The **HCMA1305-R68-R** is a high-current power inductor designed specifically for automotive and industrial applications. It belongs to the HCMA series manufactured by Eaton (formerly Cooper Bussmann). ### Technical Specifications Below is a breakdown of the core electrical and physical characteristics: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.68 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 2.5 mΩ (Max) | | **Rated Current (Irms)** | 25 Amps | | **Saturation Current (Isat)** | 35 Amps | | **Operating Temperature** | -55°C to +155°C | | **Package Size** | 13.8mm x 12.5mm x 5.0mm | --- ### Key Features and Construction 1. **AEC-Q200 Qualified**: This part is automotive grade, meaning it has passed rigorous stress tests for vibration, thermal shock, and moisture resistance, making it suitable for under-the-hood electronics. 2. **Molded Construction**: It features a powdered iron core technology. The wire is molded directly into the magnetic material, which provides: * Excellent magnetic shielding (low EMI). * High resistance to "acoustic noise" (buzzing). * Soft saturation characteristics (it doesn't lose inductance abruptly when current spikes). 3. **Low DCR**: The 2.5 mΩ resistance is extremely low, which minimizes power loss and heat generation during high-current operation. ### Common Applications Due to its high current handling and ruggedness, it is typically used in: * **DC-DC Converters**: For voltage regulation in automotive ECUs. * **Filtering**: High-current noise suppression in power supplies. * **LED Lighting**: Power drivers for automotive headlamps. * **Industrial Computing**: High-density power modules for servers or motor controllers. --- ### Part Number Breakdown The nomenclature can be decoded as follows: | Segment | Meaning | | :--- | :--- | | **HCMA** | Product Series (High Current Automotive) | | **1305** | Case size (approx. 13mm x 5mm height) | | **R68** | Inductance value (R = decimal point; 0.68 µH) | | **-R** | RoHS Compliant |