The **HCF1007-3R3-R** is a high-current, shielded drum core power inductor manufactured by Eaton (formerly Bussmann). It is specifically designed for high-density power applications where space and efficiency are critical. --- ### 1. Key Technical Specifications The part number itself reveals several key characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 3.3 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 9.0 mΩ (Typical) / 10.8 mΩ (Maximum) | | **Rated Current (Irms)** | 11.5 Amperes | | **Saturation Current (Isat)** | 14.5 Amperes | | **Operating Temp Range** | -40°C to +125°C | | **Package Size** | 10.3mm x 7.0mm x 6.7mm | --- ### 2. Physical Construction The "HCF" series stands for **High Current Ferrite**. The construction details are vital for its performance: * **Shielded Design:** It features a magnetic shield to minimize Electromagnetic Interference (EMI), which is crucial for sensitive electronics nearby. * **Surface Mount Device (SMD):** Designed for automated pick-and-place assembly on PCBs. * **Ferrite Core:** Utilizes a ferrite material that provides high efficiency and low core losses at high frequencies. --- ### 3. Applications and Usage This specific inductor (3.3 µH at high current) is typically found in: * **DC-DC Converters:** Used as an energy storage element in buck, boost, or SEPIC converters. * **Voltage Regulator Modules (VRMs):** Found in computing power supplies and servers. * **Industrial Electronics:** Used in high-power LED drivers and motor control circuits. * **Telecommunications:** Distributed power systems and base station equipment. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **HCF:** Product series (High Current Ferrite). * **1007:** Dimensions (approx. 10mm x 7mm). * **3R3:** Inductance value (3.3 µH; "R" acts as the decimal point). * **-R:** RoHS compliant / Green material.