The **HCM0503-R35-R** is a high-current, automotive-grade power inductor manufactured by **Eaton (formerly Bussmann)**. It is part of the HCM series, known for high current-carrying capacity and low core losses. --- ### 1. Technical Specifications The part number "R35" denotes the inductance value, and "0503" refers to the physical dimensions. | Feature | Specification | | :--- | :--- | | **Inductance** | 0.35 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | 16.0 Amps | | **Saturation Current (Isat)** | 23.0 Amps | | **DC Resistance (DCR)** | 4.3 mΩ (Max) | | **Operating Temperature** | -55°C to +125°C | | **Package / Case** | 5.5mm x 5.3mm x 3.0mm | --- ### 2. Physical Construction The HCM0503 series utilizes advanced materials to ensure stability under harsh electrical conditions: * **Core Material:** Iron powder core. This provides a "soft saturation" characteristic, meaning the inductance drops gradually rather than abruptly when current increases. * **Shielding:** Magnetically shielded construction. This minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. * **Terminations:** Lead-free, halogen-free, and RoHS compliant. --- ### 3. Key Applications Because of its high current rating and small footprint, the HCM0503-R35-R is typically found in: 1. **Voltage Regulator Modules (VRM):** Used in high-speed point-of-load (POL) converters. 2. **Automotive Electronics:** Powering infotainment, LED lighting, and Advanced Driver Assistance Systems (ADAS) (AEC-Q200 Grade 1 qualified). 3. **DC-DC Converters:** Buck, boost, and forward converters in industrial equipment. 4. **Distributed Power Systems:** Managing power distribution in servers and telecommunications. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in selecting alternatives: | Segment | Meaning | | :--- | :--- | | **HCM** | Product Series (High Current Inductor) | | **0503** | Size Code (approx. 5x5mm footprint, 3mm height) | | **R35** | Inductance Value (R denotes decimal: 0.35 µH) | | **-R** | RoHS Compliant |