The **DR1040-150-R** is a high-performance, shielded power inductor designed primarily for DC-DC converter applications. It belongs to the DR series manufactured by Eaton (formerly Coiltronics). --- ### 1. Key Technical Specifications The part number itself follows a specific nomenclature that defines its physical and electrical characteristics. | Parameter | Specification | | :--- | :--- | | **Inductance** | 15.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.050 Ω (Typical) | | **Saturation Current ($I_{sat}$)** | 2.50 Amperes | | **RMS Current ($I_{rms}$)** | 2.48 Amperes | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | --- ### 2. Physical Construction and Form Factor The "1040" in the part number refers to its physical dimensions, which are critical for PCB layout design. * **Dimensions:** Approximately 10.5mm x 10.3mm with a maximum height of 4.0mm. * **Mounting Type:** Surface Mount Device (SMD). * **Material:** Ferrite drum core with a ferrite sleeve to minimize Electromagnetic Interference (EMI). * **RoHS Compliance:** The "-R" suffix indicates that the part is fully compliant with RoHS standards (Lead-free). --- ### 3. Functional Roles in Electronics This component is typically found in power management stages of electronic devices. Its primary functions include: 1. **Energy Storage:** In buck or boost converters, it stores energy in its magnetic field during the switching cycle to provide a steady output current. 2. **Filtering:** It acts as a low-pass filter to smooth out high-frequency ripple current from switching power supplies. 3. **EMI Suppression:** Because it is **magnetically shielded**, it contains its own magnetic flux, preventing interference with sensitive nearby components on the PCB. --- ### 4. Common Applications * **Computing:** High-density VRMs (Voltage Regulator Modules) for laptops and desktops. * **Industrial:** Power supplies for PLC controllers and sensors. * **Consumer Electronics:** LED drivers, game consoles, and battery-powered portable devices.