### Overview of the UP3B-220-R The **UP3B-220-R** is a high-performance, shielded power inductor designed and manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It belongs to the Uni-Pac (UP) family, which is widely recognized for its high power density and reliability in surface-mount (SMD) applications. --- ### Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 22 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 3.1 Amps | | **Saturation Current (Isat)** | 3.5 Amps | | **DC Resistance (DCR)** | 40.5 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | Surface Mount (SMD) | | **Dimensions** | 13.9mm x 9.4mm x 6.8mm | --- ### Core Construction & Materials 1. **Magnetic Shielding:** The "UP3B" series features a drum core construction with a ferrite sleeve. This shielding minimizes electromagnetic interference (EMI), making it suitable for noise-sensitive circuits. 2. **Ferrite Core:** Utilizes a high-permeability ferrite material that provides low core losses at high frequencies. 3. **Lead-Free Compliance:** The "-R" suffix indicates that the part is **RoHS compliant**, utilizing lead-free finishes and materials. --- ### Common Applications The UP3B-220-R is primarily used in power management circuits where compact size and high efficiency are required: * **DC-DC Converters:** Buck, Boost, and SEPIC topologies. * **Industrial Electronics:** Power supplies for automation and control systems. * **Computer Peripherals:** Graphics cards, servers, and high-performance storage. * **Telecommunications:** Network hubs and base station power modules. --- ### Performance Characteristics * **Saturation Profile:** The inductor is designed to handle peak currents up to 3.5A before the inductance drops significantly. * **Thermal Stability:** It maintains consistent performance across a wide temperature range, though designers should account for "Self-Heating" caused by the 3.1A RMS current rating. * **High Frequency:** Optimized for switching frequencies ranging from 100 kHz up to several MHz.