## DR1050-3R3-R: Electronic Component Overview The **DR1050-3R3-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by Eaton (formerly Cooper Bussmann). It is part of the DR series, designed for high efficiency and density in power conversion circuits. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature that defines its electrical characteristics: | Parameter | Specification | Details | | :--- | :--- | :--- | | **Inductance** | 3.3 µH | Nominal inductance at 100 kHz | | **Tolerance** | ±20% | Standard deviation allowance | | **DC Resistance (DCR)** | 14.1 mΩ (Typ) | Internal resistance of the wire | | **Rated Current (Irms)** | 5.8 Amps | Continuous current causing a 40°C rise | | **Saturation Current (Isat)** | 8.0 Amps | Point where inductance drops by 30% | | **Operating Temp** | -40°C to +125°C | Includes self-heating effects | --- ### 2. Physical Construction and Features * **Shielded Design:** The inductor is magnetically shielded. This minimizes Electromagnetic Interference (EMI) with neighboring components, making it ideal for densely packed circuit boards. * **Core Material:** Uses a ferrite core, which provides high efficiency and low core losses at high frequencies. * **Dimensions:** The "1050" designation refers to its physical size: * **Footprint:** Approx. 10.5 mm x 10.3 mm. * **Height:** Max 5.0 mm. * **Construction:** High power density in a low-profile package. --- ### 3. Common Applications The DR1050-3R3-R is primarily used in **DC-DC Converters** and power management systems: 1. **Buck/Boost Converters:** Energy storage element for voltage regulation. 2. **Point of Load (POL):** Used in high-current power supplies for CPUs, GPUs, and FPGAs. 3. **Industrial Electronics:** Found in motor controllers and battery chargers. 4. **Consumer Tech:** Used in servers, workstations, and high-end networking equipment. --- ### 4. Circuit Symbol and Behavior In a schematic, this part is represented by an inductor symbol (coiled wire). Its primary function is to resist changes in electric current and store energy in a magnetic field. Because it is a "3R3" (3.3 µH) value, it is optimized for high-frequency switching power supplies (typically 100 kHz to 1 MHz).