The **DRA125-R47-R** is a high-power, shielded drum core inductor manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the DRA series, specifically designed for automotive and high-reliability industrial applications. --- ## Technical Specifications The following table summarizes the key electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 16.5 Amperes | | **Saturation Current (Isat)** | 25.9 Amperes | | **DC Resistance (DCR)** | 2.54 mΩ (Max) | | **Operating Temperature** | -40°C to +165°C | | **Mounting Type** | Surface Mount (SMD) | | **Shielding** | Magnetically Shielded | --- ## Key Features & Construction ### 1. High Temperature Stability The component is AEC-Q200 Grade 1 qualified, meaning it is tested to withstand the rigorous temperature fluctuations and mechanical stresses found in automotive environments. ### 2. Magnetic Shielding The "DRA" series utilizes a shielded construction. This is critical for high-density PCB layouts as it: * Reduces **Electromagnetic Interference (EMI)**. * Prevents the inductor's magnetic field from affecting neighboring sensitive components. ### 3. Low DCR (DC Resistance) With a maximum DCR of only **2.54 mΩ**, this part is highly efficient. It minimizes power loss through heat, which is essential for high-current power supplies. --- ## Typical Applications The DRA125-R47-R is primarily used in power conversion circuits where high current and reliability are required: * **Automotive Electronics:** Engine control units (ECUs), lighting (LED drivers), and infotainment systems. * **DC-DC Converters:** Used as an energy storage element in Buck, Boost, or SEPIC converters. * **Industrial Equipment:** High-current power supplies and battery-powered systems. * **Solar Inverters:** Handling high-frequency switching for energy management. --- ## Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **DRA** | Product Series (High power, shielded drum core) | | **125** | Size Code (Approx. 12.5mm x 12.5mm footprint) | | **R47** | Inductance Value (R47 = 0.47 µH) | | **-R** | RoHS Compliant / Lead-free |