## Technical Overview: DRA73-471-R The **DRA73-471-R** is a high-performance, shielded power inductor designed by Eaton (formerly Cooper Bussmann). It belongs to the **DRA series**, which is specifically engineered for high-power density and high-temperature environments, typically automotive applications. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Inductance** | 470 µH (Microhenries) | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 0.449 Amps | | **Saturation Current (Isat)** | 0.531 Amps | | **DC Resistance (DCR)** | 1.488 Ohms (Typical) | | **Operating Temperature** | -40°C to +165°C | | **Dimensions** | 7.6mm x 7.6mm x 3.55mm | | **Shielding** | Magnetically Shielded (Low EMI) | --- ### 2. Core Features & Construction * **AEC-Q200 Qualified:** This is the most critical feature for automotive use, ensuring the part can withstand mechanical shock, vibration, and extreme thermal cycling. * **Magnetic Shielding:** The part is enclosed in a ferrite drum core with a ferrite sleeve. This contains the magnetic flux, minimizing **Electromagnetic Interference (EMI)** with nearby sensitive components. * **High Temperature Stability:** Unlike standard inductors that fail at 125°C, the DRA73 series is rated up to **165°C**, making it suitable for under-the-hood automotive electronics. * **SMD Design:** It is a surface-mount device (SMD) optimized for automated pick-and-place assembly. --- ### 3. Common Applications The high inductance (470 µH) and high-temperature rating make this part ideal for: 1. **Automotive Electronics:** Engine Control Units (ECUs), LED lighting drivers, and infotainment systems. 2. **DC-DC Converters:** Used as energy storage elements in buck, boost, or SEPIC converters. 3. **Industrial Controls:** Power supplies for sensors and actuators in harsh environments. 4. **Filtering:** Used in Pi-filters to smooth out ripple current in power lines. --- ### 4. Part Number Breakdown The part number provides specific manufacturing details: * **DRA:** Series name (Automotive High Power Density). * **73:** Size Code (approx. 7mm width, 3mm height). * **471:** Inductance value in pF (47 + one zero = 470 µH). * **R:** RoHS compliant. ---