The **FPV325-20-R050CS** is a specialized electronic component, typically categorized as a **Surface Mount (SMD) Current Sense Resistor**. It is designed for precision power management and current monitoring applications. --- ## 1. Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Component Type** | Current Sense Resistor / Metal Foil Resistor | | **Resistance Value** | 50 mΩ (0.050 Ω) | | **Tolerance** | ±1% (typically indicated by the "F" or specific series code) | | **Power Rating** | 2.0 Watts (indicated by the "20") | | **Package Size** | 3225 (Metric) / 1210 (Imperial) | | **Temperature Coefficient (TCR)** | ±50ppm/°C to ±100ppm/°C | | **Construction** | Metal Plate / Low Inductance | --- ## 2. Part Number Breakdown Understanding the nomenclature helps in identifying the part's capabilities: * **FPV:** Series identifier (often associated with High Power, Low Resistance series). * **325:** Refers to the physical dimensions (3.2mm x 2.5mm, or 1210 footprint). * **20:** Represents the Power Rating (2.0 Watts). * **R050:** The resistance value ($0.050$ Ohms). * **CS:** Typically refers to the termination style or packaging (e.g., Chip Standard or specific coating). --- ## 3. Key Electronic Characteristics ### A. Current Sensing Principle This resistor acts as a "shunt." By placing it in series with a load, a small voltage drop occurs across the resistor ($V = I \times R$). Because the resistance is very low ($50 m\Omega$), the power loss is minimized while allowing a microcontroller or power IC to measure the current flowing through the circuit. ### B. Low Inductance Because this is a metal plate resistor, it has parasitic inductance significantly lower than wire-wound resistors. This makes it ideal for high-frequency switching power supplies where signal integrity is crucial. ### C. Thermal Stability The "CS" series often features enhanced heat dissipation. In FPV (First Person View) drones or high-power robotics (common uses for this part), managing heat at 2 Watts is critical to prevent "thermal drift," which would otherwise cause inaccurate current readings. --- ## 4. Typical Applications * **FPV Drone Power Distribution Boards (PDBs):** Monitoring battery discharge rates. * **Battery Management Systems (BMS):** Measuring charge and discharge cycles. * **DC-DC Converters:** Providing feedback for over-current protection. * **Motor Controllers:** Monitoring Phase current to prevent motor burnout. ---