## CTX20-2-R Component Overview The **CTX20-2-R** is a high-performance, surface-mount (SMD) toroidal inductor part of the **OCTA-PAC®** series manufactured by **Eaton (formerly Coiltronics)**. It is specifically designed as a dual-winding transformer or inductor for power applications. --- ### 1. Key Technical Specifications | Parameter | Value / Range | | :--- | :--- | | **Inductance** | 20.3 µH (Parallel) / 81.2 µH (Series) | | **Current Rating (Irms)** | 1.90 Amps (Parallel) | | **DC Resistance (DCR)** | 0.0678 Ω (Parallel) | | **Operating Temperature** | -40°C to +125°C | | **Package Type** | SMT (Surface Mount) | | **Core Material** | Powdered Iron (High Saturation) | --- ### 2. Functional Design The "20" in the part number refers to the energy storage capacity, and the "-2" indicates the size code. The most notable feature is its **dual-winding** configuration: * **Versatility:** The two identical windings can be connected in **series** (to increase inductance) or in **parallel** (to increase current handling). * **Magnetic Shielding:** The toroidal shape inherently provides a closed magnetic path, which results in low Electromagnetic Interference (EMI) and low flux leakage. * **Low Loss:** The powdered iron core is optimized for frequencies up to 500 kHz, offering a good balance between core losses and cost. --- ### 3. Common Applications Due to its robust thermal performance and high saturation levels, the CTX20-2-R is found in: 1. **DC-DC Converters:** Used as a power inductor in 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. **Filtering:** Used as a common-mode choke or a differential-mode filter for noise suppression. 4. **Isolation:** Can act as a 1:1 transformer for providing basic isolation between circuits. --- ### 4. Part Number Breakdown * **CTX:** Series prefix (OCTA-PAC). * **20:** Energy Rating (microjoules). * **2:** Physical Size/Case Dimension. * **-R:** RoHS compliant (Lead-free). ---