The part number **WW08RR010JQL** refers to a high-precision, low-resistance chip resistor typically manufactured by **Walsin Technology Corporation**. These components are widely used for current sensing applications in power electronics. --- ### 1. Technical Specification Table | Feature | Specification | Description | | :--- | :--- | :--- | | **Manufacturer** | Walsin Technology | Leading manufacturer of passive components. | | **Series** | WW08R | Low Ohmic High Power Current Sensing Resistors. | | **Resistance** | 0.010 $\Omega$ (10m$\Omega$) | Very low resistance for minimal voltage drop. | | **Tolerance** | $\pm5\%$ (J) | Industrial standard precision. | | **Size / Package** | 0805 | Surface Mount (SMD) - 2.0mm x 1.25mm. | | **Power Rating** | 0.25W (1/4W) | High power density for its size. | | **Material** | Metal Foil / Thick Film | Designed for stability and heat dissipation. | --- ### 2. Part Number Breakdown (Nomenclature) To understand this specific component, we can decode the alphanumeric string: * **WW**: Walsin Power / Low Ohmic Series. * **08**: Size code (0805 metric equivalent 2012). * **R**: Special feature code (typically refers to the manufacturing process or power upgrade). * **R010**: Resistance value. The 'R' acts as a decimal point ($0.010 \Omega$). * **J**: Tolerance code ($J = \pm5\%$). * **Q**: Packaging code (usually refers to 7" embossed plastic tape). * **L**: Termination/Environmental code (Lead-free / RoHS compliant). --- ### 3. Key Applications Because this is a **Current Sensing Resistor** (Shunt), it is used to measure the flow of electricity in a circuit by monitoring the small voltage drop across it ($V = I \times R$). * **Power Management:** Used in DC-DC converters and battery management systems (BMS). * **Over-Current Protection:** Detecting spikes in current to trigger safety shut-offs. * **Motor Control:** Monitoring feedback loops in small robotics or fans. * **Consumer Electronics:** Power adapters and chargers for laptops or smartphones. --- ### 4. Advantages * **Low TCR:** (Temperature Coefficient of Resistance) Ensures the resistance stays stable even as the part heats up. * **High Reliability:** Built to withstand thermal shocks and vibration common in industrial settings. * **Compact Footprint:** The 0805 size is ideal for high-density Printed Circuit Boards (PCBs).