The **DRAP127-R47-R** is a specific model of a high-power, shielded drum core inductor. It belongs to the **DRAP (Dual Realistic Automotive Power)** series manufactured by **Eaton (formerly Coiltronics)**. --- ### 1. Technical Specifications This component is designed for high-current applications where stability and EMI shielding are critical. | Parameter | Value / Description | | :--- | :--- | | **Inductance** | 0.47 µH (Microhenries) | | **Tolerance** | ±20% | | **DCR (DC Resistance)** | Approximately 1.95 mΩ (Nominal) | | **Irms (Root Mean Square Current)** | ~25.0 A (Typical temperature rise current) | | **Isat (Saturation Current)** | ~45.0 A (Typical current at 30% inductance drop) | | **Package / Case** | 12.5mm x 12.5mm x 8.0mm (Surface Mount) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Key Features * **Magnetically Shielded:** The part features a ferrite shield that minimizes Electromagnetic Interference (EMI), making it suitable for densely packed circuit boards. * **Dual Winding Capability:** The "DRAP" series often features two windings that can be connected in series or parallel, allowing for versatility in circuit design (though the R47 specifically refers to the resulting inductance). * **High Power Density:** Optimized for high-current carrying capacity relative to its physical footprint. * **Automotive Grade:** Often qualified under AEC-Q200 standards, meaning it can withstand the harsh vibrations and temperatures found in automotive environments. --- ### 3. Application Use Cases The DRAP127-R47-R is primarily used in power management circuits. 1. **DC-DC Converters:** Acts as an energy storage element in buck, boost, or SEPIC converters. 2. **Voltage Regulator Modules (VRMs):** Used in high-speed computing and servers to manage high current delivery to CPUs/GPUs. 3. **Automotive Electronics:** Powering infotainment systems, LED lighting drivers, and Advanced Driver Assistance Systems (ADAS). 4. **Industrial Power Supplies:** Filtering and smoothing output current in heavy-duty power bricks. --- ### 4. Part Number Breakdown * **DRAP:** Series Name (Dual Realistic Automotive Power). * **127:** Physical Size (approx. 12mm x 12mm; "7" indicates the height profile). * **R47:** Inductance value (R represents the decimal point: 0.47 µH). * **-R:** RoHS compliant (Lead-free).