### CTX10-3A-R Electronic Component Overview The **CTX10-3A-R** is a high-performance **Dual-Winding Toroidal Inductor** (often referred to as a "Common Mode Choke" or a "Configurable Inductor") manufactured by **Eaton (formerly Coiltronics)**. It is part of the **OCTA-PAC** series, designed for power conversion applications. --- ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance (Parallel)** | 10.4 µH | | **Inductance (Series)** | 41.6 µH | | **Current Rating (Parallel)** | 3.65 Amps | | **Current Rating (Series)** | 1.82 Amps | | **DCR (Direct Current Resistance)** | ~0.038 Ω (Parallel) | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +125°C | | **Core Material** | Powdered Iron (High efficiency) | --- ### Key Features and Construction 1. **Dual Winding Design**: The device contains two identical windings. This allows engineers to connect the pins in different configurations to change the inductance and current capacity. 2. **Toroidal Geometry**: The ring-shaped core minimizes electromagnetic interference (EMI) because the magnetic field is largely contained within the core. 3. **Low Profile**: Part of the OCTA-PAC family, it is designed for pick-and-place assembly on PCBs where vertical space might be limited. 4. **High Power Density**: The powdered iron core provides excellent saturation characteristics, meaning it maintains its inductance even as current increases. --- ### Typical Applications * **DC-DC Converters**: Used as a power inductor in buck, boost, or SEPIC converters. * **EMI Filtering**: Can be wired as a common-mode choke to filter out noise from power lines. * **Voltage Isolation**: Since there are two separate windings, it can act as a 1:1 transformer for basic signal or power isolation. * **Ripple Filtering**: Smoothing out current spikes in switching power supplies. --- ### Wiring Configurations | Configuration | Connection Method | Result | | :--- | :--- | :--- | | **Series** | Windings connected end-to-end. | **Higher Inductance (4x)**, Lower Current. | | **Parallel** | Windings connected side-by-side. | **Higher Current (2x)**, Lower Inductance. |