The **SD18-R82** is a surface-mount (SMD) power inductor part of the SD series originally manufactured by Cooper Bussmann (now part of Eaton). It is characterized by its compact size, high power density, and shielded construction. --- ### 1. Technical Specifications The "R82" in the part number denotes the inductance value. | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.82 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | ~3.50 A to 4.00 A (typical) | | **Saturation Current (Isat)** | ~5.00 A to 6.00 A (typical) | | **DC Resistance (DCR)** | ~0.015 - 0.022 Ω (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 5.2mm x 5.2mm x 1.8mm | --- ### 2. Key Features * **Magnetic Shielding:** The component is shielded, which minimizes Electromagnetic Interference (EMI) and prevents magnetic flux from affecting neighboring components on the PCB. * **Low Profile:** With a height of only 1.8mm, it is ideal for thin electronic devices like tablets and laptops. * **Ferrite Core:** Utilizes a ferrite core material which provides high efficiency and low core losses at high frequencies. * **Construction:** Designed for high-density SMT (Surface Mount Technology) assembly. --- ### 3. Common Applications Due to its low inductance and high current handling, the SD18-R82 is typically used in: 1. **DC-DC Converters:** Buck, boost, and forward converters. 2. **Portable Electronics:** Smartphones, handheld GPS units, and digital cameras. 3. **Computer Peripherals:** SSD power rails and high-speed CPU VRM (Voltage Regulator Modules). 4. **Battery Powered Systems:** Where high efficiency and space-saving are critical. --- ### 4. Part Number Breakdown The nomenclature follows a specific logic: * **SD:** Series name (Shielded Drum Core). * **18:** Size code (refers to the 1.8mm height profile). * **R82:** Inductance value. The "R" acts as a decimal point ($0.82$).