### Overview: UP2C-3R3-R Inductor The **UP2C-3R3-R** is a high-power, shielded surface-mount (SMD) inductor belonging to the **Uni-Pac (UP)** series, manufactured by Eaton (formerly Bussmann). It is primarily designed for DC-DC converters and energy storage applications where space is limited but high current handling is required. --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 3.3 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 4.41 Amps | | **Saturation Current (Isat)** | 5.30 Amps | | **DC Resistance (DCR)** | 0.0195 Ohms (Max) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Shielded (Drum Core) | | **Package / Case** | 12.9mm x 9.4mm x 5.2mm | --- ### Core Construction and Design The UP2C-3R3-R utilizes specific engineering choices to balance efficiency and size: 1. **Magnetic Shielding:** The part features a ferrite drum core with a sleeve or resin-based shielding. This minimizes **Electromagnetic Interference (EMI)**, making it suitable for densely packed circuit boards where noise could interfere with nearby sensitive components. 2. **Ferrite Material:** The core is made of a high-permeability ferrite material, which ensures low core losses at high frequencies. 3. **Flat Top Design:** The physical casing is designed with a flat top to facilitate automated "pick-and-place" assembly using vacuum nozzles. --- ### Typical Applications Due to its high current rating and low DCR (Direct Current Resistance), this part is commonly found in: * **DC-DC Converters:** Buck, Boost, and SEPIC topologies. * **Computer Peripherals:** Power supplies for hard drives and graphic cards. * **Telecommunications:** Distributed power systems and base stations. * **Industrial Electronics:** Used in high-density power modules. --- ### Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **UP2C:** The series name (Uni-Pac, Size 2C). * **3R3:** Represents the inductance value. "R" acts as the decimal point ($3.3$ µH). * **-R:** Indicates the product is RoHS compliant (Lead-free). ---