## Technical Overview: DRA125-2R2-R The **DRA125-2R2-R** is a high-power, shielded drum core inductor manufactured by **Eaton (formerly Coiltronics)**. It is specifically designed for automotive applications and high-density power environments. ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 2.2 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 11.8 Amperes | | **Saturation Current (Isat)** | 21.6 Amperes | | **DC Resistance (DCR)** | 4.6 mΩ (Max) | | **Operating Temperature** | -40°C to +165°C | | **Package / Case** | 12.5mm x 12.5mm x 6.0mm | --- ### 2. Physical and Material Characteristics * **Shielding:** It is a **magnetically shielded** inductor. This minimizes Electromagnetic Interference (EMI), which is crucial for sensitive automotive electronics and dense PCB layouts. * **Core Material:** Uses a high-temperature ferrite core, allowing it to maintain performance even in engine compartments or high-heat environments. * **Termination:** Features lead-free, RoHS-compliant solder plating, typically compatible with standard SMT (Surface Mount Technology) reflow processes. --- ### 3. Application Use Cases The "DRA" series is automotive-grade (AEC-Q200 qualified), making it ideal for: * **DC-DC Converters:** Used in buck, boost, or SEPIC topologies to store energy. * **Automotive Electronics:** Powering Infotainment systems, ECU (Engine Control Units), and ADAS sensors. * **Industrial Controls:** High-reliability power supplies for heavy machinery. * **LED Drivers:** Providing stable current for high-brightness lighting systems. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **DRA** | Product Series (High Power Shielded Inductor) | | **125** | Size Dimension (approx. 12.5mm width) | | **2R2** | Inductance Value (2.2 µH; R acts as decimal) | | **-R** | RoHS Compliant | ---