The **SD25-R47-R** is a high-power, low-profile surface mount (SMT) inductor part of the SD series manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is specifically designed for high-density power applications where space is limited. --- ### 1. Component Overview The "SD" family consists of shielded drum core inductors. The specific alphanumeric code "R47" denotes its inductance value, and the final "R" indicates RoHS compliance. | Feature | Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~5.84 Amps (typical) | | **Saturation Current (Isat)** | ~8.00 Amps (typical) | | **DC Resistance (DCR)** | ~10.4 mΩ (Max) | | **Package Size** | SD25 (approx. 5.2 x 5.2 x 2.5 mm) | | **Operating Temp** | -40°C to +125°C | --- ### 2. Key Technical Characteristics * **Magnetic Shielding:** The component is shielded, which minimizes Electromagnetic Interference (EMI). This is critical for noise-sensitive circuits like mobile phones or medical equipment. * **Low Profile:** The "25" in the part number indicates a height of approximately 2.5mm, making it suitable for compact PCB designs. * **Ferrite Core:** Utilizes a ferrite drum core for high efficiency and high saturation current capabilities. * **Low DCR:** The low Direct Current Resistance ensures minimal power loss through heat, increasing the overall efficiency of power converters. --- ### 3. Common Applications Due to its high current handling and small footprint, the SD25-R47-R is typically found in: 1. **DC-DC Converters:** Used in Buck, Boost, and SEPIC topologies. 2. **Point-of-Load (POL):** Powering CPUs or FPGAs on computer motherboards. 3. **Portable Electronics:** Tablets, VR headsets, and handheld gaming consoles. 4. **LED Drivers:** Providing stable current for high-brightness lighting. --- ### 4. Part Number Breakdown ```text SD 25 - R47 - R | | | | | | | └── RoHS Compliant | | └──────── Inductance Value (R47 = 0.47 microhenries) | └───────────── Package Size (Dimension code) └──────────────── Series Name (Shielded Drum Core) ```