The **UP1B-101-R** is a specific surface-mount (SMD) power inductor part of the **Uni-Pac (UP)** series, originally manufactured by Cooper Bussmann (now part of Eaton). Below is a detailed breakdown of its specifications, construction, and applications. --- ### 1. Technical Specifications The part number "101" indicates the inductance value, and "R" signifies RoHS compliance. | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 100 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.354 Ohms (Typical) | | **Isat (Saturation Current)** | 0.74 Amps (Current at which inductance drops 10%) | | **Irms (Rated Current)** | 0.82 Amps (Based on temperature rise) | | **Package Size** | UP1B (Approx. 8.9mm x 6.1mm) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Component Construction The UP1B series is designed for high-power density and efficiency. * **Core Material:** Ferrite. This provides high frequency performance and low core losses. * **Shielding:** This is a **non-shielded** drum core design. While cost-effective and capable of handling high saturation currents, it may emit more Electromagnetic Interference (EMI) than shielded versions. * **Termination:** It features robust solderable pads suitable for high-reflow temperatures. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in selecting substitutes: | Segment | Meaning | | :--- | :--- | | **UP** | Series Name (Uni-Pac) | | **1B** | Physical size/case dimensions | | **101** | Inductance Code: 10 + one zero = 100 (in µH) | | **R** | RoHS Compliant / Lead-Free | --- ### 4. Common Applications The UP1B-101-R is typically found in power management circuits where compact size and reliability are required: 1. **DC-DC Converters:** Used in Buck, Boost, and SEPIC topologies. 2. **Filter Chokes:** Used in power supplies to smooth out ripple current and reduce noise. 3. **Consumer Electronics:** Found in laptops, LED drivers, and battery-powered handheld devices. 4. **Industrial Equipment:** Utilized in control circuits and distributed power systems. --- ### 5. Equivalent Considerations If you are looking for a replacement, ensure the following match: * **Footprint:** Must match the 8.9mm x 6.1mm landing pattern. * **Current Rating:** The replacement must have an equal or higher **Isat** and **Irms**. * **DCR:** A higher DC Resistance will lead to more heat and lower efficiency.