The **HCM0503-220-R** is a high-current, power inductor manufactured by **Eaton (formerly Coiltronics)**. It is part of the HCM series designed for high-density power conversion applications where efficiency and thermal management are critical. --- ## 1. Technical Specifications Below are the key electrical and physical parameters for this specific part number: | Parameter | Specification | | :--- | :--- | | **Inductance** | 22.0 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 128 mΩ (Typical) / 152 mΩ (Maximum) | | **Rated Current ($I_{rms}$)** | 2.3 Amps (Typical) | | **Saturation Current ($I_{sat}$)** | 3.5 Amps (Typical) | | **Operating Temperature** | -50°C to +125°C | | **Core Material** | Iron Powder (High-frequency, low loss) | | **Package Size** | 5.5mm x 5.3mm x 3.0mm (0503) | --- ## 2. Key Features * **High Current Handling:** Designed to handle significant current relative to its small surface-mount footprint. * **Magnetically Shielded:** The molded construction minimizes Electromagnetic Interference (EMI), which is vital for compact electronic assemblies. * **Low Core Loss:** The iron powder core provides stable performance across a wide frequency range with minimal energy wasted as heat. * **Environmental Compliance:** It is RoHS compliant and halogen-free. --- ## 3. Part Number Breakdown Understanding the nomenclature helps in identifying variations of the component: | Segment | Meaning | | :--- | :--- | | **HCM** | Series Name (High Current Inductor) | | **0503** | Physical Size (approx. 5.5 x 5.3 x 3.0 mm) | | **220** | Inductance Value (22 followed by 0 zeros = **22 µH**) | | **-R** | RoHS Compliant | --- ## 4. Typical Applications The HCM0503-220-R is commonly used in DC-DC converters and power modules for: * **Computing:** Laptops, servers, and desktop motherboards. * **Networking:** Routers, switches, and base stations. * **Industrial:** Power supplies for automation and control systems. * **Battery Powered Devices:** Handheld electronics requiring efficient voltage regulation. --- ## 5. Design Considerations * **Saturation:** Ensure the peak current in your circuit does not exceed the $I_{sat}$ (3.5A) to avoid a sharp drop in inductance. * **Thermal Management:** The $I_{rms}$ rating is based on a 40°C temperature rise. In enclosed or high-ambient environments, derating may be necessary.