## Overview of the CTX15-2-R The **CTX15-2-R** is a high-performance, surface-mount (SMT) dual-winding inductor (or transformer) manufactured by **Eaton (formerly Coiltronics)**. It belongs to the **OCTA-PAC®** series, known for its versatility in power conversion applications. --- ### 1. Key Technical Specifications The following table outlines the primary electrical and physical characteristics of the CTX15-2-R: | Parameter | Specification | | :--- | :--- | | **Inductance (Parallel)** | 15.12 µH | | **Inductance (Series)** | 60.48 µH | | **Current Rating (Parallel)** | 2.50 Amps | | **Current Rating (Series)** | 1.25 Amps | | **DCR (Direct Current Resistance)** | ~0.054 Ω (Parallel) | | **Termination Style** | SMD/SMT (Surface Mount) | | **Operating Temperature** | -40°C to +125°C | | **Core Material** | Powdered Iron (Low Loss) | --- ### 2. Physical Configuration The CTX15-2-R features **two identical windings**. This dual-winding design allows engineers to configure the part in several ways depending on how the pins are connected to the PCB: * **Parallel Connection:** Connects the two coils side-by-side to increase the current-carrying capacity while keeping inductance low. * **Series Connection:** Connects the coils end-to-end to quadruple the inductance (since $L_{total} = L_1 + L_2 + 2M$) while halving the current capacity. * **1:1 Transformer:** Can be used as an isolation transformer or a SEPIC inductor where the two coils are electrically isolated but magnetically coupled. --- ### 3. Common Applications Due to its high power density and flexible winding configuration, the CTX15-2-R is commonly used in: 1. **DC-DC Converters:** Buck, Boost, and Forward converters. 2. **SEPIC Topology:** Ideal for Single-Ended Primary-Inductor Converters where two inductors are needed on a single core. 3. **EMI Filtering:** Used as a common-mode choke to filter electrical noise. 4. **Voltage Isolation:** Providing 1:1 ratio signal or power isolation. --- ### 4. Part Number Breakdown Understanding the nomenclature helps in identifying variants: * **CTX:** Series prefix (OCTA-PAC). * **15:** Nominal Inductance in microhenries (µH) when wired in parallel. * **2:** Size/Power rating code. * **-R:** RoHS compliant (Lead-free). ---