The **1276AS-H-R47M** is a high-performance, surface-mount (SMD) power inductor commonly used in DC-DC converter applications. It belongs to the **DFE322512C** series manufactured by **Murata Electronics**. --- ### Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 21 mΩ (Max) | | **Rated Current (Isat)** | 5.3 A (Based on Inductance change) | | **Rated Current (Itemp)** | 4.3 A (Based on Temperature rise) | | **Case Size (Metric)** | 3225 (3.2mm x 2.5mm) | | **Height** | 1.2 mm (Max) | | **Core Material** | Metal Alloy | --- ### Key Features and Construction 1. **Metal Alloy Core**: Unlike traditional ferrite inductors, this part uses a metal alloy powder core. This provides **soft saturation characteristics**, meaning the inductance drops gradually as current increases rather than dropping off sharply. 2. **Magnetic Shielding**: The construction is naturally shielded, which minimizes electromagnetic interference (EMI) with surrounding components on the PCB. 3. **Low Profile**: With a maximum height of 1.2mm, it is ideal for ultra-thin electronics like smartphones and tablets. 4. **High Current Capability**: Despite its small footprint, the metal alloy allows it to handle high saturation currents. --- ### Common Applications * **Mobile Devices**: Smartphones, tablets, and wearable tech. * **Voltage Regulator Modules (VRM)**: Used in point-of-load (POL) power supplies. * **DC-DC Converters**: Ideal for high-frequency switching regulators. * **Compact Consumer Electronics**: Digital cameras and portable gaming consoles. --- ### Part Number Breakdown * **1276AS**: Series designation (specific to Murata’s internal manufacturing code for DFE322512C). * **H**: Internal code for specific material/process characteristics. * **R47**: Represents the inductance value. "R" acts as the decimal point ($0.47$). * **M**: Tolerance code ($M = \pm 20\%$).