The **HC8-R39-R** is a high-current, low-profile power inductor typically manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the **HC8 series** of high-current power inductors. --- ## 1. Technical Specifications The part number can be broken down to understand its specific electrical characteristics: | Parameter | Specification | | :--- | :--- | | **Inductance** | 0.39 µH (indicated by "R39") | | **Tolerance** | ±20% | | **Current Rating (Irms)** | Approximately 34.5 Amps | | **Peak Current (Isat)** | Approximately 52.0 Amps (Saturation current) | | **DC Resistance (DCR)** | ~1.10 mΩ (milliohms) | | **Operating Temp** | -40°C to +125°C | | **Package/Case** | Surface Mount (SMD) - 10.9mm x 10.4mm footprint | --- ## 2. Key Features * **High Current Density:** Designed to handle very high amperage relative to its small physical size. * **Magnetically Shielded:** The construction minimizes Electromagnetic Interference (EMI) with surrounding components. * **Low DCR:** The extremely low DC resistance ensures minimal power loss through heat, making it highly efficient. * **Powder Iron Core:** Uses a material that provides a "soft" saturation characteristic, meaning the inductance drops gradually rather than abruptly when current increases. --- ## 3. Common Applications The HC8-R39-R is primarily used in power management circuits where high efficiency and high current are required: * **Voltage Regulator Modules (VRMs):** Found on motherboards for CPU and GPU power delivery. * **DC-DC Converters:** Used in point-of-load (POL) power supplies. * **Battery Powered Systems:** Ideal for portable devices requiring high current spikes. * **Solar Inverters:** Used in the filtering stages of power conversion. --- ## 4. Part Number Breakdown The naming convention follows this logic: ```text HC8 - R39 - R | | | | | +-- RoHS Compliant | +-------- Inductance Value (R39 = 0.39 microhenries) +-------------- Family Series (High Current, Size 8) ```