The **48NDR-2R5-R** is a specific surface-mount power inductor manufactured by **Coiltronics** (a brand under Eaton/Cooper Industries). These components are primarily used for energy storage and filtering in power conversion circuits. --- ### 1. Technical Specifications The part number follows a specific nomenclature that defines its electrical and physical characteristics: | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 2.5 µH (Microhenries) | | **Tolerance** | ±20% | | **Current Rating (Irms)** | Approximately 5.0 A to 6.5 A (Variable by ambient temp) | | **Saturation Current (Isat)** | High saturation capability for peak currents | | **DC Resistance (DCR)** | Low resistance for high efficiency | | **Package Type** | Surface Mount Device (SMD) | | **Series** | DR Series (High power density, shielded) | ### 2. Physical Construction The "DR" series features a **shielded drum core** construction. This is critical for modern electronics because: * **Magnetic Shielding:** It minimizes Electromagnetic Interference (EMI), preventing the inductor's magnetic field from affecting nearby sensitive components. * **Ferrite Core:** The core material is optimized for high-frequency switching power supplies. * **Ruggedness:** The "R" suffix often denotes **RoHS compliance** and lead-free construction. ### 3. Common Applications This inductor is typically found in the following types of circuits: * **DC-DC Converters:** Buck, Boost, and SEPIC converters. * **Computer Peripherals:** Voltage Regulator Modules (VRMs) for CPUs and GPUs. * **Telecommunications:** Base station power modules. * **Consumer Electronics:** Power management in laptops, tablets, and LED drivers. ### 4. Key Advantages 1. **Low Profile:** Designed for compact PCB layouts where vertical space is limited. 2. **High Efficiency:** Low DCR helps minimize power loss as heat. 3. **Stable Performance:** Maintains inductance even under high transient current loads (good saturation characteristics). ---