### Overview of SD18-820-R The **SD18-820-R** is a high-power, low-profile surface-mount (SMD) shielded drum core inductor. It belongs to the SD series manufactured by **Eaton (formerly Bussmann)**. These components are primarily used in power management circuits for energy storage and filtering. --- ### Technical Specifications Below are the key electronic parameters for the SD18-820-R: | Parameter | Value | | :--- | :--- | | **Inductance** | 82.0 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 0.654 Amps (A) | | **Saturation Current (Isat)** | 0.812 Amps (A) | | **DC Resistance (DCR)** | 0.442 Ohms (Ω) Typical | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | --- ### Key Features 1. **Magnetic Shielding:** The part is shielded to minimize Electromagnetic Interference (EMI), making it ideal for densely packed circuit boards where noise leakage could affect nearby components. 2. **Ferrite Core:** Utilizes a ferrite drum core for high efficiency and high saturation levels. 3. **Low Profile:** The "SD18" designation refers to the physical size (approx. 5.2mm x 5.2mm x 1.8mm), designed for applications where vertical space is limited. 4. **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS standards. --- ### Common Applications The SD18-820-R is commonly integrated into the following systems: * **DC-DC Converters:** Used for energy storage in buck, boost, or SEPIC converters. * **Battery Powered Devices:** Ideal for smartphones, tablets, and wearables due to its small footprint. * **LED Drivers:** Provides current regulation and filtering for lighting circuits. * **Computer Peripherals:** Used in local power regulation on motherboards or interface cards. --- ### Equivalent Parts / Series Comparison If the SD18-820-R is unavailable, engineers often look at the following series: * **Bourns:** SRR5018 Series * **TDK:** VLS Series * **Wurth Elektronik:** WE-TPC Series