The **MCI18F-R47KA** is a surface-mount (SMD) power inductor commonly used in compact electronic circuits for power management and signal filtering. This part is typically manufactured by companies like **Taiyo Yuden** or **Coilmaster**. --- ### 1. General Specifications The part number follows a specific nomenclature that defines its electrical and physical characteristics. | Parameter | Value | | :--- | :--- | | **Inductance** | 0.47 µH (Microhenries) | | **Tolerance** | ±10% (Indicated by the "K") | | **Case Size** | 1812 (Metric 4532) | | **Component Type** | Multilayer Chip Inductor / Ferrite Core | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### 2. Part Number Breakdown Understanding the code helps in identifying replacements or similar components: * **MCI**: Series prefix (Multilayer Chip Inductor). * **18**: Represents the physical size (Length: 0.18 inches / 4.5mm). * **F**: Often denotes the material type or high-frequency characteristic. * **R47**: The inductance value. "R" acts as a decimal point ($0.47$). * **K**: The tolerance code ($J = \pm5\%$, $K = \pm10\%$, $M = \pm20\%$). * **A**: Usually refers to the packaging type (e.g., Taped & Reeled) or a specific revision. --- ### 3. Key Electrical Features Because this is a ferrite-based multilayer inductor, it possesses specific performance traits: 1. **High Self-Resonant Frequency (SRF):** Due to the multilayer construction, it can operate effectively at high frequencies without becoming capacitive too early. 2. **Low DC Resistance (DCR):** Designed to minimize power loss as heat when current passes through the coil. 3. **Magnetic Shielding:** The multilayer structure inherently provides a level of magnetic shielding, reducing Electromagnetic Interference (EMI) with neighboring components. --- ### 4. Common Applications These components are generally found in low-to-medium power environments: * **DC-DC Converters:** Used for energy storage in switching power supplies for mobile devices. * **EMI Suppression:** Filtering out high-frequency noise in signal lines. * **Communication Equipment:** Found in Bluetooth modules, Wi-Fi routers, and smartphones. * **Consumer Electronics:** Hard drives, digital cameras, and tablets. --- ### 5. Mechanical Dimensions (1812 Package) | Dimension | Millimeters (mm) | Inches (in) | | :--- | :--- | :--- | | **Length (L)** | 4.5 ± 0.3 | 0.177 | | **Width (W)** | 3.2 ± 0.3 | 0.126 | | **Thickness (T)** | ~3.2 max | ~0.126 |