## Analysis of the UP5-471-R Inductor The **UP5-471-R** is a high-power, shielded drum core surface-mount (SMD) inductor belonging to the **Uni-Pac 5 (UP5)** series, manufactured by **Eaton (formerly Coiltronics)**. ### 1. Technical Specifications The part number follows a specific nomenclature. Below are the key electrical and physical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 470 µH (indicated by "471") | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~0.78 Amps (typical for this size/value) | | **Saturation Current (Isat)** | ~0.84 Amps | | **DC Resistance (DCR)** | ~0.857 Ω (typical) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | SMD (approx. 18.5mm x 15.2mm x 7.1mm) | --- ### 2. Part Number Breakdown Understanding the code helps identify variants within the same family: * **UP5**: The series name (Uni-Pac 5), which dictates the physical footprint and power handling. * **471**: The inductance value in Microhenries (µH). The first two digits are significant figures, and the third is the multiplier ($47 \times 10^1 = 470$). * **-R**: Indicates the part is **RoHS compliant** (Lead-free). --- ### 3. Key Features and Construction The UP5-471-R is designed for heavy-duty electronic applications: * **Shielded Construction**: The inductor features a ferrite shield that minimizes Electromagnetic Interference (EMI), preventing the magnetic field from affecting nearby sensitive components. * **High Power Density**: The Uni-Pac 5 design allows for high current carrying capacity in a relatively low-profile surface mount package. * **Rugged Design**: It is built to withstand high-temperature reflow soldering processes. --- ### 4. Common Applications These inductors are typically found in power management circuits: 1. **DC-DC Converters**: Used as energy storage elements in buck, boost, or buck-boost regulators. 2. **Input/Output Filters**: Used to smooth out voltage ripples and reduce electrical noise in power lines. 3. **Industrial Electronics**: Found in motor drives, solar inverters, and high-current power supplies. 4. **Telecommunications**: Used in base stations and networking hardware. ---