## Technical Overview of DFE201208S-R47M The **DFE201208S-R47M** is a high-performance, miniature fixed inductor manufactured by **Murata Electronics**. It belongs to the DFE series, which utilizes a metal alloy core material designed for high-current power circuits, particularly in space-constrained mobile electronics. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 27 mΩ (Max) / 21 mΩ (Typ) | | **Rated Current (Isat)** | 4.4 A (based on Inductance change) | | **Rated Current (Itemp)** | 3.5 A (based on Temperature rise) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | 0805 (2012 Metric) | | **Dimensions (L x W x H)** | 2.0 x 1.2 x 0.8 mm | --- ### 2. Core Features and Construction * **Metal Alloy Technology:** Unlike traditional ferrite inductors, this part uses a metal powder core. This allows for **Soft Saturation** characteristics, meaning the inductance drops gradually as current increases rather than dropping off sharply. * **Low Profile:** With a height of only 0.8 mm, it is ideal for ultra-thin devices like smartphones, tablets, and wearable tech. * **Magnetic Shielding:** The structure is naturally shielded due to the resin-molded metal powder, which reduces Electromagnetic Interference (EMI) with surrounding components. * **High Current Density:** Despite its small footprint (2.0mm x 1.2mm), it can handle significant current (up to 4.4A saturation), making it efficient for DC-DC converter applications. --- ### 3. Common Applications 1. **DC-DC Converters:** Used as a power inductor in switching regulators to smooth out current. 2. **Mobile Devices:** Power management modules (PMICs) for smartphones and portable gaming consoles. 3. **CPU/GPU Power Supply:** Providing stable voltage rails for low-power processors. 4. **IoT Modules:** Compact wireless sensors requiring high efficiency in a small form factor. --- ### 4. Part Number Breakdown The nomenclature follows Murata's standard coding for metal alloy inductors: * **DFE**: Series Name (Metal Alloy Inductor) * **2012**: Dimensions (2.0mm x 1.2mm) * **08**: Height (0.8mm) * **S**: Manufacturing Process code * **R47**: Inductance Value (R47 = 0.47µH) * **M**: Tolerance (M = ±20%)