### Technical Overview: UP3B-151-R Power Inductor The **UP3B-151-R** is a high-performance, surface-mount (SMD) power inductor part of the **Uni-Pac™ 3 (UP3B)** series, manufactured by **Eaton (formerly Bussmann/Coiltronics)**. It is specifically designed for applications requiring high energy storage and low power loss. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the UP3B-151-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 150 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.364 Ω (Typical) | | **Rated Current (Irms)** | 1.15 Amps | | **Saturation Current (Isat)** | 1.50 Amps | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 13.9mm x 18.8mm (Approx.) | | **Core Material** | Ferrite | --- ### 2. Physical Construction * **Core Material:** Ferrite core technology provides high frequency performance and low core losses. * **Shielding:** This series is generally **non-shielded** (drum core design), which allows for higher saturation currents but requires careful PCB placement to avoid EMI interference with sensitive components. * **Termination:** Matte tin over copper leads, ensuring excellent solderability for Reflow or Wave soldering. --- ### 3. Common Applications The UP3B-151-R is typically found in power management circuits where voltage conversion is necessary: * **DC-DC Converters:** Used in Buck, Boost, and SEPIC topologies. * **Power Supplies:** Common in industrial electronics, telecommunications, and computer peripherals. * **Filtering:** Acting as an LC filter element to smooth out ripple current in output stages. * **LED Drivers:** Providing stable current for high-brightness lighting applications. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **UP3B**: Series identifier (Uni-Pac 3B size). * **151**: Inductance code (15 followed by 1 zero = 150 µH). * **R**: RoHS compliant. --- ### 5. Design Considerations * **Thermal Management:** The `Irms` rating is based on a temperature rise of approximately 40°C. Ensure adequate airflow or PCB copper traces to heat-sink the part. * **Saturation:** The `Isat` rating indicates the point where inductance drops by 30%. Designing too close to this limit can lead to circuit instability or overheating.