The **UP2UC-331-R** is a high-performance, surface-mount (SMD) power inductor part of the **Drum Core** series manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). These components are primarily used for energy storage and filtering in DC-DC converters. --- ### 1. Technical Specifications Below are the key electrical and physical characteristics of the UP2UC-331-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 330 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 0.52 Amps (Typical) | | **Saturation Current (Isat)** | 0.56 Amps (Typical) | | **DC Resistance (DCR)** | 0.810 Ohms (Maximum) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | SMD (approx. 9.5mm x 13.0mm) | --- ### 2. Part Number Breakdown The nomenclature reveals the specific configuration of the component: * **UP**: Uni-Pac series (High power density). * **2UC**: Refers to the physical size and low-profile unshielded core style. * **331**: Inductance code. The first two digits (33) are significant figures, and the last digit (1) is the multiplier (10^1). Thus, $33 \times 10^1 = 330$ µH. * **-R**: Indicates compliance with **RoHS** (Lead-free/Green) standards. --- ### 3. Physical Construction & Features * **Core Material:** Ferrite drum core. Ferrite provides high efficiency and low core losses at high frequencies. * **Shielding:** This is an **unshielded** inductor. While this allows for higher current handling in a smaller footprint, it may radiate more electromagnetic interference (EMI) than shielded versions. * **Termination:** Features robust solderable pads designed for pick-and-place surface mount assembly. --- ### 4. Common Applications Due to its inductance value and current rating, the UP2UC-331-R is typically found in: 1. **Buck/Boost Converters:** Providing energy storage for voltage regulation. 2. **Input/Output Filters:** Smoothing out ripple current in power supplies. 3. **Industrial Electronics:** Used in LED drivers, telecommunications equipment, and battery-powered devices. 4. **Computer Peripherals:** Voltage Regulator Modules (VRMs) on older or specialized motherboards. ---