The **SD52-4R7-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is part of the SD52 series, which is designed for high power density and efficiency in compact electronic circuits. --- ### 1. Technical Specifications The table below highlights the core electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0387 Ω (Typical) | | **Saturation Current ($I_{sat}$)** | 2.16 A | | **RMS Current ($I_{rms}$)** | 2.21 A | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 5.2mm x 5.2mm x 2.0mm | | **Shielding** | Shielded (Magnetic) | --- ### 2. Key Features * **Magnetic Shielding:** The inductor is magnetically shielded, which minimizes Electromagnetic Interference (EMI) with surrounding components. This is crucial for dense PCB layouts. * **Low Profile:** With a height of only 2.0mm, it is ideal for thin electronic devices like tablets and ultra-portable laptops. * **Ferrite Core Material:** Provides high efficiency and low core losses at high switching frequencies. * **Durability:** It is designed to handle high-temperature environments and is lead-free/RoHS compliant. --- ### 3. Applications The SD52-4R7-R is commonly found in power management stages where voltage conversion is necessary: 1. **DC-DC Converters:** Used in Buck (step-down), Boost (step-up), and SEPIC topologies. 2. **Portable Electronics:** Smartphones, digital cameras, and handheld gaming consoles. 3. **Computer Peripherals:** SSD power rails and local point-of-load (POL) regulation. 4. **Battery Powered Equipment:** Used to maximize battery life due to its low DCR (minimal power waste as heat). --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **SD52:** Series name (5.2mm footprint). * **4R7:** Inductance value (4.7 microhenries). * **R:** RoHS compliant designation.