The **DRA127-R47-R** is a high-power, shielded drum core inductor specifically designed for automotive and industrial applications. It is manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 15.5 Amperes | | **Saturation Current (Isat)** | 23.1 Amperes | | **DC Resistance (DCR)** | 2.1 mΩ (Typical) | | **Operating Temperature** | -40°C to +165°C | | **Package / Case** | SMD (12.5mm x 12.5mm x 8.0mm) | --- ### 2. Breakdown of Part Numbering Understanding the nomenclature helps in identifying its characteristics: * **DRA**: Series name (Automotive Grade, High Power Density). * **127**: Physical size (Approx. 12.5mm width/length and 7.0mm height). * **R47**: Inductance value (R = decimal point; 0.47 microhenries). * **-R**: RoHS compliant. --- ### 3. Core Features and Benefits * **Shielded Construction:** The inductor is magnetically shielded, which minimizes Electromagnetic Interference (EMI) with surrounding components. * **High Temperature Stability:** Rated for Grade 1 AEC-Q200, making it suitable for under-the-hood automotive environments where heat is a factor. * **High Power Density:** Large wire gauge and core material allow for very high current handling in a relatively small footprint. * **Mechanical Integrity:** Designed to withstand high vibration and mechanical shock. --- ### 4. Typical Applications The DRA127-R47-R is primarily used in power conversion circuits, including: 1. **DC-DC Converters:** Buck, boost, and forward converters. 2. **Automotive Electronics:** Engine Control Units (ECUs), LED lighting drivers, and infotainment systems. 3. **Industrial Equipment:** Power supplies for heavy machinery or telecommunications. 4. **Filter Inductors:** Used in input/output filters to smooth out voltage ripples. --- ### 5. Design Considerations ```markdown * Saturation: Ensure the peak circuit current does not exceed the Isat (23.1A) to avoid a sharp drop in inductance. * Thermal Management: While rated for high temperatures, the DCR (Direct Current Resistance) will cause self-heating; ensure adequate PCB copper for heat dissipation. ```