The **HCM1104-R90-R** is a high-current, shielded power inductor designed by Eaton (formerly Cooper Bussmann). It belongs to the HCM series, which is specifically engineered to handle high current ripples and provide low core losses in power conversion circuits. ### 1. Technical Specifications The following table summarizes the key electrical and physical characteristics of the HCM1104-R90-R: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.90 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 22 Amps | | **Saturation Current (Isat)** | 26 Amps | | **DC Resistance (DCR)** | 2.5 mΩ (Typical) | | **Operating Temperature** | -55°C to +125°C | | **Package Size** | 11.5mm x 10.3mm x 4.0mm | | **Shielding** | Magnetically Shielded (Low EMI) | --- ### 2. Key Features and Construction * **High Current Density:** The "R90" (0.90 µH) variant is optimized for high-frequency DC-DC converters where high efficiency and high current throughput are required. * **Magnetically Shielded:** The part is housed in a molded iron powder core. This design minimizes Electromagnetic Interference (EMI), making it safe for use near sensitive components. * **Low DCR:** The very low Direct Current Resistance (2.5 mΩ) minimizes power loss due to heat (I²R losses), contributing to higher overall system efficiency. * **SMD Design:** It is a Surface Mount Device (SMD) compatible with automated "pick and place" assembly and lead-free reflow soldering. --- ### 3. Common Applications This inductor is typically found in power management stages of high-performance electronics: * **Voltage Regulator Modules (VRMs):** Used in CPU and GPU power supplies on motherboards. * **DC-DC Converters:** Buck, boost, and forward converters. * **Distributed Power Systems:** Found in servers, base stations, and networking equipment. * **Battery Powered Systems:** Where thermal efficiency is critical to extending battery life. --- ### 4. Part Number Breakdown The part number follows a specific nomenclature: * **HCM:** Series name (High Current Inductor). * **1104:** Physical size (Approx. 11mm x 10mm x 4mm). * **R90:** Inductance value (R represents the decimal point; 0.90 µH). * **R:** RoHS compliant.