## SD25-220-R Electronic Component Overview The **SD25-220-R** is a high-power density, low-profile, shielded drum core inductor. It is part of the **SD series** manufactured by Eaton (formerly Bussmann/Coiltronics). These inductors are primarily designed for applications requiring compact footprints and high efficiency. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 22.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.165 Ω (Typical) | | **Rated Current (Irms)** | 1.18 Amps (based on temperature rise) | | **Saturation Current (Isat)** | 1.25 Amps (based on 30% drop in L) | | **Shielding** | Magnetically Shielded | | **Package Size** | SD25 (approx. 5.2 x 5.2 x 2.5 mm) | --- ### 2. Physical Construction & Features * **Shielded Drum Core:** The ferrite core is shielded to minimize Electromagnetic Interference (EMI). This is crucial for dense PCB layouts where inductive noise could affect sensitive nearby components. * **Low Profile:** With a maximum height of 2.5mm, it is ideal for thin consumer electronics. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and complies with RoHS standards. * **Rugged Design:** Designed to withstand high-temperature reflow soldering processes. --- ### 3. Common Applications The SD25-220-R is typically found in the following electronic circuits: 1. **DC-DC Converters:** Used as the energy storage element in Buck (step-down), Boost (step-up), and SEPIC converters. 2. **Battery Powered Devices:** Ideal for smartphones, tablets, and wearables due to its small footprint and efficiency. 3. **LED Drivers:** Used to regulate current in lighting applications. 4. **Computer Peripherals:** Found on motherboards and graphic cards for local voltage regulation. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **SD** | Series Name (Shielded Drum) | | **25** | Size Code (Physical dimensions) | | **220** | Inductance Value (22 + zero zeros = 22µH) | | **R** | RoHS Compliant | ---