### Overview of CTX15-2A-R The **CTX15-2A-R** is a high-performance **Dual Inductor** (specifically a surface-mount toroidal inductor) manufactured by **Eaton (formerly Coiltronics)**. It belongs to the OCTA-PAC® series, designed for power conversion applications where space and efficiency are critical. --- ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance (Parallel)** | 14.8 µH | | **Inductance (Series)** | 59.3 µH | | **Current Rating (Parallel)** | 2.5 Amps | | **Current Rating (Series)** | 1.25 Amps | | **DC Resistance (DCR)** | 0.0485 Ω (per winding) | | **Package Type** | Surface Mount (SMD) | | **Core Material** | Powdered Iron (Toroidal) | | **Operating Temperature** | -40°C to +125°C | --- ### Key Electronic Features #### 1. Dual Winding Configuration The device contains two separate windings on a single core. This allows the component to be used in two different wiring modes: * **Series Mode:** Higher inductance, lower current. * **Parallel Mode:** Lower inductance, higher current. * **Transformer Mode:** Can act as a 1:1 ratio transformer or a coupled inductor. #### 2. Toroidal Core Design The use of a toroidal (donut-shaped) core ensures: * **Low EMI:** The magnetic field is contained within the core, reducing interference with nearby components. * **High Efficiency:** Lower core losses compared to traditional E-core designs. #### 3. Material Composition It utilizes a powdered iron core, which offers excellent saturation characteristics, meaning the inductance remains relatively stable even as the current increases toward the peak limit. --- ### Common Applications The CTX15-2A-R is typically found in the following electronic circuits: 1. **DC-DC Converters:** Specifically in Buck, Boost, and SEPIC topologies. 2. **Input/Output Filtering:** Used to smooth out ripple current in power supplies. 3. **Common Mode Chokes:** Because of the dual windings, it can be used to suppress high-frequency noise in signal lines. 4. **Voltage Isolation:** Used as a 1:1 transformer for basic circuit isolation. --- ### Pin Configuration The device usually features a 4-pin surface mount footprint. To change between Series and Parallel modes, the PCB traces must be designed as follows: * **Parallel:** Pins 1 & 2 tied together, Pins 3 & 4 tied together. * **Series:** Pin 2 connected to Pin 3 (Input at Pin 1, Output at Pin 4).