The **UR73D2ATTDR10F** is a high-precision, current-sensing thick film chip resistor manufactured by **KOA Speer Electronics**. It is specifically designed for low-resistance applications where accuracy and reliability are critical. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Manufacturer** | KOA Speer Electronics | | **Resistance Value** | 100 mΩ (0.1 Ω) | | **Tolerance** | ±1% (F) | | **Power Rating** | 0.5 Watts (1/2 W) | | **Package Size** | 0805 (2012 Metric) | | **Temperature Coefficient (TCR)** | ±100 ppm/°C | | **Operating Temperature** | -55°C to +155°C | | **Technology** | Thick Film (Low Resistance) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps in identifying the specific attributes of this component: * **UR73D**: High-precision current sensing type (thick film). * **2A**: Size code for the **0805** inch footprint (2.0mm x 1.25mm). * **T**: Termination material (usually Sn/Tin). * **TD**: Packaging (typically 7-inch punched paper tape). * **R10**: Resistance value. "R" acts as the decimal point ($0.10 \Omega$). * **F**: Tolerance code ($F = \pm 1\%$). --- ### 3. Key Features and Benefits * **Low Resistance:** Specifically engineered for current detection, allowing for minimal voltage drop across the component. * **High Precision:** The $\pm 1\%$ tolerance ensures consistent performance in sensitive feedback loops. * **Durability:** The thick film construction provides excellent heat resistance and mechanical strength. * **AEC-Q200 Qualified:** Most parts in this series meet automotive-grade reliability standards, making them suitable for harsh environments. --- ### 4. Common Applications This component is primarily used in circuits that require **current monitoring** or **overcurrent protection**: 1. **Power Supplies:** Used in DC-DC converters to sense output current. 2. **Battery Management Systems (BMS):** Monitoring charge and discharge rates in lithium-ion packs. 3. **Motor Control:** Detecting stall conditions or controlling torque via current feedback. 4. **Mobile Devices:** Managing power distribution in smartphones and tablets. ---