The **DRQ125-8R2-R** is a high-power, shielded, dual-winding inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It is part of the DRQ series, which is designed for versatility in power conversion circuits. --- ## 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the DRQ125-8R2-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 8.2 µH | | **Tolerance** | ±20% | | **Number of Windings** | 2 (Dual Winding) | | **DCR (Direct Current Resistance)** | 0.0152 Ω (15.2 mΩ) per winding | | **Irms (Root Mean Square Current)** | 5.37 A | | **Isat (Saturation Current)** | 10.1 A | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 12.5mm x 12.5mm x 6.0mm (SMD) | --- ## 2. Key Internal Components & Materials * **Core Material:** Ferrite. This allows for high-frequency operation with minimal core losses. * **Winding:** Dual copper windings. Because there are two separate coils on the same core, they can be connected in different configurations (Series or Parallel). * **Shielding:** The component is magnetically shielded to minimize EMI (Electromagnetic Interference), which is critical for densely packed PCBs. --- ## 3. Configuration Options Since this is a **Dual Winding** inductor, it can be used in three primary ways: ### A. Series Connection Connecting the two windings in series doubles the inductance but increases the resistance. * **Inductance:** $L_{total} = 32.8 \text{ µH}$ (approximately $4 \times L$ due to mutual coupling). * **Current:** Lower total current capacity. ### B. Parallel Connection Connecting the windings in parallel maintains the base inductance but doubles the current capacity. * **Inductance:** $8.2 \text{ µH}$. * **Current:** $2 \times I_{rms}$. ### C. 1:1 Transformer Used as a SEPIC (Single-Ended Primary-Inductor Converter) or a Flyback transformer where isolation or voltage transformation is needed. --- ## 4. Common Applications The DRQ125-8R2-R is typically found in: 1. **DC-DC Converters:** Specifically SEPIC, Buck, and Boost topologies. 2. **Power Supplies:** Used in industrial automation and telecommunications. 3. **Battery Powered Systems:** Where high efficiency and small footprint are required. 4. **Computer Hardware:** Voltage Regulator Modules (VRMs).