The **CF322513-R22K** is a high-frequency Surface Mount Device (SMD) wire-wound chip inductor. This component is typically used in signal processing, telecommunications, and high-frequency filtering applications. ### 1. Part Number Breakdown The nomenclature provides specific details about the component's physical and electrical characteristics: | Code Segment | Description | Meaning | | :--- | :--- | :--- | | **CF** | Series Prefix | Ferrite Core Chip Inductor | | **322513** | Dimensions (Metric) | 3.2mm x 2.5mm x 1.3mm (EIA 1210 Case) | | **R22** | Inductance Value | 0.22 µH (Microhenries) | | **K** | Tolerance | ±10% | --- ### 2. Technical Specifications These are the typical electrical parameters for this specific part: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.22 µH | | **Tolerance** | ±10% | | **Quality Factor (Q min)** | ~30 at 25.2 MHz | | **Self-Resonant Frequency (SRF)** | ~450 MHz | | **DC Resistance (DCR max)** | ~0.40 Ω | | **Rated Current (Idc)** | ~450 mA | | **Operating Temperature** | -40°C to +125°C | --- ### 3. Key Features and Construction * **Wire-Wound Technology:** Offers higher Q factors and higher current-carrying capabilities compared to multilayer inductors. * **Ferrite Core:** Provides high magnetic permeability, allowing for high inductance in a small footprint. * **SMD Package:** Designed for automated pick-and-place assembly (1210 package size). * **High Reliability:** The molded or coated construction protects the fine copper wire from environmental factors and mechanical stress. ### 4. Common Applications * **Filtering:** Used in LC filters to block high-frequency noise in power lines or signal paths. * **Impedance Matching:** Used in RF circuits to ensure maximum power transfer between stages. * **Decoupling:** Prevents high-frequency interference from affecting sensitive integrated circuits (ICs). * **Telecommunications:** Frequently found in modems, base stations, and mobile communication devices. ---