## SD7030-3R9-R Technical Overview The **SD7030-3R9-R** is a high-performance, shielded surface-mount (SMD) power inductor. It is part of the SD7030 series manufactured by **Eaton (formerly Cooper Bussmann)**. These components are primarily used for power management and DC-DC conversion. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 3.9 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 3.2 Amps (Temperature rise base) | | **Saturation Current (Isat)** | 3.1 Amps (Inductance drop base) | | **DC Resistance (DCR)** | 27.5 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Ferrite Drum / Magnetically Shielded | --- ### 2. Physical Characteristics The "7030" in the part number refers to the physical dimensions of the package. * **Footprint:** Approximately 7.0mm x 7.0mm. * **Height:** 3.0mm (Low profile). * **Construction:** It features a ferrite core with a magnetic shield to minimize Electromagnetic Interference (EMI), making it suitable for high-density boards. --- ### 3. Component Functionality As a power inductor, the SD7030-3R9-R performs three main roles in an electronic circuit: 1. **Energy Storage:** In switching regulators (Buck/Boost converters), it stores energy in its magnetic field during the "ON" cycle and releases it during the "OFF" cycle. 2. **Filtering:** It acts as a low-pass filter, smoothing out ripples in current to provide a steady DC output. 3. **EMI Suppression:** Because it is magnetically shielded, it prevents magnetic flux from leaking and interfering with nearby sensitive components. --- ### 4. Common Applications * **Mobile Computing:** Laptops, tablets, and handheld GPS units. * **DC-DC Converters:** Point-of-Load (POL) modules for CPUs and FPGAs. * **Battery Powered Devices:** Due to its low DCR, it helps maximize battery life by reducing power loss. * **LED Drivers:** Providing stable current for high-brightness LEDs. --- ### 5. Part Number Breakdown ```text SD 7030 - 3R9 - R | | | | | | | |__ RoHS Compliant | | |________ Inductance Value (3.9 µH; R = decimal point) | |________________ Size Code (7.0 x 7.0 x 3.0 mm) |______________________ Series Name (Shielded Drum Inductor) ```