The **WI252018-R82KF-55** is a specific surface-mount (SMD) wire-wound chip inductor. These components are used primarily in high-frequency circuits to filter noise or store energy in magnetic fields. Below is a detailed breakdown of the electronic specifications and part numbering logic. --- ### 1. Specification Overview | Feature | Description | | :--- | :--- | | **Component Type** | Wire-wound Chip Inductor | | **Inductance Value** | 0.82 µH (Microhenries) | | **Tolerance** | ±10% (K) | | **Case Size** | 2520 (Metric) / 1008 (Imperial) | | **Construction** | Wire-wound on a ceramic or ferrite core | | **Mounting Type** | Surface Mount Device (SMD/SMT) | --- ### 2. Part Number Breakdown The alphanumeric code follows a standard industry format for inductive components: * **WI**: Series prefix (Wire-wound Inductor). * **252018**: Dimensions of the component. * Length: 2.5 mm * Width: 2.0 mm * Height: 1.8 mm * **R82**: The Inductance value. The "R" acts as a decimal point. * `R82` = 0.82 µH. * **K**: Tolerance code. * `K` = ±10%. (Common alternatives: J = ±5%, M = ±20%). * **F**: Likely indicates Lead-Free / RoHS Compliant. * **55**: Specific manufacturer sub-series or packaging code (often relating to the core material or reel size). --- ### 3. Key Performance Characteristics Wire-wound inductors like the WI252018 series are chosen for specific electrical advantages over multilayer inductors: 1. **High Q Factor**: Because they use actual wire coils, they have lower DC resistance (DCR) and a higher Quality (Q) factor, making them efficient at high frequencies. 2. **High Current Handling**: They can typically handle higher saturation currents compared to multilayer chips of the same size. 3. **SRF (Self-Resonant Frequency)**: These parts are designed to operate below their SRF to ensure they maintain inductive behavior rather than becoming capacitive. ### 4. Typical Applications * **RF Communication**: Used in matching circuits for antennas. * **Filtering**: High-frequency noise suppression in power lines. * **Signal Processing**: Used in oscillators and resonance circuits for telecommunications.