The **CTX300-3-R** is a specific electronic component, typically categorized as a **Surface Mount Device (SMD) Power Inductor**. It is part of the CTX series manufactured by companies like Eaton (formerly Bussmann/Coiltronics). Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. Core Technical Specifications The "300" in the part number usually refers to the inductance value, while the "3" refers to the size/rating code. | Parameter | Typical Value / Description | | :--- | :--- | | **Inductance** | 30.0 µH (Microhenries) | | **Tolerance** | ±20% (Standard for power inductors) | | **Current Rating (Isat)** | ~1.5A to 2.5A (Depends on specific package size) | | **DC Resistance (DCR)** | Low (Designed for high efficiency) | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Shielding** | Unshielded or Semi-shielded (drum core design) | --- ### 2. Physical Construction The CTX series utilizes a specific architectural design to balance size and performance: * **Core Material:** Ferrite. This allows for high-frequency operation with minimal core losses. * **Base/Header:** Typically features a flat top for automated "Pick and Place" assembly. * **Terminations:** Solder-plated copper leads designed for reflow soldering. * **Suffix "-R":** This indicates that the part is **RoHS Compliant** (Lead-free). --- ### 3. Key Electronic Functions In a circuit, the CTX300-3-R serves several critical roles: 1. **Energy Storage:** In DC-DC converters (Buck, Boost, or Buck-Boost), it stores energy in its magnetic field during the "on" cycle and releases it during the "off" cycle. 2. **Filtering:** It acts as a low-pass filter, smoothing out ripples in current to provide a stable DC output. 3. **Noise Suppression:** It blocks high-frequency AC noise while allowing DC to pass, helping with Electromagnetic Interference (EMI) management. --- ### 4. Common Applications Due to its power handling capabilities, it is frequently found in: * **Power Supplies:** Switching regulators and VRMs (Voltage Regulator Modules). * **Consumer Electronics:** Laptops, tablets, and LED drivers. * **Industrial Equipment:** Distributed power systems and DC-DC modules. --- ### 5. Equivalent Replacement Guide If sourcing this specific part is difficult, look for inductors with these matching parameters: * **Footprint:** Ensure the pad dimensions (Length x Width) match for PCB compatibility. * **Saturation Current ($I_{sat}$):** The replacement must have an equal or higher $I_{sat}$ to prevent core saturation. * **DCR:** A higher DCR will result in more heat and lower efficiency.