The **SD7030-331-R** is a high-performance, shielded surface-mount (SMD) power inductor. It is part of the SD7030 series manufactured by Eaton (formerly Bussmann/Coiltronics). These components are primarily used for power management and DC-DC conversion. --- ### 1. Technical Specifications The part number "331" indicates the inductance value, while the "R" signifies RoHS compliance. | Parameter | Value | | :--- | :--- | | **Inductance** | 330 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 1.15 Ω (Typical) | | **Rated Current (Irms)** | 0.44 Amps | | **Saturation Current (Isat)** | 0.52 Amps | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Ferrite Drum Core (Magnetically Shielded) | --- ### 2. Physical Dimensions The SD7030 series is named after its footprint size (approximately 7.0mm x 7.0mm x 3.0mm). | Dimension | Measurement (mm) | | :--- | :--- | | **Length** | 7.0 mm | | **Width** | 7.0 mm | | **Height** | 3.0 mm | --- ### 3. Key Electronic Functions * **Energy Storage:** It stores energy in a magnetic field during the "on" cycle of a switching regulator and releases it during the "off" cycle. * **EMI Suppression:** Because it is **magnetically shielded**, it minimizes Electromagnetic Interference (EMI), preventing the inductor's magnetic field from affecting nearby sensitive components on the PCB. * **Filtering:** It acts as a low-pass filter, smoothing out high-frequency ripples in power supplies to provide a steady DC voltage. ### 4. Common Applications * **DC-DC Converters:** Used in buck (step-down) or boost (step-up) converters. * **Battery Powered Devices:** Ideal for laptops, handheld instruments, and IoT sensors due to its low profile. * **LED Drivers:** Provides constant current regulation for lighting applications. * **Computer Peripherals:** Used in SSDs, motherboards, and graphic cards for local voltage regulation. --- ### 5. Part Number Breakdown The naming convention follows a specific logic: * **SD:** Series name (Shielded Drum). * **7030:** Dimensions (7.0mm x 3.0mm height). * **331:** Inductance code ($33 \times 10^1 = 330$ µH). * **R:** RoHS compliant.