## Technical Overview of SD53-4R7-R The **SD53-4R7-R** is a low-profile, shielded surface-mount (SMD) power inductor. It is widely used in power management circuits, specifically for DC-DC conversion, due to its compact size and high efficiency. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.045 Ohms (Max) | | **Rated Current (Isat)** | 2.01 Amperes | | **Rated Current (Irms)** | 1.81 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Dimensions (L x W x H)** | 5.2mm x 5.2mm x 3.0mm | --- ### 2. Breakdown of the Part Number The part number follows a standard nomenclature used by manufacturers like **Eaton (Bussmann)**: * **SD53**: Refers to the series and physical size (approx. 5.2mm footprint and 3.0mm height). * **4R7**: Represents the inductance value. The "R" acts as a decimal point, resulting in **4.7 µH**. * **R**: Indicates that the part is **RoHS compliant**. --- ### 3. Core Features and Benefits * **Magnetic Shielding:** The inductor is magnetically shielded, which minimizes Electromagnetic Interference (EMI). This is critical for densely packed PCBs where components are close to sensitive analog signals. * **Ferrite Core Material:** Provides high efficiency and a high saturation point, ensuring the inductance doesn't drop sharply as current increases. * **Low DCR:** The low DC resistance minimizes power loss through heat, making it ideal for battery-operated devices. * **Flat Top:** The flat surface is designed for reliable high-speed automated "pick and place" assembly. --- ### 4. Common Applications 1. **DC-DC Converters:** Used in "Buck" (step-down) or "Boost" (step-up) regulators. 2. **Portable Electronics:** Found in smartphones, tablets, and handheld gaming consoles. 3. **Computer Peripherals:** Used in SSD power rails and laptop motherboards. 4. **LED Drivers:** Provides stable current for lighting applications. --- ### 5. Footprint (Mechanical Data) ```markdown Top View: _______ | | | 4R7 | (5.2mm Width) |_______| (5.2mm Length) Side View: _______ |_______| (3.0mm Max Height) ```