The **FCI1608F-R22K** is a surface-mount (SMD) multilayer chip inductor manufactured by **Bourns** (or similar manufacturers following the same naming convention). It is part of the FCI series, which is designed for high-frequency applications. --- ## 1. Technical Specifications | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 0.22 µH (220 nH) | Measured at a specific test frequency | | **Tolerance** | ±10% (K) | The actual value ranges from 0.198 to 0.242 µH | | **Package Size** | 1608 (EIA 0603) | 1.6mm x 0.8mm dimensions | | **Rated Current** | ~250 mA | Maximum current it can handle before overheating | | **DC Resistance (DCR)** | ~0.50 Ω (Max) | Resistance of the internal conductor | | **Self-Resonant Frequency** | ~250 MHz | The point where it stops acting as an inductor | | **Operating Temp** | -40°C to +125°C | Standard industrial temperature range | --- ## 2. Part Number Breakdown The part number provides a map of its physical and electrical characteristics: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **FCI** | Series | Ferrite Chip Inductor | | **1608** | Case Size | 1.6 x 0.8 mm (metric) / 0603 (inch) | | **F** | Material | Ferrite core material | | **R22** | Value | 0.22 µH (R acts as a decimal point) | | **K** | Tolerance | ±10% | --- ## 3. Physical Construction Unlike wire-wound inductors, the **FCI1608F** uses a **multilayer structure**. - **Core Material:** Ferrite. This allows for high magnetic flux density in a small volume. - **Layers:** Alternating layers of ceramic/ferrite material and conductive silver traces are printed and fired together. - **Termination:** Usually tin-plated over a nickel barrier to ensure good solderability and prevent leaching during the SMT process. --- ## 4. Key Applications Because of its small size and ferrite properties, this inductor is typically used for: * **Noise Suppression:** Filtering high-frequency electromagnetic interference (EMI) in digital circuits. * **Signal Conditioning:** Used in RF (Radio Frequency) circuits for impedance matching. * **Mobile Devices:** Found in smartphones, tablets, and wearables due to the 0603 footprint. * **Power Decoupling:** Preventing noise from jumping between power rails.