The **CTX50-2-R** is a high-performance, surface-mount (SMD) dual-winding inductor, commonly referred to as a **Common Mode Choke** or a **Toroid Transformer**, manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the **OCTA-PAC® PLUS** series, known for its versatility in power conversion and EMI filtering applications. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Inductance (Parallel)** | 50.8 µH | | **Inductance (Series)** | 203 µH | | **Current Rating (Isat)** | ~1.42 A (Parallel configuration) | | **DC Resistance (DCR)** | ~0.145 Ω (per winding) | | **Operating Temperature** | -40°C to +125°C | | **Termination Style** | SMD/SMT (Gull-wing leads) | | **Size / Dimension** | ~11.4mm x 11.4mm x 6.0mm | --- ### 2. Physical Construction * **Core Material:** Powered Iron. This provides stable performance and high saturation flux density, making it suitable for high-power applications. * **Dual Winding:** The part contains two separate copper windings on a single toroidal core. This allows the component to be wired in different configurations. * **Shielding:** The toroidal shape naturally contains the magnetic flux, providing inherent self-shielding and reducing Electromagnetic Interference (EMI). --- ### 3. Connection Configurations Because it has two windings, the CTX50-2-R can be used in three primary ways: 1. **Series Connection:** Connects the two coils in a row. This quadruples the inductance ($L$) but keeps the current rating low. 2. **Parallel Connection:** Connects the coils side-by-side. This maintains the base inductance but doubles the current-carrying capacity ($I$). 3. **1:1 Transformer:** The two coils act as a primary and secondary, allowing for galvanic isolation or voltage transformation. --- ### 4. Common Applications * **DC-DC Converters:** Used in Buck, Boost, and SEPIC topologies as the energy storage element. * **Common Mode Choke:** Used in input/output filters to suppress electrical noise. * **Isolation:** Small-scale signal or power isolation for industrial controllers. * **Computer/Telecom:** Power supplies for servers and networking hardware. ---