The **UP4B-331-R** is a high-power, shielded surface-mount (SMD) inductor manufactured by Eaton (formerly Bussmann/Coiltronics). It is part of the Uni-Pac™ series, designed specifically for applications requiring high energy storage and low power loss. --- ## 1. Technical Specifications The following table highlights the primary electrical and physical characteristics of the component: | Parameter | Value | | :--- | :--- | | **Inductance** | 330 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.505 Ω (Typical) | | **Current Rating (Irms)** | 1.1 Amps | | **Saturation Current (Isat)** | 1.5 Amps | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | | **Package / Case** | UP4B (approx. 22mm x 15mm) | --- ## 2. Key Features & Materials The UP4B series is engineered for durability and efficiency in power conversion: * **Magnetic Shielding:** The part is shielded to minimize Electromagnetic Interference (EMI), making it suitable for densely packed circuit boards where noise leakage could affect nearby components. * **Ferrite Core Material:** Uses a high-frequency ferrite core that maintains efficiency across various switching frequencies. * **High Power Density:** The "4B" size indicates a larger footprint compared to the 1B or 2B models, allowing for higher current handling and larger inductance values. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS environmental standards. --- ## 3. Common Applications Due to its high inductance (330 µH) and current rating, it is typically used in: 1. **DC-DC Converters:** Acts as an energy storage element in step-up (boost) or step-down (buck) regulators. 2. **Industrial Power Supplies:** Used for filtering and smoothing ripples in power output. 3. **Battery Powered Systems:** Ideal for equipment requiring high efficiency to extend battery life. 4. **LED Drivers:** Used to maintain constant current in high-brightness LED lighting arrays. --- ## 4. Footprint and Mounting The UP4B-331-R is designed for **Surface Mount Technology (SMT)**. ```text Physical Dimensions (Approximate): Length: 22.35 mm Width: 15.24 mm Height: 11.94 mm ``` ---