The **UP5-101-R** is a high-performance, high-power density power inductor from the **Uni-Pac 5 (UP5)** series manufactured by **Eaton (formerly Bussmann/Coiltronics)**. These components are primarily used in DC-DC converters and energy storage applications. --- ## 1. Technical Specifications The "101" in the part number indicates the inductance value, while the "R" indicates RoHS compliance. | Parameter | Specification | | :--- | :--- | | **Inductance** | 100 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~2.16 Amps (Typical) | | **Saturation Current (Isat)** | ~2.55 Amps (Typical) | | **DC Resistance (DCR)** | 0.163 Ohms (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | --- ## 2. Key Physical Characteristics The UP5 series is known for its rugged construction and specific materials designed for high-frequency efficiency. * **Core Material:** Iron powder core. This provides high saturation flux density, making it less likely to saturate during high-current spikes compared to ferrite cores. * **Shielding:** These are non-shielded or semi-shielded designs, which allows for higher current handling in a smaller footprint, though EMI (Electromagnetic Interference) must be managed in the PCB layout. * **Form Factor:** The UP5-101-R features a robust "drum core" style with a flat top for automated pick-and-place assembly. --- ## 3. Circuit Functions & Applications The UP5-101-R serves several critical roles in electronic assemblies: ### Energy Storage In switching regulators (Buck, Boost, or SEPIC converters), the inductor stores energy in its magnetic field during the "ON" cycle and releases it to the load during the "OFF" cycle. ### Filtering It is used in LC filters to smooth out ripple current from high-frequency switching power supplies, ensuring a clean DC output for sensitive components like MCUs or FPGAs. ### Common Use Cases: * **Industrial Electronics:** Power supplies for PLC controllers. * **Computing:** Voltage Regulator Modules (VRMs) for servers. * **Telecommunications:** Distributed power architectures and base station equipment. --- ## 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: ```text UP5 - 101 - R | | | Series | RoHS Compliant | Inductance Code: First two digits are significant; Third is the multiplier (10 * 10^1 = 100µH) ```