The **SD20-101-R** is a high-power density, low-profile inductor typically manufactured by **Eaton (formerly Coiltronics)**. It is part of the SD20 series, designed specifically for applications where space is limited but power requirements are high. --- ### 1. Key Technical Specifications The "101" in the part number represents the inductance value, while the "R" indicates RoHS compliance. | Parameter | Value | | :--- | :--- | | **Inductance** | 100 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.584 Ω (Typical) | | **Saturation Current ($I_{sat}$)** | 0.52 Amps | | **RMS Current ($I_{rms}$)** | 0.57 Amps | | **Dimensions** | 5.2mm x 5.2mm x 2.0mm | | **Shielding** | Ferrite Drum Core (Shielded) | --- ### 2. Core Features * **Magnetic Shielding:** The component is magnetically shielded, which minimizes Electromagnetic Interference (EMI). This is crucial for densely packed circuit boards where noise can affect nearby components. * **Low Profile:** With a maximum height of only 2.0mm, it is ideal for thin consumer electronics like tablets, smartphones, and portable medical devices. * **Ferrite Core Construction:** Provides high efficiency and low core losses at high frequencies. * **Surface Mount (SMD):** Designed for automated pick-and-place assembly. --- ### 3. Common Applications The SD20-101-R is versatile and generally used in power management circuits: 1. **DC-DC Converters:** Used in buck (step-down), boost (step-up), and SEPIC topologies. 2. **LED Drivers:** Provides stable current regulation for backlighting or flashlights. 3. **Battery Powered Devices:** Due to its small footprint and efficiency. 4. **Computer Peripherals:** Found in laptops and SSD power rails. --- ### 4. Circuit Symbol and Footprint ```python # Representation of the SD20 Series Footprint (Approximate) # Total Area: 5.2mm x 5.2mm [ Terminal 1 ] ---- (Inductor Core) ---- [ Terminal 2 ] # Recommended Solder Pad dimensions (mm): # Width: 1.5mm # Length: 1.9mm # Gap: 2.2mm ```