## Technical Overview: DRA74-8R2-R Inductor The **DRA74-8R2-R** is a high-performance, shielded power inductor designed primarily for automotive and industrial applications. It is manufactured by **Eaton (formerly Bussmann)** and belongs to the **DRA Series**. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 8.2 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 3.24 Amps | | **Saturation Current (Isat)** | 3.55 Amps | | **DC Resistance (DCR)** | 31.7 mΩ (Typical) | | **Operating Temperature** | -40°C to +165°C | | **Dimensions (L x W x H)** | 7.6mm x 7.6mm x 4.35mm | | **Shielding** | Magnetically Shielded | --- ### 2. Core Features & Construction * **AEC-Q200 Qualified:** This part is tested to meet automotive stress-test qualifications, ensuring reliability in harsh environments. * **Magnetic Shielding:** The construction minimizes Electromagnetic Interference (EMI), which is critical in dense PCB layouts and noise-sensitive circuits. * **High Temperature Stability:** With a maximum operating temperature of +165°C, it is suitable for "under-the-hood" automotive applications. * **Construction Material:** Typically utilizes a ferrite core with a ruggedized design to withstand high vibration. --- ### 3. Common Applications The DRA74-8R2-R is commonly integrated into the following systems: 1. **Automotive Electronics:** Power steering (EPS), infotainment systems, and Engine Control Units (ECUs). 2. **DC-DC Converters:** Used as a storage inductor in buck, boost, or SEPIC converters. 3. **Industrial Equipment:** High-temperature sensors and motor control circuits. 4. **LED Lighting:** Constant current drivers for automotive or industrial lighting. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **DRA:** Series name (Automotive High Power Inductor). * **74:** Size code (Approx. 7.6 x 7.6 x 4.35 mm). * **8R2:** Inductance value (8.2 microhenries). * **R:** RoHS compliant.