The **HCP0805-R40-R** is a high-current power inductor manufactured by Eaton (formerly Bussmann). It is part of the HCP series, designed for high power density and efficiency in compact electronic circuits. --- ### 1. Part Number Breakdown Understanding the nomenclature helps identify its specific properties: | Segment | Meaning | Specification | | :--- | :--- | :--- | | **HCP** | Series Name | High Current Power Inductor | | **0805** | Case Size | 0805 (approx. 2.1mm x 1.6mm) | | **R40** | Inductance Value | 0.40 µH (Microhenries) | | **-R** | RoHS Compliance | Lead-free / RoHS compliant | --- ### 2. Technical Specifications These are the typical electrical characteristics for this specific component: | Parameter | Value | | :--- | :--- | | **Inductance** | 0.40 µH | | **Tolerance** | ±20% | | **DC Resistance (DCR)** | ~11.0 mΩ (Typical) | | **Saturation Current ($I_{sat}$)** | ~5.0 A to 7.0 A | | **RMS Current ($I_{rms}$)** | ~4.5 A (based on temp rise) | | **Operating Temperature** | -40°C to +125°C | | **Material** | Iron Powder Core (High Saturation) | --- ### 3. Key Features * **High Current Handling:** Unlike standard signal inductors, the HCP series uses a specialized core material that handles high peak currents without saturation. * **Low Core Losses:** Designed for high-frequency DC-DC converters (typically up to 2MHz or higher). * **Magnetically Shielded:** The construction minimizes Electromagnetic Interference (EMI), preventing the magnetic field from affecting nearby components. * **Surface Mount (SMD):** Designed for automated pick-and-place assembly on PCBs. --- ### 4. Common Applications This part is primarily used in power management stages where space is limited but power requirements are high: * **DC-DC Converters:** Buck, Boost, and Buck-Boost regulators. * **Mobile Devices:** Smartphones, tablets, and handheld consoles. * **Computing:** VRM (Voltage Regulator Modules) for CPUs and GPUs. * **Point of Load (POL):** Localized power regulation for FPGAs and ASICs. --- ### 5. Design Considerations When using the HCP0805-R40-R, engineers must consider: 1. **Self-Heating:** Ensure the $I_{rms}$ does not cause the component to exceed the 125°C limit. 2. **Saturation:** At high loads, the inductance drops. Ensure the circuit can handle a lower inductance value during peak current events. 3. **Pad Layout:** Use thick copper traces to dissipate heat and minimize resistance at the solder joints.