The **UP5-220-R** is a high-performance, power-shielded inductor belonging to the **OCTA-PAC PLUS** series manufactured by Eaton (formerly Bussmann/Coiltronics). These components are unique because they consist of two separate windings that can be connected in series or parallel, making them highly versatile for power conversion circuits. --- ### 1. Technical Specifications The table below summarizes the key electrical characteristics of the UP5-220-R: | Parameter | Specification (Parallel) | Specification (Series) | | :--- | :--- | :--- | | **Inductance ($L$)** | 22.1 $\mu$H | 88.4 $\mu$H | | **Current Rating ($I_{rms}$)** | 6.70 A | 3.35 A | | **Peak Current ($I_{sat}$)** | 9.00 A | 4.50 A | | **DC Resistance (DCR)** | 0.0213 $\Omega$ | 0.0852 $\Omega$ | | **Operating Temp** | -40°C to +125°C | -40°C to +125°C | --- ### 2. Physical Design and Materials The "UP5" designation refers to the physical size and power handling capability within the product family. * **Core Material:** Powered Iron. This provides high saturation flux density, making it stable under heavy current loads. * **Shielding:** The component is magnetically shielded to minimize Electromagnetic Interference (EMI), which is critical for dense PCB layouts. * **Dual Winding:** It contains two identical coils. By changing the PCB trace layout, you can use it as a standard inductor, a 1:1 transformer, or a common-mode choke. * **Case Size:** The "5" size is approximately $18.4 \times 14.1$ mm with a height of $8.9$ mm. --- ### 3. Common Applications Due to its high current capacity and dual-winding nature, it is used in: 1. **DC-DC Converters:** Buck, Boost, Forward, and Sepic topologies. 2. **Battery Powered Equipment:** High-efficiency power supplies for industrial or telecomm tools. 3. **Filtering:** Used as a common-mode choke to filter out noise in power lines. 4. **Voltage Isolation:** Can act as a basic 1:1 isolation transformer for low-voltage signal/power paths. --- ### 4. Connection Diagram (Schematic View) To achieve different inductance values, the pins must be connected correctly: ```text Parallel Connection (Low L, High I): (Pin 1 & 2 connected) ---- [ Coil ] ---- (Pin 3 & 4 connected) Series Connection (High L, Low I): Input (Pin 1) ---- [ Coil A ] ---- (Pin 2 tied to Pin 3) ---- [ Coil B ] ---- Output (Pin 4) ```