The **DFE201210U-R47M** is a high-performance, miniature power inductor manufactured by **Murata Electronics**. It is part of the DFE201210U series, specifically designed for high-efficiency DC-DC conversion in space-constrained electronic devices. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify the physical and electrical characteristics: | Code Segment | Meaning | Specification | | :--- | :--- | :--- | | **DFE** | Series Name | Metal alloy core, low profile | | **2012** | Case Size (Metric) | 2.0mm x 1.25mm | | **10** | Height | 1.0mm (max) | | **U** | Design Code | Internal design reference | | **R47** | Inductance Value | 0.47 µH | | **M** | Tolerance | ±20% | --- ### 2. Technical Specifications Below are the primary electrical parameters for the R47M variant: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.47 µH | | **DC Resistance (DCR)** | 31 mΩ (Max) / 26 mΩ (Typ) | | **Rated Current (Isat)** | 4.4 A (based on 30% inductance drop) | | **Rated Current (Itemp)** | 3.6 A (based on 40°C temperature rise) | | **Operating Temperature** | -40°C to +125°C | | **Core Material** | Metal Alloy (Iron Powder) | --- ### 3. Key Features and Advantages * **Metal Alloy Construction:** Unlike traditional ferrite inductors, the metal alloy core allows for **soft saturation** characteristics. This means the inductance drops gradually rather than abruptly when the current increases. * **Magnetic Shielding:** The structure is naturally shielded, which minimizes Electromagnetic Interference (EMI) with surrounding components—crucial for dense PCB layouts. * **High Current Density:** Despite its small "0805" (2012 metric) footprint, it can handle significant current (up to 4.4A peak), making it ideal for power stages. * **Low DCR:** The low direct current resistance ensures minimal power loss through heat, extending battery life in portable devices. --- ### 4. Common Applications This specific inductor is typically found in the following circuits: 1. **Smartphone PMICs:** Used in buck converters for CPUs, GPUs, and high-speed memory. 2. **Wearable Tech:** Ideal for smartwatches and fitness trackers due to the 1.0mm ultra-low profile. 3. **Portable Medical Devices:** Where high reliability and small size are required. 4. **SSD Modules:** Used in the power management stage of Solid State Drives. ---