## Technical Overview of SDQ25-100-R The **SDQ25-100-R** is a high-performance, surface-mount (SMD), dual-winding shielded inductor manufactured by **Eaton (formerly Bussmann)**. It belongs to the **SDQ series**, which is specifically designed for applications requiring high power density and versatile configurations. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 10.0 µH (per winding) | | **Current Rating (Irms)** | 1.83 Amperes | | **Saturation Current (Isat)** | 2.58 Amperes | | **DC Resistance (DCR)** | 0.0883 Ω (Max) | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | 5.2mm x 5.2mm x 2.5mm | | **Termination** | Ferrite core with tin-plated copper | --- ### 2. Core Electronic Features #### A. Dual Winding Versatility The "Dual" nature means the part contains two separate coils on a single core. This allows the component to be used in three distinct ways: 1. **Series Connection:** Inductance becomes $4 \times L$ (40 µH). 2. **Parallel Connection:** Inductance remains $L$ (10 µH) but current capacity doubles. 3. **1:1 Transformer:** Can be used for SEPIC converters or isolation. #### B. Magnetic Shielding The component is magnetically shielded. This is critical for high-density PCB layouts because it minimizes **Electromagnetic Interference (EMI)**, preventing the inductor's magnetic field from affecting neighboring sensitive components. #### C. High Power Density Despite its small footprint ($5.2 \times 5.2$ mm), it manages relatively high saturation currents, making it ideal for compact DC-DC converters. --- ### 3. Common Applications * **SEPIC Converters:** Frequently used in Single-Ended Primary-Inductor Converters where two inductors are needed. * **Buck/Boost Converters:** Used as the primary energy storage element. * **Common Mode Chokes:** Can be wired to filter noise out of power lines. * **Battery Powered Devices:** Ideal for smartphones, tablets, and wearables due to the low profile (2.5mm height). --- ### 4. Circuit Symbol & Wiring ```text Winding 1: Pins 1 --- 2 Winding 2: Pins 4 --- 3 [ Dot indicates Polarity/Start of Winding ] ```