## Technical Overview: SD18-R82-R Inductor The **SD18-R82-R** is a high-performance, low-profile **Power Inductor** manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It belongs to the **SD18 Series**, which is designed for applications requiring compact magnetic components with high power density. --- ### 1. Key Specifications Below are the primary electrical and physical characteristics of the SD18-R82-R: | Parameter | Value | Details | | :--- | :--- | :--- | | **Inductance** | 0.82 µH | Nominal inductance at 100 kHz | | **Tolerance** | ±20% | Standard manufacturing variance | | **Rated Current ($I_{rms}$)** | 4.36 Amps | Maximum continuous current (40°C rise) | | **Saturation Current ($I_{sat}$)** | 6.08 Amps | Current at which inductance drops by 30% | | **DC Resistance (DCR)** | 0.0162 $\Omega$ | Typical internal resistance at 20°C | | **Shielding** | Shielded | Ferrite drum core with magnetic epoxy | | **Footprint Size** | 5.2mm x 5.2mm | Square surface mount base | | **Height** | 1.8mm | Low profile design | --- ### 2. Core Features * **Magnetic Shielding:** The part is magnetically shielded, which minimizes Electromagnetic Interference (EMI). This makes it suitable for densely packed PCB layouts where cross-talk between components must be avoided. * **High Power Density:** Despite its small 1.8mm height, it handles relatively high current (over 4 Amps), making it ideal for modern slim electronics. * **Ferrite Core Material:** Uses a ferrite core which provides low core losses, ensuring high efficiency in high-frequency switching applications. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS standards. --- ### 3. Common Applications The SD18-R82-R is typically used in the following circuits: 1. **DC-DC Converters:** Specifically Buck, Boost, and SEPIC converters. 2. **Portable Electronics:** Smartphones, tablets, and wearable devices where vertical space is limited. 3. **Computer Peripherals:** Used in SSDs (Solid State Drives) and high-speed network cards. 4. **LCD Displays:** Voltage regulation for LED backlighting and panel drivers. --- ### 4. Interpretation of Part Number The part number can be broken down as follows: * **SD:** Series name (Shielded Drum). * **18:** Dimensional code (approx. 5.2mm x 1.8mm). * **R82:** Inductance value (R = decimal point, so 0.82 µH). * **-R:** RoHS compliant.