The **SD25-100-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is part of the SD series, designed for space-constrained applications requiring high energy storage and efficiency. --- ### 1. Key Technical Specifications | Parameter | Value / Range | | :--- | :--- | | **Inductance** | $10\ \mu\text{H}$ | | **Tolerance** | $\pm 20\%$ | | **Current Rating (Irms)** | $1.73\ \text{A}$ (Typical) | | **Saturation Current (Isat)** | $1.81\ \text{A}$ (Typical) | | **DC Resistance (DCR)** | $0.0645\ \Omega$ (Max) | | **Operating Temperature** | $-40^\circ\text{C}$ to $+125^\circ\text{C}$ | | **Dimensions** | $5.2\text{mm} \times 5.2\text{mm} \times 2.5\text{mm}$ | --- ### 2. Physical Construction and Design The SD25-100-R features specific design elements that make it suitable for modern electronics: * **Magnetic Shielding:** It is a magnetically shielded inductor. This minimizes Electromagnetic Interference (EMI), preventing the magnetic field from affecting surrounding sensitive components on the PCB. * **Ferrite Core:** Utilizes a ferrite drum core which provides high efficiency and low core losses at high frequencies. * **SMD Packaging:** Designed for Surface Mount Device (SMD) assembly, compatible with automated pick-and-place machinery and infrared/convection reflow soldering. * **Low Profile:** The "25" in the part number indicates a height of approximately 2.5mm, making it ideal for thin handheld devices. --- ### 3. Application Use Cases This component is typically found in power management circuits where voltage needs to be regulated or filtered: 1. **DC-DC Converters:** Used in Buck (step-down), Boost (step-up), and SEPIC topologies. 2. **Voltage Regulator Modules (VRMs):** Common in laptops and servers for localized power distribution. 3. **Portable Electronics:** Used in smartphones, tablets, and digital cameras due to its small footprint. 4. **LED Drivers:** Provides steady current flow for high-brightness LED applications. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **SD:** Product Series (Shielded Drum). * **25:** Dimensions (approx. 2.5mm height). * **100:** Inductance Code ($10 \times 10^0 = 10\ \mu\text{H}$). * **R:** RoHS Compliant / Lead-Free. ---