## Overview of CTX33-2-R The **CTX33-2-R** is a high-performance, surface-mount (SMD) dual-winding inductor (transformer) manufactured by **Eaton (formerly Cooper Bussmann)**. It belongs to the **OCTA-PAC®** series, which is specifically designed for high-density power applications. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Inductance** | 32.8 µH (±20%) | | **Current Rating (Irms)** | 1.14 Amperes | | **DC Resistance (DCR)** | 0.207 Ohms (Max) | | **Configuration** | Dual Winding (1:1 Ratio) | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | | **Core Material** | Powdered Iron | --- ### 2. Physical Characteristics The "R" suffix in the part number indicates that the component is **RoHS compliant** (lead-free). * **Design:** It features two separate windings that can be connected in series or parallel. * **Dimensions:** It utilizes the OCTA-PAC size 2 footprint, offering a compact profile for space-constrained PCBs. * **Shielding:** The toroid-based design provides inherent self-shielding, which minimizes Electromagnetic Interference (EMI). --- ### 3. Functional Applications Because it contains two identical windings, the CTX33-2-R is highly versatile: * **Buck/Boost Converters:** Used as a standard power inductor. * **1:1 Transformers:** Ideal for isolation or voltage level shifting. * **Common Mode Chokes:** Used to filter out high-frequency noise in power lines. * **SEPIC Converters:** Frequently used in Single-Ended Primary-Inductor Converters where two inductors are required on a single core. --- ### 4. Connection Configurations The component's performance changes based on how the two windings are wired: 1. **Parallel Connection:** * Maintains the base inductance (approx. 32.8 µH). * Increases the current handling capacity (doubles the Irms). * Lowers the total DCR. 2. **Series Connection:** * Increases the inductance by a factor of four ($L_{total} = L_1 + L_2 + 2M$). * Maintains the base current rating. ---