## Analysis of the DRQ125-R47-R Inductor The **DRQ125-R47-R** is a specific model of high-power, shielded inductor from the **DRQ series**, manufactured by Eaton (formerly Bussmann). This component is a "Dual Winding" inductor, meaning it contains two separate coils within a single package. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.47 µH (Microhenries) | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~17.6 Amperes | | **Saturation Current (Isat)** | ~28.0 Amperes | | **DC Resistance (DCR)** | ~1.75 mΩ (typical) | | **Operating Temperature** | -40°C to +125°C | | **Size / Dimension** | 12.5mm x 12.5mm x 6.0mm | | **Shielding** | Magnetically Shielded (Low EMI) | --- ### 2. Part Number Breakdown Understanding the nomenclature helps identify the component's characteristics: * **DRQ**: Series name (Dual Winding, Shielded Drum Core). * **125**: Size code (approx. 12.5mm square). * **R47**: The inductance value. The "R" acts as a decimal point, signifying **0.47 µH**. * **-R**: Indicates the product is RoHS compliant. --- ### 3. Core Features and Functionality #### Dual Winding Versatility The most distinct feature of this part is its two separate windings. This allows it to be used in several different configurations: 1. **Series Connection:** Increases the total inductance. 2. **Parallel Connection:** Maintains inductance but increases the current-carrying capacity. 3. **1:1 Transformer:** Can be used as a SEPIC (Single-Ended Primary-Inductor Converter) or flyback transformer. 4. **Common Mode Choke:** Used for filtering noise on two lines. #### High Efficiency and Low EMI * **Magnetically Shielded:** The drum core is wrapped in a ferrite sleeve to contain the magnetic field. This prevents the inductor from interfering with nearby sensitive components on the PCB. * **Low DCR:** The very low direct current resistance ensures minimal power loss through heat, making it ideal for high-efficiency power supplies. --- ### 4. Common Applications Due to its high current capability and dual-winding nature, the DRQ125-R47-R is frequently found in: * **DC-DC Converters:** Specifically SEPIC, Buck-Boost, and Multi-phase topologies. * **Industrial Electronics:** Motor control and power distribution. * **Computer Hardware:** VRMs (Voltage Regulator Modules) for high-performance processors. * **Battery Powered Systems:** Where efficiency and space-saving (one component doing the work of two) are critical.