The **WI252018-R82KF-11** is a high-frequency, surface-mount (SMD) wire-wound chip inductor. These components are commonly used in RF (Radio Frequency) circuits due to their high precision and stability. --- ### 1. Part Number Breakdown Understanding the alphanumeric code helps identify the component's physical and electrical properties: | Segment | Meaning | Detail | | :--- | :--- | :--- | | **WI** | Series Type | Wire-wound Inductor | | **252018** | Case Size | 2.5mm x 2.0mm x 1.8mm (Metric) | | **R82** | Inductance Value | 0.82 µH (Microhenries) | | **K** | Tolerance | ±10% | | **F** | Termination | Lead-free (RoHS Compliant) / Gold or Tin plating | | **11** | Internal Code | Manufacturer-specific revision or packaging code | --- ### 2. Key Electrical Characteristics While specific values can vary slightly by manufacturer (such as Chilisin or Bourns), a typical R82 wire-wound inductor follows these specifications: * **Inductance:** 0.82 µH. * **Quality Factor (Q):** Usually high (typically 25-45 at specific frequencies), making it ideal for resonant circuits. * **Self-Resonant Frequency (SRF):** Typically in the range of 250 MHz to 400 MHz. * **DC Resistance (DCR):** Usually between 0.50 Ω and 1.2 Ω. * **Rated Current:** Generally handles between 180mA and 450mA. --- ### 3. Physical Construction The **Wire-wound** nature of this part offers several advantages over multilayer inductors: 1. **High Q Factors:** Lower energy loss at high frequencies. 2. **Higher Current Handling:** The physical wire can carry more current than printed silver traces in multilayer versions. 3. **Stability:** Better performance across a wide temperature range (typically -40°C to +125°C). --- ### 4. Common Applications Due to its small footprint and high-frequency performance, the WI252018-R82KF-11 is found in: * **Mobile Communication:** Cell phones, GPS receivers, and Wi-Fi modules. * **RF Matching:** Impedance matching circuits for antennas. * **Filtering:** Low-pass or high-pass filters in signal processing. * **Automotive Electronics:** Infotainment systems and wireless sensors.