The **SD12-8R2-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is part of the SD series, known for its shielded construction and surface-mount (SMD) design. --- ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 8.2 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 114 mΩ (Typical) | | **Rated Current (Irms)** | 1.34 Amps | | **Saturation Current (Isat)** | 1.14 Amps | | **Shielding** | Magnetically Shielded | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 5.2mm x 5.2mm x 1.2mm | --- ### 2. Physical & Material Characteristics * **Magnetically Shielded:** The core is designed to contain magnetic flux. This is critical for high-density PCB layouts because it minimizes Electromagnetic Interference (EMI) with neighboring components. * **Low Profile:** With a height of only **1.2mm**, it is ideal for ultra-thin electronics like smartphones, tablets, and wearable sensors. * **Ferrite Core:** Utilizes a ferrite drum core and sleeve, providing high efficiency and low core losses at high frequencies. --- ### 3. Common Applications The SD12 series is primarily used in power management circuits where space is a premium and EMI must be controlled. 1. **DC-DC Converters:** Buck (step-down), Boost (step-up), and SEPIC topologies. 2. **Portable Electronics:** Used in mobile phones, digital cameras, and MP3 players. 3. **Computer Peripherals:** Found in hard disk drives (HDD) and solid-state drives (SSD) power rails. 4. **LED Drivers:** Providing stable current for backlighting in small displays. --- ### 4. Part Number Breakdown: `SD12-8R2-R` | Segment | Meaning | | :--- | :--- | | **SD** | Series Name (Shielded Drum) | | **12** | Size Dimensions (approx. 1.2mm height) | | **8R2** | Inductance Value (8.2 µH) | | **-R** | RoHS Compliant / Lead-Free | ---