The part number **FPV325-50-R050LS** refers to a high-precision, low-resistance **Current Sense Resistor** (specifically a Metal Foil/Shunt resistor). These components are critical in power management circuits to measure current flow by monitoring the voltage drop across the resistor. --- ### 1. Technical Specifications Table | Feature | Specification | Description | | :--- | :--- | :--- | | **Resistance Value** | 50 mΩ (0.050 Ω) | The electrical resistance of the component. | | **Power Rating** | 0.5W to 1W | Typical power dissipation capability for this series. | | **Tolerance** | ±0.5% or ±1% | The precision of the resistance value (LS suffix). | | **Temperature Coefficient (TCR)** | ±50 ppm/°C | Stability of resistance over temperature changes. | | **Package Size** | 1210 / 2512 | Large surface mount (SMD) footprint to handle heat. | | **Construction** | Metal Foil / Alloy | Provides low noise and high reliability. | --- ### 2. Breakdown of the Part Number The alphanumeric string follows a standard manufacturer coding logic (often associated with brands like **Susumu** or **Cyntec**): * **FPV / FP:** Series designation (often indicating Flame Proof or Precision Foil). * **325:** Physical dimensions (typically 3.2mm x 2.5mm, equivalent to a 1210 metric size). * **50:** Power or Voltage rating code. * **R050:** The resistance value ($0.050 \Omega$). * **L:** Tolerance indicator (e.g., $L = \pm 0.5\%$). * **S:** Packaging or special material code (e.g., Sulfur resistant or Tape & Reel). --- ### 3. Key Electronic Functions In an electronic circuit, this part serves three primary purposes: 1. **Current Monitoring:** Used in conjunction with an Operational Amplifier (Op-Amp) to measure current in battery management systems (BMS). 2. **Overcurrent Protection:** Acts as a sensor to trigger a shutdown if the current exceeds safe limits. 3. **Feedback Loop:** Provides data to DC-DC converters to maintain constant current output. --- ### 4. Typical Application Circuit ```cpp // Logic flow for Current Sensing [Load] --> [FPV325-50-R050LS] --> [Ground] | V [Voltage Drop (V = I * R)] | [Current Sense Amplifier] --> [Microcontroller ADC] ``` ---