The **UP5-3R3-R** is a high-performance, shielded power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the **Uni-Pac 5 (UP5)** series and is designed for high power density and efficiency in DC-DC conversion applications. --- ### 1. Key Technical Specifications The model number encodes specific electrical properties. Below are the primary specifications for the **3R3** variant: | Parameter | Value | | :--- | :--- | | **Inductance** | 3.3 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~14.1 Amps (Typical) | | **Saturation Current (Isat)** | ~18.5 Amps (Typical) | | **DC Resistance (DCR)** | ~4.7 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package/Case** | SMD (Surface Mount Device) | --- ### 2. Component Composition & Design The UP5-3R3-R is engineered with specific materials to handle high current while minimizing electromagnetic interference (EMI). * **Core Material:** Ferrite core technology, which provides high efficiency and low core losses at high frequencies. * **Shielding:** It is a **shielded inductor**. This means the magnetic field is contained within the component, preventing interference with neighboring components on the PCB. * **Termination:** Lead-free (RoHS compliant), denoted by the **-R** suffix. The pads are typically tin-plated for reliable soldering. --- ### 3. Common Applications Due to its low DCR and high current handling, this part is found in power management circuits: 1. **Buck/Boost Converters:** Used as the energy storage element in DC-DC voltage regulators. 2. **Server Power:** Distributed power systems and workstations requiring high-current point-of-load (POL) regulation. 3. **Voltage Regulator Modules (VRM):** Specifically for supplying power to CPUs and GPUs. 4. **Battery Powered Systems:** Where high efficiency is critical to extending battery life. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **UP5** | Product Series (Uni-Pac 5 - specific physical footprint) | | **3R3** | Inductance Value (3.3 microhenries; 'R' acts as decimal) | | **-R** | RoHS Compliant / Lead-Free | ---