The **HCM1A0503-R35-R** is a high-current power inductor designed by Eaton (formerly Cooper Bussmann). It is specifically engineered for automotive and high-reliability industrial applications. ### 1. Technical Specifications The following table highlights the core electrical and physical characteristics of the component: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.35 µH (Microhenries) | | **Tolerance** | ±20% | | **Rated Current ($I_{rms}$)** | 16.0 A (Amperes) | | **Saturation Current ($I_{sat}$)** | 22.0 A (Amperes) | | **DC Resistance (DCR)** | 4.1 mΩ (typical) | | **Operating Temperature** | -55°C to +155°C | | **AEC-Q200 Qualified** | Yes (Automotive Grade) | | **Dimensions (L x W x H)** | 5.5mm x 5.25mm x 3.0mm | --- ### 2. Physical Construction The "HCM1A" series uses a specific construction method to handle harsh environments: * **Molded Powder Core:** The inductor is made from a pressed iron powder material. This design provides "soft saturation" characteristics, meaning the inductance drops gradually rather than abruptly as current increases. * **Shielded Design:** The molded construction naturally provides magnetic shielding, which minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. * **Lead-frame termination:** This ensures high mechanical stability against vibration and thermal shock. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **HCM1A**: Series name (High Current Automotive Grade). * **0503**: Size code (approx. 5.5mm x 5.3mm footprint, 3.0mm height). * **R35**: Inductance value (R35 = 0.35 µH). * **-R**: RoHS compliant. --- ### 4. Typical Applications Due to its high temperature rating and current handling, it is commonly used in: 1. **Automotive Electronics:** Advanced Driver Assistance Systems (ADAS), infotainment, and engine control units (ECUs). 2. **DC-DC Converters:** Voltage regulator modules (VRMs) for high-efficiency power supplies. 3. **Industrial Systems:** Distributed power systems and high-current point-of-load (POL) converters.