The **DRA124-820-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 industrial applications requiring high power density and reliability. --- ### 1. Key Technical Specifications The part number follows a specific naming convention that defines its physical and electrical characteristics. | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 82.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 148 mΩ (Nominal) | | **Irms (Rated Current)** | 1.84 Amperes | | **Isat (Saturation Current)** | 2.05 Amperes | | **Shielding** | Magnetically Shielded | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +165°C | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying the component's footprint and values: 1. **DRA**: Series name (Automotive High Power Density). 2. **124**: Physical dimensions (approx. 12.5mm x 12.5mm x 4.5mm). 3. **820**: Inductance code ($82 \times 10^0$ = 82 µH). 4. **R**: RoHS compliant. --- ### 3. Key Electronic Features * **Magnetic Shielding:** The component is enclosed in a ferrite core. This minimizes Electromagnetic Interference (EMI), preventing the inductor's magnetic field from affecting nearby sensitive components on the PCB. * **High Temperature Rating:** Unlike standard consumer inductors, the DRA series is AEC-Q200 qualified, meaning it can handle the extreme heat found in automotive engine compartments (up to 165°C). * **High Power Density:** It is designed to provide high inductance and current handling in a relatively low-profile SMT package. --- ### 4. Common Applications The DRA124-820-R is typically found in the following circuits: * **DC-DC Converters:** Used for energy storage in buck, boost, or SEPIC converters. * **Automotive Electronics:** Powering Infotainment systems, ECU power supplies, and LED lighting. * **Industrial Controls:** Power regulation for heavy-duty machinery sensors and controllers. * **Noise Filtering:** Used as a choke to filter out high-frequency noise in power lines. ---