## Technical Overview of SD7030-3R3-R The **SD7030-3R3-R** is a high-performance, shielded surface-mount (SMD) power inductor. It is part of the SD series manufactured by **Eaton (formerly Bussmann)**. These inductors are specifically designed for applications requiring high power density and electromagnetic interference (EMI) shielding. --- ### 1. Key Technical Specifications | Parameter | Specification | |:---|:---| | **Inductance** | 3.3 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 3.12 Amps | | **Saturation Current (Isat)** | 3.50 Amps | | **DC Resistance (DCR)** | 26.4 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically Shielded | | **Package Size** | 7.0mm x 7.0mm x 3.0mm | --- ### 2. Physical Construction and Features * **Shielded Design:** The core is enclosed in a magnetic shroud, which minimizes EMI and prevents the magnetic field from interfering with neighboring components on the PCB. * **Ferrite Core:** Utilizes a ferrite drum core and sleeve construction, providing high efficiency and low core losses. * **Low Profile:** With a height of only 3.0mm, it is ideal for thin electronic devices where vertical space is limited. * **Lead-Free/RoHS:** The "-R" suffix indicates that the part is fully RoHS compliant and uses lead-free terminations. --- ### 3. Common Applications The SD7030-3R3-R is primarily used in power management circuits where voltage needs to be stepped down or regulated. Common use cases include: 1. **DC-DC Converters:** Buck, boost, and buck-boost regulators. 2. **Portable Electronics:** Tablets, laptops, and handheld GPS units. 3. **Computer Peripherals:** Hard disk drives (HDD) and Solid State Drives (SSD). 4. **Battery Powered Systems:** Efficiency is critical in these systems, and the low DCR of this inductor helps extend battery life. --- ### 4. Part Number Breakdown The part number follows a specific nomenclature: * **SD:** Series name (Shielded Drum). * **7030:** Dimensions (approx. 7.0mm x 7.0mm x 3.0mm). * **3R3:** Inductance value (3.3 µH). The "R" acts as a decimal point. * **R:** RoHS compliant.