The **CTX50-3-R** is a high-performance, surface-mount dual-winding inductor (transformer) manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is part of the **OCTA-PAC®** series, known for its versatility in power conversion applications. --- ## 1. Technical Specifications The following table outlines the key electrical and physical characteristics of the CTX50-3-R: | Feature | Specification | | :--- | :--- | | **Inductance (Parallel)** | 50.1 µH (Typical) | | **Inductance (Series)** | 200.4 µH (Typical) | | **Current Rating (Isat)** | 2.50 Amperes | | **DC Resistance (DCR)** | 0.0881 Ohms (Max per winding) | | **Configuration** | Dual Winding (1:1 Ratio) | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +125°C | --- ## 2. Key Features and Construction * **Dual Winding Design:** It consists of two identical windings wrapped around a single toroidal core. This allows the component to be used as an inductor, a 1:1 transformer, or a common-mode choke. * **Toroidal Core:** Uses a powdered iron core material which provides high saturation flux density and low EMI (Electromagnetic Interference) radiation. * **Pick and Place Compatible:** Designed with a flat top for automated assembly lines. * **RoHS Compliant:** The "-R" suffix indicates that the part is lead-free and meets environmental standards. --- ## 3. Common Applications The CTX50-3-R is highly versatile due to its dual-winding nature. Common use cases include: 1. **DC-DC Converters:** Used in Buck, Boost, and SEPIC (Single-Ended Primary-Inductor Converter) topologies. 2. **Transformer Mode:** Can act as a 1:1 isolation transformer or a flyback transformer for low-power applications. 3. **Inductor Modes:** * **Series Connection:** Increases total inductance (4x single winding). * **Parallel Connection:** Increases current handling capability. 4. **EMI Filtering:** Used as a common-mode choke to filter out high-frequency noise in power lines. --- ## 4. Connection Diagram Depending on how you solder the pins, the functionality changes: ```text Series Connection: Parallel Connection: (1)---(4) (1)---+---(2) | | | (2)---(3) (4)---+---(3) (High Inductance) (High Current) ```