### HCF1305-R47-R Technical Overview The **HCF1305-R47-R** is a high-current, shielded power inductor designed by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the HCF1305 series, which is characterized by its surface-mount (SMD) design and high power density. --- ### Key Specifications | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.47 µH (Microhenries) | | **Inductance Tolerance** | ±20% | | **Current Rating (Irms)** | ~32 Amperes (Temperature rise dependent) | | **Saturation Current (Isat)** | ~55 Amperes (Inductance drop dependent) | | **DC Resistance (DCR)** | ~0.78 mΩ (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Shielding** | Magnetically shielded (Ferrite core) | | **Mounting Type** | Surface Mount (SMD/SMT) | --- ### Core Construction and Features 1. **Ferrite Core Material:** The "HCF" stands for High-Current Ferrite. The core material is chosen for low core losses at high frequencies, making it efficient for modern power conversion. 2. **Flat-Wire Winding:** This component often utilizes flat copper wire rather than round wire. This increases the surface area and reduces the DC resistance (DCR), allowing the part to handle extremely high currents without overheating. 3. **Magnetic Shielding:** The inductor is enclosed in a magnetic cage. This minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB, which is critical in dense electronic layouts. 4. **Footprint:** The "1305" designation refers to the physical dimensions (approximately 13mm x 13mm base, with a 5mm height). --- ### Applications The HCF1305-R47-R is primarily used in power regulation circuits where high efficiency and high current handling are required: * **Multi-phase Regulators:** Common in CPU and GPU power delivery (Vcore). * **Voltage Regulator Modules (VRMs):** Used in servers and workstations. * **DC-DC Converters:** Point-of-Load (POL) modules for industrial and telecommunications equipment. * **Battery Powered Systems:** Where low DCR is required to preserve battery life by reducing heat loss ($P = I^2 R$). --- ### Part Number Breakdown | Component | Meaning | | :--- | :--- | | **HCF** | High-Current Ferrite Series | | **1305** | Case size (approx. 13.0 x 12.8 x 5.0 mm) | | **R47** | Inductance value (R = decimal point; 0.47 µH) | | **-R** | RoHS compliant / Lead-free |