The **CTX2-1-R** is a specific model of power inductor from the **OCTA-PAC®** series, originally manufactured by Cooper Bussmann (now part of **Eaton**). These components are known for their versatile "dual-winding" design, allowing them to be used in various configurations. --- ## 1. Technical Specifications Below are the primary electrical and physical characteristics of the CTX2-1-R: | Parameter | Value / Description | | :--- | :--- | | **Inductance (Parallel)** | 1.88 µH | | **Inductance (Series)** | 7.5 µH | | **Current Rating (Isat)** | ~7.2 A (Parallel) | | **DC Resistance (DCR)** | ~0.016 Ω (Parallel) | | **Package / Case** | OCTA-PAC® Size 2 (Surface Mount) | | **Operating Temperature** | -40°C to +125°C | | **Termination** | RoHS Compliant (R suffix) | --- ## 2. Key Features & Construction The "CTX" series is unique due to its **dual-winding** architecture. This means the device contains two separate coils wound on a single toroidal core. * **Configurability:** By changing the PCB layout, the two coils can be connected in **series** (for higher inductance) or **parallel** (for higher current handling). * **Toroidal Core:** Uses a powdered iron or ferrite toroidal core which offers high efficiency and low electromagnetic interference (EMI) compared to open-core inductors. * **Low Profile:** Designed for surface mount technology (SMT), making it suitable for compact power supplies. --- ## 3. Common Applications Because of its dual-coil nature, the CTX2-1-R is commonly found in: 1. **DC-DC Converters:** Used as the main energy storage inductor in Buck, Boost, or SEPIC converters. 2. **1:1 Transformers:** Can be used as a basic isolation transformer or a coupled inductor. 3. **Common Mode Chokes:** Used to filter out high-frequency noise in power lines. 4. **Battery Powered Equipment:** Its high efficiency and small footprint make it ideal for portable electronics. --- ## 4. Connection Guide To achieve different values, the pins are connected as follows: * **Parallel Connection:** Connect Pin 1 to 2 and Pin 3 to 4. This doubles the current capacity but keeps the base inductance. * **Series Connection:** Connect Pin 2 to 3. This quadruples the inductance (due to mutual coupling) and keeps the base current rating. ---