## HCM1307-3R3-R: High Current Power Inductor The **HCM1307-3R3-R** is a high-performance, high-current power inductor manufactured by Eaton (formerly Cooper Bussmann). It belongs to the HCM series, which is specifically designed for high-density power applications where space is limited and efficiency is critical. --- ### 1. Key Technical Specifications The part number follows a specific nomenclature. In this case, **3R3** represents the inductance value of **3.3 µH**. | Parameter | Specification | | :--- | :--- | | **Inductance** | 3.3 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 13.0 Amperes | | **Saturation Current (Isat)** | 15.0 Amperes | | **DC Resistance (DCR)** | 8.2 mΩ (Typical) | | **Operating Temp Range** | -55°C to +125°C | | **Package Type** | Surface Mount (SMD) | | **Dimensions** | ~13.8mm x 12.5mm x 6.5mm | --- ### 2. Physical Construction and Features The "1307" in the part number refers to the physical footprint size (approximately 13mm width and 7mm height). * **Molded Construction:** The inductor uses a powder iron core material that is molded around the winding. This provides excellent magnetic shielding and reduces EMI (Electromagnetic Interference). * **High Current Density:** The flat wire or robust internal structure allows it to handle large amounts of current with minimal self-heating. * **Low Core Loss:** Optimized for high-frequency switching, reducing power waste in DC-DC converters. * **Lead-Free/RoHS Compliant:** The "-R" suffix indicates compliance with environmental standards and a matte tin lead finish. --- ### 3. Common Applications This specific component is typically found in the power stages of high-performance electronics: 1. **Voltage Regulator Modules (VRMs):** Used in servers and workstations to provide stable power to CPUs and GPUs. 2. **DC-DC Converters:** Found in point-of-load (POL) power supplies for telecommunications. 3. **Industrial Systems:** High-current power supplies for motor control or automation. 4. **Battery Powered Systems:** Where low DCR is necessary to maximize battery life. --- ### 4. Comparison: Irms vs. Isat When integrating this part into a circuit, it is vital to distinguish between its two current ratings: * **Irms (13.0A):** This is the continuous current that will cause the component's temperature to rise by roughly 40°C. * **Isat (15.0A):** This is the peak current at which the inductance value drops by 20% due to magnetic saturation.