The **CTX110659-R** is a specific surface-mount electronic component manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the **OCTA-PAC®** series of power inductors/transformers. ### 1. General Specifications This part is a dual-winding toroidal inductor/transformer, which means it contains two separate windings on a single core. This allows it to be used as a single inductor, two coupled inductors, or a 1:1 transformer. | Feature | Specification | | :--- | :--- | | **Manufacturer** | Eaton (Bussmann Division) | | **Series** | OCTA-PAC® (Size 1) | | **Inductance** | ~6.8 µH (Typical per winding) | | **Mounting Type** | Surface Mount (SMD/SMT) | | **Core Material** | Powdered Iron (High saturation) | | **RoHS Status** | Compliant (-R suffix) | --- ### 2. Key Characteristics * **Dual Winding Design:** The device has four leads. You can connect the windings in **series** to increase inductance or in **parallel** to increase current-handling capability. * **High Efficiency:** The toroidal (ring-shaped) geometry provides excellent magnetic flux containment, which reduces Electromagnetic Interference (EMI). * **Versatility:** It can function as an inductor for buck/boost converters or as a transformer for flyback or forward converters. --- ### 3. Connection Configurations Depending on how you solder the device to your PCB, the electrical properties change: | Configuration | Connection Method | Effect | | :--- | :--- | :--- | | **Series** | Pin 2 connected to Pin 3 | 4x Inductance, same Current rating | | **Parallel** | Pin 1 to 4, Pin 2 to 3 | Same Inductance, 2x Current rating | | **1:1 Transformer** | Primary (1-2), Secondary (4-3) | Used for isolation or SEPIC converters | --- ### 4. Common Applications * **DC-DC Converters:** Often found in buck, boost, and SEPIC topologies. * **Computer Peripherals:** Used in power management for high-density boards. * **Filtering:** Acts as a common-mode choke to filter out high-frequency noise in power lines. ---