The **FP0705R1-R12-R** is a high-current, shielded drum core inductor designed specifically for high-frequency power conversion. It is part of the FP0705R series, widely used in Voltage Regulator Modules (VRMs) and DC-DC converters. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 120 nH (0.12 µH) | | **Tolerance** | ±10% | | **DCR (Direct Current Resistance)** | 0.25 mΩ (Nominal) | | **Rated Current ($I_{rms}$)** | 43 A | | **Saturation Current ($I_{sat}$)** | 58 A (at 25°C) | | **Operating Temperature** | -40°C to +125°C | | **Package Size** | 7.0 x 7.0 x 4.95 mm | --- ### 2. Breakdown of the Part Number The alphanumeric code provides specific details about the component's construction: * **FP0705**: The Series and Size code (Approx. 7.0mm footprint). * **R1**: Revision or internal designator for the winding style. * **R12**: The Inductance value. "R" acts as the decimal point ($R12 = 0.12 \mu H$). * **-R**: RoHS compliant (lead-free). --- ### 3. Core Features & Benefits * **High Current Density:** Capable of handling peaks up to 58 Amps, making it ideal for modern CPUs and GPUs that require high transient currents. * **Ultra-Low DCR:** The 0.25 mΩ resistance minimizes power loss due to heat (Jule heating), ensuring high efficiency in power delivery. * **Magnetic Shielding:** The design reduces Electromagnetic Interference (EMI), preventing the inductor from interfering with nearby sensitive components on the PCB. * **Ferrite Core Material:** Optimized for high-frequency switching (up to several MHz), which allows for smaller filter capacitors in the circuit. --- ### 4. Typical Applications 1. **Multi-phase VRMs:** Used in servers and workstations to power processors. 2. **Point-of-Load (POL) Converters:** Efficiently stepping down voltage near the load. 3. **Graphics Cards:** High-end GPUs require these inductors for stable power delivery under heavy loads. 4. **Data Centers:** High-density power modules where space is a premium. ---