The **HCM1A1305-R47-R** is a high-current, automotive-grade power inductor manufactured by **Eaton (formerly Cooper Bussmann)**. It is part of the HCM1A series, designed to meet the rigorous demands of automotive environments. --- ### 1. General Specifications | Feature | Specification | | :--- | :--- | | **Inductance** | 0.47 µH | | **Tolerance** | ±20% | | **DCR (DC Resistance)** | 1.1 mΩ (typical) / 1.3 mΩ (max) | | **Irms (Rated Current)** | 42 Amperes | | **Isat (Saturation Current)** | 65 Amperes | | **Operating Temperature** | -55°C to +155°C | | **AEC-Q200 Qualified** | Yes (Grade 1) | --- ### 2. Key Characteristics The device is engineered for high-performance power conversion. Its internal construction and material choice provide several advantages: * **Molded Construction:** The inductor uses a powdered iron core technology that is molded around the winding. This provides excellent shielding against Electromagnetic Interference (EMI) and reduces acoustic noise. * **High Saturation:** It handles high peak currents without the inductance dropping off sharply (soft saturation), which is critical for stable voltage regulation. * **Thermal Robustness:** Rated for Grade 1 automotive use, it can operate in extreme heat (up to 155°C ambient + self-heating). * **Low DCR:** The extremely low DC resistance (1.1mΩ) minimizes power loss and improves overall circuit efficiency. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Prefix | Series/Size | Height | Value Code | Packaging | | :--- | :--- | :--- | :--- | :--- | | **HCM1A** | Automotive Series | **1305** | **R47** | **-R** | | High Current Molded | ~13mm x 13mm footprint | 5.0mm Max | 0.47 microhenries | RoHS Compliant | --- ### 4. Typical Applications Due to its high current capability and reliability, it is commonly found in: * **Automotive Systems:** Advanced Driver Assistance Systems (ADAS), Body electronics, Infotainment, and LED lighting. * **DC-DC Converters:** Multi-phase regulators and Point-of-Load (POL) modules. * **Industrial:** High-current power supplies and battery-powered systems. ---