typically low (e.g., ±50ppm/°C to ±100ppm/°C) to ensure accuracy across temperature swings. --- ### 3. Key Electronic Functions The LOR3E-R005-J is primarily used as a **Current Sense Resistor**. Here is how it functions in a circuit: #### Current-to-Voltage Conversion According to Ohm’s Law ($V = I \times R$), when current flows through this 0.005Ω resistor, it creates a very small proportional voltage drop. * **Example:** If 10 Amps flow through the resistor: * $V = 10A \times 0.005\Omega = 0.05V$ (or 50mV). * An integrated circuit (IC) or microcontroller then measures this 50mV to calculate the exact current being drawn by the system. #### Thermal Management Because it is a "3E" (3W) rated part, it is built to withstand heat generated by continuous high-current flow. The "LOR" series often features a "pedestal" or "radial" lead design that keeps the hot resistive element away from the PCB surface to prevent board damage. --- ### 4. Typical Applications * **Power Supplies:** Monitoring output current to prevent over-current conditions. * **Battery Management Systems (BMS):** Tracking charge and discharge cycles in Lithium batteries. * **Motor Control:** Sensing motor load to adjust torque or speed. * **Automotive Electronics:** Power distribution and safety systems. ---