## Technical Overview of SD3112-151-R The **SD3112-151-R** is a high-performance, low-profile power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the SD3112 series, which is specifically designed for space-constrained applications requiring high efficiency. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the component: | Parameter | Value | | :--- | :--- | | **Inductance** | 150 $\mu$H | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 4.80 $\Omega$ (Typical) | | **Saturation Current ($I_{sat}$)** | 0.165 A (165 mA) | | **RMS Current ($I_{rms}$)** | 0.222 A (222 mA) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 3.1mm x 3.1mm x 1.2mm | | **Shielding** | Magnetically Shielded | --- ### 2. Core Features * **Magnetic Shielding:** The part is magnetically shielded, which minimizes Electromagnetic Interference (EMI). This is critical for dense PCB layouts where components are placed close to sensitive analog circuits. * **Low Profile:** With a maximum height of only 1.2mm, it is ideal for ultra-thin electronics like smartphones, wearables, and tablets. * **Ferrite Core Construction:** Provides high saturation current and low core losses at high frequencies. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets RoHS environmental standards. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **SD:** Series name (Shielded Drum). * **3112:** Dimensions (3.1mm width/length, 1.2mm height). * **151:** Inductance code. The first two digits are significant figures, the third is the multiplier (15 + one zero = 150 $\mu$H). * **R:** RoHS compliant. --- ### 4. Common Applications Due to its small footprint and electrical properties, the SD3112-151-R is commonly found in: 1. **DC-DC Converters:** Used as a storage element in buck, boost, or SEPIC converters. 2. **LED Drivers:** Providing constant current for backlight displays. 3. **Battery Powered Devices:** Optimized for low power loss to extend battery life. 4. **Handheld Electronics:** GPS units, digital cameras, and smartwatches. --- ### 5. Land Pattern (Footprint) Example ```text 3.1mm +---------+ | [PAD] | | | 3.1mm | [PAD] | +---------+ Height: 1.2mm ``` ---