## HCF1305-4R0-R: Component Overview The **HCF1305-4R0-R** is a high-current, high-frequency, shielded power inductor manufactured by **Eaton (formerly Coiltronics)**. It is part of the HCF1305 series, designed specifically for applications requiring stable performance under high current loads and high-speed switching frequencies. --- ### 1. Technical Specifications The part number encodes specific data about the component's performance characteristics. | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.0 µH | | **Tolerance** | ±20% | | **Rated Current (Irms)** | ~17.5 Amperes | | **Saturation Current (Isat)** | ~22.0 Amperes | | **DC Resistance (DCR)** | ~4.6 mΩ (Max) | | **Operating Temperature** | -40°C to +125°C | | **Package / Case** | SMD (Surface Mount Device) | | **Dimensions** | ~12.5mm x 12.5mm x 5.0mm | --- ### 2. Key Features * **High Current Handling:** Designed to handle significant DC currents without hitting magnetic saturation quickly. * **Shielded Construction:** The inductor is magnetically shielded to minimize Electromagnetic Interference (EMI), which is critical in dense PCB layouts. * **Low DCR:** The low DC resistance minimizes power loss due to heat, increasing the overall efficiency of the power supply. * **Ferrite Core:** Utilizes a ferrite core material characterized by low core losses at high frequencies (up to 2 MHz). --- ### 3. Application Use Cases This component is typically found in DC-DC converter circuits where voltage regulation and filtering are necessary. 1. **Voltage Regulator Modules (VRM):** Used in CPUs and GPUs to provide stable, high-current power. 2. **Point-of-Load (POL) Converters:** Essential for stepping down voltages near the integrated circuits they power. 3. **Battery Powered Systems:** High efficiency makes it suitable for portable electronics. 4. **Solar Inverters:** Used in the filtering stages of power conversion. --- ### 4. Part Number Breakdown The naming convention follows Eaton’s standard logic: ```text HCF 1305 - 4R0 - R | | | | | | | └── RoHS Compliant | | └─────── Inductance Value (4R0 = 4.0 microhenries) | └────────────── Size Code (approx. 13mm x 5.0mm height) └─────────────────── High Current Ferrite (Series Name) ```