The **UR73D2HTTDR10F** 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 in power management are critical. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the specific characteristics of the component: | Segment | Code | Meaning | | :--- | :--- | :--- | | **Series** | `UR73D` | Low Ohmic / Current Sensing (Thick Film) | | **Size** | `2H` | 2010 Inch (5025 Metric) Package | | **Terminal** | `TT` | Surface Mount (Sn Plated) | | **Packaging** | `D` | Taped & Reeled (typically 7" reel) | | **Resistance** | `R10` | 0.10 Ohms (100 mΩ) | | **Tolerance** | `F` | ±1% Precision | --- ### 2. Key Technical Specifications The electrical performance of the UR73D series is optimized for stability under thermal stress. * **Resistance Value:** 100 mΩ ($0.1 \Omega$). * **Power Rating:** 0.75 Watts (3/4 W). * **Tolerance:** ±1.0%. * **Temperature Coefficient (TCR):** ±100 ppm/°C. * **Operating Temperature Range:** -55°C to +155°C. * **Construction:** Thick film element on a ceramic substrate with a protective glass overcoat. --- ### 3. Application Use Cases Because this part is a **Current Sense Resistor** (often called a "Shunt"), it is used to measure current flow by monitoring the voltage drop across it ($V = I \times R$). #### Common Implementations: 1. **Battery Management Systems (BMS):** Monitoring charge and discharge cycles in Li-ion packs. 2. **DC-DC Converters:** Providing feedback for pulse-width modulation (PWM) controllers to regulate output. 3. **Motor Control:** Detecting over-current conditions to prevent motor burnout. 4. **CPU/GPU Power Rails:** Managing high-current delivery in computing hardware. --- ### 4. Advantages of the UR73D Series * **High Power Density:** The 2010 package size handles 0.75W, which is higher than standard general-purpose resistors of the same size. * **Low Inductance:** Thick film construction ensures minimal inductive reactance, making it suitable for high-frequency switching power supplies. * **Durability:** Excellent heat resistance and moisture resistance due to the specialized overcoat. ---