### CTX1-2P-R: Product Overview and Specifications The **CTX1-2P-R** is a high-performance, shielded power inductor belonging to the **OCTA-PAC®** series, manufactured by **Eaton (formerly Coiltronics)**. These components are unique because they contain two individual windings that can be configured in various ways. --- ### 1. Key Technical Specifications | Parameter | Value / Range | | :--- | :--- | | **Inductance (Parallel)** | 1.15 µH | | **Inductance (Series)** | 4.6 µH | | **Current Rating (Irms)** | 6.4 A | | **DCR (DC Resistance)** | 0.0094 Ω (Parallel) | | **Operating Temperature** | -40°C to +125°C | | **Core Material** | Powdered Iron | | **Shielding** | Yes (Toroidal design) | --- ### 2. Physical Construction and Features * **Dual Winding Design:** The "2P" in the part number indicates two separate windings. This allows the inductor to function as: 1. **A Single Inductor:** By connecting windings in series or parallel. 2. **A Coupled Inductor:** For use in SEPIC or Zeta converters. 3. **A 1:1 Transformer:** For isolation or voltage transformation applications. * **Toroidal Geometry:** The use of a toroid core minimizes electromagnetic interference (EMI) and flux leakage, making it suitable for noise-sensitive environments. * **Surface Mount (SMD):** Designed for automated pick-and-place assembly. --- ### 3. Connection Configurations The performance of the CTX1-2P-R changes based on how the two internal coils are wired on the PCB: #### Series Connection * **Inductance:** Increases by a factor of 4 ($L_{total} = L_1 + L_2 + 2M$). * **Current:** Limited to the rating of a single winding. * **Usage:** High-voltage applications or where higher inductance is needed. #### Parallel Connection * **Inductance:** Remains the same as a single winding. * **Current:** Doubles, as the load is split between two paths. * **Usage:** High-current power supplies. --- ### 4. Common Applications * **DC-DC Converters:** Buck, Boost, and Buck-Boost topologies. * **SEPIC Converters:** Utilizing the coupled nature of the two windings. * **EMI Filtering:** Used as a common-mode choke to filter out high-frequency noise. * **Computer and Industrial Power:** Distributed power systems and battery-powered devices.