The **DRA124-151-R** is a specific model of high-power, shielded inductor designed and manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is part of the DRA series, which is specifically engineered for automotive and high-temperature environments. --- ## 1. Part Number Breakdown Understanding the nomenclature helps identify the component's core specifications: | Segment | Meaning | Description | | :--- | :--- | :--- | | **DRA** | Series Name | Drum Core, Automotive Grade | | **124** | Size Code | Approx. 12.5mm x 12.5mm x 4.5mm | | **151** | Inductance Value | 150 µH (15 followed by one zero) | | **-R** | RoHS Compliant | Lead-free and compliant with environmental standards | --- ## 2. Technical Specifications The DRA124-151-R is characterized by its ability to handle significant current while maintaining a compact footprint. ### Electrical Characteristics * **Inductance:** 150 µH * **Tolerance:** ±20% * **Rated Current (Irms):** ~1.28 Amps (Current that causes a 40°C temperature rise) * **Saturation Current (Isat):** ~1.62 Amps (Current that causes a 30% drop in inductance) * **DC Resistance (DCR):** ~0.292 Ohms (Typical) ### Physical & Environmental * **Shielding:** Magnetically shielded (minimizes EMI/Interference) * **Mounting Type:** Surface Mount (SMD/SMT) * **Operating Temperature:** -40°C to +165°C (High-temperature rating) * **AEC-Q200 Qualified:** Yes (Certified for automotive use) --- ## 3. Key Internal Components The part consists of four main elements: 1. **Ferrite Core:** A drum-shaped core that provides the magnetic path. 2. **Copper Wire:** Wound around the core to create the inductive field. 3. **Magnetic Shield:** A ferrite sleeve surrounding the winding to contain the magnetic flux. 4. **Terminal Pads:** Solderable surfaces for PCB attachment, designed for high vibration resistance. --- ## 4. Typical Applications Because of its **AEC-Q200** rating and high temperature tolerance, this inductor is commonly found in: * **Automotive Electronics:** Power steering, LED lighting, and engine control units (ECUs). * **Industrial Power Supplies:** DC-DC converters and switching regulators. * **Battery Powered Systems:** Where efficiency and low EMI are critical. ---