## UP4B-1R5-R Technical Overview The **UP4B-1R5-R** is a high-power, shielded drum core inductor manufactured by **Eaton (formerly Coiltronics)**. It is part of the UP series (Uni-Pac), designed specifically for surface mount (SMD) applications requiring high current handling and rugged durability. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical and physical characteristics of the UP4B-1R5-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 1.5 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 14.2 Amperes | | **Saturation Current (Isat)** | 23.0 Amperes | | **DC Resistance (DCR)** | 3.5 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Core Material** | Ferrite | | **Shielding** | Shielded (Low EMI) | --- ### 2. Physical Dimensions The "UP4B" designation refers to the physical size of the package. It is a large-format SMD component designed for stability and heat dissipation. * **Length:** ~22.35 mm * **Width:** ~15.24 mm * **Height:** ~11.94 mm --- ### 3. Component Breakdown and Materials * **Drum Core:** Made of Ferrite, which provides high magnetic permeability and efficiency at high frequencies. * **Shielding:** The component is shielded, meaning the magnetic flux is contained within the package. This is critical for preventing electromagnetic interference (EMI) with nearby sensitive components on a PCB. * **Base/Terminations:** The "R" at the end of the part number indicates it is **RoHS compliant**, utilizing lead-free finishes on the terminals. --- ### 4. Common Applications The UP4B-1R5-R is typically found in power management circuits where high efficiency and high current are required: 1. **DC-DC Converters:** Used as a storage inductor in buck, boost, or buck-boost regulators. 2. **Computer Power Supplies:** Ideal for Voltage Regulator Modules (VRMs) on high-end motherboards or servers. 3. **Industrial Electronics:** Used in motor controllers and high-power LED drivers. 4. **Telecommunications:** Integrated into base station power distribution units. --- ### 5. Part Number Decoding | Segment | Meaning | | :--- | :--- | | **UP4B** | Series identifier (Uni-Pac size 4B) | | **1R5** | Inductance value (1.5 microhenries) | | **-R** | RoHS compliant / Lead-free |