The **SD20-100-R** is a high-performance, surface-mount (SMD) power inductor part of the SD series manufactured by **Eaton (formerly Cooper Bussmann)**. It is primarily used for power management and DC-DC conversion. --- ### 1. Key Technical Specifications The part number itself reveals specific technical data regarding its physical size and electrical properties. | Parameter | Specification | | :--- | :--- | | **Inductance** | 10.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.149 Ω (Max) | | **Rated Current (Irms)** | 1.31 Amps | | **Saturation Current (Isat)** | 1.08 Amps | | **Dimensions** | 5.2mm x 5.2mm x 2.0mm | | **Construction** | Ferrite core, Shielded | --- ### 2. Physical Construction and Features * **Magnetic Shielding:** The "SD" series is magnetically shielded. This is crucial for high-density PCB layouts as it minimizes Electromagnetic Interference (EMI) with surrounding components. * **Low Profile:** The "20" in the part number indicates a 2.0mm maximum height, making it ideal for thin electronic devices like tablets or handheld sensors. * **Ferrite Core:** Utilizes a ferrite material designed for high-frequency switching power supplies (typically up to 1 MHz+). * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and compliant with RoHS standards. --- ### 3. Functional Applications The SD20-100-R is commonly found in the following circuit types: 1. **Buck/Boost Converters:** Acts as the energy storage element in DC-DC voltage regulators. 2. **Noise Filtering:** Used in LC filters to smooth out ripple current in power lines. 3. **Portable Electronics:** Because of its small 5x5mm footprint, it is used in digital cameras, GPS units, and media players. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in selecting alternatives: | Segment | Meaning | | :--- | :--- | | **SD** | Series Code (Shielded Drum Core) | | **20** | Size Code (Approx. 2.0mm height) | | **100** | Inductance Code ($10 \times 10^0$ = 10µH) | | **-R** | RoHS Compliant | ---