The **HCM1A1305V2-R33-R** is a high-current, automotive-grade power inductor manufactured by **Eaton (formerly Bussmann)**. It is specifically designed to meet the rigorous demands of automotive electronics, focusing on high power density and thermal stability. --- ### 1. Technical Specifications The following table highlights the primary electrical and physical characteristics of this component: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 0.33 µH | | **Tolerance** | ±20% | | **Current Rating (Irms)** | 42.0 Amperes | | **Saturation Current (Isat)** | 62.0 Amperes | | **DC Resistance (DCR)** | 0.95 mΩ (Max) | | **Operating Temperature** | -55°C to +155°C | | **Package Size** | 13.8mm x 12.5mm x 5.0mm | | **AEC-Q200 Qualified** | Yes (Grade 1) | --- ### 2. Core Features and Construction * **Molded Construction:** The inductor uses a metal powder molding technology. This provides a "soft saturation" characteristic, meaning the inductance drops gradually as current increases, rather than dropping sharply. * **Magnetically Shielded:** The molded body acts as a natural shield, significantly reducing Electromagnetic Interference (EMI) which is critical in sensitive automotive circuits. * **Low DCR:** With a maximum resistance of only 0.95 mΩ, this part minimizes power loss due to heat, leading to higher efficiency in power conversion. * **High Thermal Stability:** The V2 series is enhanced for higher temperature reliability, rated for operation up to 155°C (ambient + self-heating). --- ### 3. Application Use-Cases This component is typically found in the following electronic systems: 1. **Automotive DC-DC Converters:** Used in Point-of-Load (POL) converters for Engine Control Units (ECUs). 2. **Infotainment & ADAS:** Powering high-speed processors for cameras and dashboard displays. 3. **LED Lighting:** Used in the driver circuitry for high-intensity headlights. 4. **Industrial Computing:** High-current power supplies for servers or industrial motor controllers. --- ### 4. Part Number Breakdown The part number follows a specific nomenclature: * **HCM1A**: Series identifier (Automotive high current molded). * **1305**: Physical dimensions (approx. 13mm x 5mm height). * **V2**: Version 2 (Improved thermal/performance rating). * **R33**: Inductance value (R33 = 0.33 µH). * **-R**: RoHS compliant.