The **SD20-8R2-R** is a high-performance, low-profile, shielded surface-mount (SMD) power inductor. It is part of the SD series manufactured by **Eaton (formerly Cooper Bussmann)**. These inductors are widely used in DC-DC converters and power management applications where space is limited and EMI (Electromagnetic Interference) shielding is required. --- ### 1. Key Technical Specifications The part number "8R2" indicates the inductance value, while the "R" suffix typically denotes RoHS compliance. | Parameter | Specification | |:---|:---| | **Inductance** | 8.2 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~0.116 Ω (Typical) | | **Rated Current (Irms)** | ~1.42 Amps | | **Saturation Current (Isat)** | ~1.16 Amps | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Characteristics The "SD20" designation refers to the physical size of the component. It is designed for high-density circuit boards. * **Dimensions:** Approximately 5.2mm x 5.2mm. * **Height:** 2.0mm (Low profile). * **Construction:** Ferrite drum core with a ferrite sleeve to minimize EMI. * **Termination:** Matte Tin over Phosphor Bronze. --- ### 3. Functional Applications The SD20-8R2-R is engineered for power efficiency and noise suppression in the following scenarios: 1. **Buck/Boost Converters:** Used as the energy storage element in DC-DC voltage regulation. 2. **Mobile Electronics:** Ideal for smartphones, tablets, and wearables due to its small footprint. 3. **Filtering:** Used in LC filters to smooth out voltage ripples and reduce electrical noise. 4. **Computer Peripherals:** Found in SSDs and laptop motherboards for localized power regulation. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | |:---|:---| | **SD** | Series Name (Shielded Drum Inductor) | | **20** | Size Code (Refers to 2.0mm height) | | **8R2** | Inductance Value (8.2 µH) | | **-R** | RoHS Compliant / Lead-Free | ---