## SD3812-2R2-R Electronic Component Overview The **SD3812-2R2-R** is a low-profile, shielded surface-mount (SMD) power inductor. It is manufactured by **Eaton (formerly Bussmann)** as part of the SD38 series. These inductors are specifically designed for high-density applications where vertical space is limited. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 2.2 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.053 Ω (Max) | | **Saturation Current ($I_{sat}$)** | 1.83 A | | **RMS Current ($I_{rms}$)** | 1.63 A | | **Operating Temperature** | -40°C to +125°C | | **Dimensions (L x W x H)** | 4.0mm x 4.0mm x 1.2mm | --- ### 2. Physical Construction and Features * **Shielding:** It features a ferrite drum core with a ferrite sleeve (magnetic shielding). This minimizes Electromagnetic Interference (EMI) and prevents magnetic flux from affecting nearby components. * **Low Profile:** With a maximum height of only **1.2 mm**, it is ideal for thin consumer electronics. * **Materials:** Lead-free, halogen-free, and RoHS compliant. * **Tape and Reel:** The "-R" suffix indicates that the part is supplied on a carrier tape for automated pick-and-place assembly. --- ### 3. Common Applications The SD3812-2R2-R is primarily used in DC-DC converters and power management circuits for: 1. **Mobile Devices:** Smartphones, tablets, and handheld gaming consoles. 2. **Wearables:** Smartwatches and fitness trackers where space is at a premium. 3. **Computers:** Digital cameras, hard disk drives (HDD), and solid-state drives (SSD). 4. **IoT Devices:** Low-power wireless sensors requiring efficient power conversion. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **SD** | Series Prefix (Shielded Drum Inductor) | | **3812** | Size Dimensions (~3.8mm wide, 1.2mm high) | | **2R2** | Inductance Value (2.2 µH - "R" acts as decimal) | | **-R** | RoHS Compliant / Tape and Reel packaging | ---