### CTX15-2P-R: Technical Overview The **CTX15-2P-R** is a high-performance, surface-mount (SMT) dual-winding inductor, commonly referred to as a **OCTA-PAC®** series component manufactured by Eaton (formerly Coiltronics). It is designed for power conversion applications where space, efficiency, and versatility are critical. --- ### 1. Key Technical Specifications | Parameter | Value / Specification | | :--- | :--- | | **Inductance (Parallel)** | 14.8 µH | | **Inductance (Series)** | 59.2 µH | | **Current Rating (Isat)** | ~1.62 A (Parallel configuration) | | **DC Resistance (DCR)** | ~0.089 Ω (Parallel) | | **Package / Case** | OCTA-PAC® Size 2 | | **Operating Temperature** | -40°C to +125°C | | **Termination Style** | SMD/SMT (Gull-wing leads) | --- ### 2. Core Functional Features The CTX15-2P-R is unique because it contains **two identical windings** on a single toroidal core. This allows for three primary wiring configurations: * **Parallel Connection:** Connect the windings in parallel to double the current capacity while maintaining the base inductance (15µH range). * **Series Connection:** Connect the windings in series to quadruple the inductance (approx. 60µH) at the base current rating. * **1:1 Transformer Mode:** Use the part as a common-mode choke or an isolation transformer. ### 3. Construction and Materials * **Toroidal Geometry:** Uses a powdered iron or ferrite toroidal core, which inherently minimizes Electromagnetic Interference (EMI) because the magnetic flux is contained within the ring. * **Secure Mounting:** The core is mounted in a rugged base with gull-wing leads, making it suitable for automated pick-and-place assembly and infrared reflow soldering. * **Low Losses:** Engineered for low core losses at high frequencies, typically used in switching frequencies ranging from 100 kHz to over 1 MHz. --- ### 4. Common Applications Due to its dual-winding nature, the CTX15-2P-R is frequently found in: 1. **DC-DC Converters:** Specifically SEPIC (Single-Ended Primary-Inductor Converter) topologies. 2. **Buck/Boost Regulators:** Acting as the main energy storage inductor. 3. **Noise Filtering:** Used as a common-mode choke to filter out high-frequency noise in power lines. 4. **Isolation:** Providing basic signal or power isolation in low-power circuits. --- ### 5. Schematic Symbol Representation ```text 1 o---( Winding 1 )---o 2 4 o---( Winding 2 )---o 3 ``` *Note: Dots indicate polarity (phasing) for transformer or series applications.*