The **C520-4-R** is a specific electronic component belonging to the **High-Power Inductor** category, typically manufactured by **Eaton (formerly Coiltronics/Bussmann)**. It is a surface-mount (SMD) device designed for high-frequency power conversion. --- ### 1. General Specifications The C520 series is known for its low profile and high power density. Below are the technical characteristics specific to the **-4-R** variant: | Parameter | Specification | | :--- | :--- | | **Inductance** | 4.0 µH (Typical) | | **Current Rating (Irms)** | ~2.5 Amps to 3.5 Amps (Varies by thermal load) | | **Peak Current (Isat)** | ~4.0 Amps to 4.5 Amps | | **DC Resistance (DCR)** | ~0.035 to 0.045 Ohms (Max) | | **Operating Temperature** | -40°C to +125°C | | **Packaging** | Surface Mount (SMD) | | **RoHS Compliant** | Yes (indicated by the "-R" suffix) | --- ### 2. Key Features and Construction * **Magnetic Shielding:** These inductors are usually shielded to minimize Electromagnetic Interference (EMI), making them suitable for densely packed circuit boards. * **Ferrite Core:** Utilizes a ferrite core material which provides low core losses at high switching frequencies. * **Rugged Design:** The "C520" designation refers to the physical size (footprint and height), designed to handle significant current without overheating. * **Lead-Free:** The **-R** at the end of the part number signifies that the part is fully compliant with RoHS standards (Lead-free). --- ### 3. Common Applications The C520-4-R is primarily used in power management circuits where voltage needs to be stepped up or down efficiently. 1. **DC-DC Converters:** Buck, Boost, and SEPIC topologies. 2. **Voltage Regulator Modules (VRMs):** Used in laptops and desktop motherboards. 3. **Battery Powered Devices:** Providing stable current for portable electronics. 4. **LED Drivers:** Managing current flow for high-brightness lighting applications. --- ### 4. Circuit Representation In a schematic, this part is represented as an inductor. If you are using it in a simulation (like SPICE), you would define it as follows: ```spice * Example SPICE instantiation L1 NodeA NodeB 4uH ; Inductor with 4 microhenries R_series NodeB NodeC 0.04 ; Approximate DC Resistance ``` ---