## Overview of the SD25-R47 Inductor The **SD25-R47** is a high-power, low-profile, shielded surface-mount (SMD) inductor. It is part of the SD series manufactured by **Coiltronics (now part of Eaton)**. These components are primarily used for power management in compact electronic devices. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 6.0 Amps | | **Saturation Current (Isat)** | 8.8 Amps | | **DC Resistance (DCR)** | 9.8 mΩ (Max) | | **Shielding** | Magnetically Shielded | | **Dimensions** | 5.2mm x 5.2mm x 2.5mm | --- ### 2. Core Features * **Magnetic Shielding:** The part is constructed with a ferrite drum and ring core. This design minimizes Electromagnetic Interference (EMI), making it ideal for high-density circuit boards where components are placed close together. * **Low Profile:** With a maximum height of 2.5mm, it is suitable for thin electronic assemblies like tablets, laptops, and hand-held devices. * **High Energy Density:** It is engineered to handle high currents relative to its small physical footprint. * **Construction:** It uses a rugged design that supports high-frequency switching power supplies. --- ### 3. Applications The SD25-R47 is commonly integrated into the following systems: 1. **DC-DC Converters:** Used as a filter or energy storage element in buck, boost, or buck-boost converters. 2. **Portable Electronics:** Found in smartphones, GPS units, and digital cameras. 3. **Computer Peripherals:** Used in SSDs (Solid State Drives) and video cards. 4. **Battery Powered Equipment:** Efficiency is high due to the low DC resistance, which helps extend battery life. --- ### 4. Circuit Symbol and Footprint ```text Inductor Symbol: L1 --UUU-- 0.47 uH Land Pattern (Typical): [ Pad ] --- 2.0mm --- [ Pad ] (Total Width: ~5.5mm) ```