The **DRA124-4R7-R** is a high-power, shielded drum core inductor specifically designed for automotive and industrial applications. It is manufactured by Eaton (formerly Bussmann/Coiltronics). --- ### 1. Key Technical Specifications The part number itself contains encoded information about its physical size and electrical properties. | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 4.7 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 7.48 Amperes | | **Saturation Current (Isat)** | 10.9 Amperes | | **DC Resistance (DCR)** | 9.9 mΩ (Max) | | **Operating Temperature** | -40°C to +165°C | | **Package / Case** | 12.5mm x 12.5mm x 4.5mm | --- ### 2. Physical Construction and Features The "DRA" series is built to withstand harsh environments. Its construction features include: * **Shielded Design:** The inductor is magnetically shielded to minimize Electromagnetic Interference (EMI), which is crucial for sensitive automotive electronics. * **High Temperature Rating:** With a maximum operating temperature of **165°C**, it is suitable for "under-the-hood" automotive applications. * **AEC-Q200 Qualified:** It meets the stress test qualification for automotive-grade passive components. * **Mechanical Strength:** Designed to handle high vibration and mechanical shock. --- ### 3. Applications This component is typically found in power management circuits where high efficiency and high current handling are required. 1. **Automotive Systems:** LED lighting, Engine Control Units (ECUs), and infotainment systems. 2. **DC-DC Converters:** Used as an energy storage element in Buck, Boost, or SEPIC converters. 3. **Industrial Power Supplies:** High-density power modules and battery-powered devices. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying similar parts: ```text DRA 124 - 4R7 - R | | | | | | | └─ RoHS Compliant | | └─ Inductance Value (4R7 = 4.7µH) | └─ Size Dimensions (Approx. 12mm width, 4mm height) └─ Series Name (Automotive High Power) ```