### Overview of the SD52-270-R The **SD52-270-R** is a high-power density, shielded drum core inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It is part of the SD52 series, designed specifically for applications where space is limited and electromagnetic interference (EMI) needs to be minimized. --- ### Key Technical Specifications Below are the primary electronic characteristics of the SD52-270-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 27 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.134 Ω (Typical) | | **Saturation Current ($I_{sat}$)** | 1.05 A | | **RMS Current ($I_{rms}$)** | 1.18 A | | **Shielding** | Magnetic Shielding (Ferrite Drum) | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Operating Temperature** | -40°C to +125°C | --- ### Core Electronic Features #### 1. Magnetic Shielding The "Shielded" construction means the inductor is encased in a ferrite material. This serves two purposes: * **EMI Reduction:** It prevents the magnetic field generated by the inductor from interfering with nearby sensitive components. * **Efficiency:** It keeps the magnetic flux contained within the core, improving the coupling and efficiency of the component. #### 2. High Power Density Despite its small footprint (approximately 5.2mm x 5.2mm x 2.0mm), the SD52 series is engineered to handle relatively high currents. The "270" in the part number represents the inductance value: **27 x 10^0 = 27 µH**. #### 3. Saturation and RMS Current * **$I_{sat}$ (1.05 A):** This is the point where the inductance drops by a specified percentage (usually 30%) because the core cannot hold more magnetic flux. * **$I_{rms}$ (1.18 A):** This represents the continuous DC current that will cause the component's temperature to rise by 40°C above ambient. --- ### Common Applications The SD52-270-R is typically used in power management circuits, including: * **DC-DC Converters:** Buck, Boost, and SEPIC topologies. * **Battery Powered Devices:** Smartphones, tablets, and portable medical equipment. * **Computer Peripherals:** High-efficiency power supplies for hard drives and SSDs. * **LED Drivers:** Providing stable current for lighting applications. --- ### Example Footprint/Land Pattern ```markdown Dimensions (Nominal): - Length: 5.2 mm - Width: 5.2 mm - Height: 2.0 mm (Max) ```