The **SD25-6R8-R** is a high-performance, low-profile power inductor part of the SD series manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. These components are primarily used for power management in compact electronic devices. --- ### 1. Key Technical Specifications The part number itself contains encoded information about its electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 6.8 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.0461 Ω (Typical) | | **Irms (Root Mean Square Current)** | 2.11 Amperes | | **Isat (Saturation Current)** | 1.83 Amperes | | **Package Size** | 5.2mm x 5.2mm x 2.5mm | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Construction The SD25 series is designed with specific materials to optimize efficiency: * **Core Material:** Ferrite core, which provides high efficiency and low core losses. * **Shielding:** It is a **magnetically shielded** inductor. This is critical for high-density PCB layouts because it minimizes Electromagnetic Interference (EMI) with neighboring components. * **Form Factor:** Surface Mount Device (SMD). The "25" in the name refers to the 2.5mm height, making it ideal for thin electronics. --- ### 3. Applications The SD25-6R8-R is commonly found in the following circuits: 1. **DC-DC Converters:** Used as a storage element in buck (step-down) or boost (step-up) converters. 2. **Portable Electronics:** Smartphones, tablets, and handheld GPS units. 3. **Computer Peripherals:** Hard disk drives (HDDs) and solid-state drives (SSDs). 4. **Battery Powered Systems:** Where high efficiency and small footprint are required to extend battery life. --- ### 4. Part Number Breakdown ```text SD 25 - 6R8 - R | | | | | | | └─ RoHS Compliant | | └─────── Inductance Value (6.8 microhenries) | └──────────── Size/Height Code (2.5mm max height) └─────────────── Series Name (Shielded Drum Inductor) ```