## CTX2-3A-R: Dual Inductor Component Overview The **CTX2-3A-R** is a high-performance, surface-mount (SMD) dual-winding inductor, commonly known as a **OCTA-PAC®** or **OCTA-PAC® PLUS** series component, manufactured by **Eaton (formerly Coiltronics)**. ### 1. Key Technical Specifications The following table outlines the primary electrical and physical characteristics of the CTX2-3A-R: | Parameter | Specification | | :--- | :--- | | **Manufacturer** | Eaton (Coiltronics) | | **Series** | OCTA-PAC® PLUS | | **Inductance (Parallel)** | ~2.3 µH | | **Inductance (Series)** | ~9.2 µH | | **Current Rating (Isat)** | ~4.7 - 11.5 Amps (depending on configuration) | | **DC Resistance (DCR)** | ~0.021 - 0.084 Ω | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +125°C | | **Configuration** | Dual Winding (Toroidal Core) | --- ### 2. Functional Characteristics The CTX2-3A-R is unique because it contains **two separate windings** on a single toroidal core. This allows for three primary wiring configurations: 1. **Series Connection:** Used to achieve higher inductance. 2. **Parallel Connection:** Used to achieve higher current handling capability. 3. **1:1 Transformer:** Can be used as a basic isolation or flyback transformer. ### 3. Core Material and Design * **Toroidal Geometry:** The "donut" shape minimizes electromagnetic interference (EMI) because the magnetic flux is largely contained within the core. * **OCTA-PAC® PLUS Advantage:** The "PLUS" designation typically indicates the use of **Kool Mµ®** or similar high-flux density core materials, which provide lower core losses at high frequencies compared to standard powdered iron. ### 4. Common Applications | Application | Role of CTX2-3A-R | | :--- | :--- | | **DC-DC Converters** | Acts as an energy storage inductor in Buck, Boost, or SEPIC topologies. | | **EMI Filtering** | Used as a common-mode choke to filter out noise in power lines. | | **Battery Powered Systems** | High efficiency and small footprint make it ideal for portable electronics. | | **Isolation** | Acts as a 1:1 coupled inductor for isolated power supplies. | ### 5. Part Number Breakdown * **CTX**: Coiltronics series prefix. * **2**: Size/Frame dimension indicator. * **3A**: Specific inductance/current rating code. * **-R**: RoHS compliant (lead-free). ---