The **DR1040-2R5-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by Eaton (formerly Bussmann). It belongs to the DR series, which is known for its high power density and electromagnetic interference (EMI) shielding. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 2.5 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 6.46 A | | **Saturation Current (Isat)** | 8.8 A | | **DC Resistance (DCR)** | 10.1 mΩ (Typ) | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | 10.5mm x 10.3mm x 4.0mm | --- ### 2. Breakdown of the Part Number Understanding the nomenclature helps in identifying its physical and electrical characteristics: * **DR:** Series name (Drum Core). * **1040:** Size code (approx. 10mm width/length and 4.0mm height). * **2R5:** Inductance value. The "R" acts as a decimal point (2.5 µH). * **-R:** RoHS compliant (Lead-free). --- ### 3. Core Features and Benefits * **Magnetic Shielding:** The component is shielded, which minimizes EMI. This is crucial for densely packed circuit boards where noise can interfere with nearby components. * **Ferrite Core Material:** Uses a high-permeability ferrite core that allows for high efficiency and low core losses at high frequencies. * **Low Profile:** With a height of only 4.0mm, it is suitable for slim electronic devices. * **High Current Handling:** Designed to handle significant current without reaching magnetic saturation quickly. --- ### 4. Common Applications This inductor is typically used in power management circuits, specifically: 1. **DC-DC Converters:** Used in buck (step-down) or boost (step-up) regulators. 2. **Computer Peripherals:** Found in laptops, servers, and high-end graphics cards. 3. **Industrial Electronics:** Used in battery-powered equipment and distributed power systems. 4. **LED Lighting:** Drivers that require stable current regulation. --- ### 5. Footprint Recommendation (Typical) If you are designing a PCB for this part, the landing pattern usually follows these approximate dimensions: ```text [ 3.6mm ] <-- Pad Width +---------+ | | [4.0mm]| | (Gap between pads: 3.8mm) | | +---------+ ``` ---