The **SD3812-8R2-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It is part of the SD3812 series, designed for space-constrained electronic applications. ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 8.2 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 0.134 Ω (Typical) | | **Saturation Current (Isat)** | 1.10 A | | **RMS Current (Irms)** | 1.14 A | | **Shielding** | Shielded (Magnetic) | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Characteristics The part number itself reveals the physical dimensions of the component: * **SD38**: Indicates the series family. * **12**: Represents the maximum height of the component (**1.2 mm**). * **8R2**: Represents the inductance value (8.2 µH). * **R**: Indicates compliance with RoHS standards. **Dimensions:** 4.0 mm x 4.0 mm x 1.2 mm. --- ### 3. Core Features and Benefits * **Magnetic Shielding:** The inductor is magnetically shielded, which minimizes Electromagnetic Interference (EMI). This is critical for dense PCB layouts where components are close to sensitive analog circuits. * **Low Profile:** At only 1.2mm tall, it is ideal for "thin" electronics like smartphones, tablets, and wearable tech. * **Ferrite Core:** Utilizes a ferrite core material which provides high efficiency and low core losses at high frequencies. * **High Power Density:** Despite its small footprint, it handles relatively high current (over 1 Amp) compared to its size. --- ### 4. Typical Applications The SD3812-8R2-R is commonly used in DC-DC converter circuits. Specific use cases include: 1. **Buck/Boost Converters:** Voltage regulation in portable handheld devices. 2. **LCD Displays:** Powering the backlight or driver circuitry. 3. **LED Drivers:** Providing stable current for high-brightness LEDs. 4. **Computer Peripherals:** Used in SSDs, network cards, and compact motherboard components. --- ### 5. Equivalent/Alternative Parts If this specific part is unavailable, engineers often look for these alternatives with similar footprints: * **Bourns:** SRN4012 series * **TDK:** VLS4012 series * **Taiyo Yuden:** NR4012 series