## HCM1305-R68-R: Technical Overview The **HCM1305-R68-R** is a high-current, automotive-grade power inductor manufactured by **Eaton (formerly Coiltronics)**. It is part of the HCM series, specifically designed to handle high power densities in a compact surface-mount package. ### 1. Key Technical Specifications | Parameter | Value | | :--- | :--- | | **Inductance** | 0.68 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | 2.5 mΩ (Nominal) | | **Rated Current (Irms)** | 28.0 A | | **Saturation Current (Isat)** | 35.0 A | | **Operating Temperature** | -55°C to +125°C | | **Package Size** | 13.8mm x 12.5mm x 5.0mm | --- ### 2. Component Composition and Design The HCM1305 series utilizes advanced materials to maintain efficiency under high thermal stress: * **Core Material:** Iron powder core technology. This provides "soft" saturation characteristics, meaning the inductance drops gradually as current increases rather than crashing abruptly. * **Shielding:** It is **magnetically shielded**, which minimizes Electromagnetic Interference (EMI) with surrounding components on the PCB. * **Construction:** It features a molded construction that provides high resistance to shock and vibration, making it ideal for harsh environments. --- ### 3. Part Number Breakdown Understanding the nomenclature helps in identifying variants: | Segment | Meaning | | :--- | :--- | | **HCM** | Product Series (High Current Inductor) | | **1305** | Dimensions (Approx. 13mm width, 5mm height) | | **R68** | Inductance Value (R68 = 0.68 µH) | | **-R** | RoHS Compliant / Lead-Free | --- ### 4. Common Applications Due to its high current rating and low DCR, the HCM1305-R68-R is typically found in: * **DC-DC Converters:** Used as the main storage inductor in buck/boost regulators. * **Voltage Regulator Modules (VRMs):** Powering CPUs and GPUs in industrial computers. * **Automotive Electronics:** Powering Advanced Driver Assistance Systems (ADAS) or infotainment systems (AEC-Q200 grade versions are available). * **Point-of-Load (POL) Converters:** Providing stable power for high-speed FPGAs and ASICs. --- ### 5. Footprint (Mechanical Data) ```text Dimensions (mm): L: 13.4 - 13.8 W: 12.5 - 12.9 H: 5.0 (Max) ```