The **CTX10-2P-R** is a high-performance, surface-mount (SMT) dual-winding inductor/transformer, commonly part of the **OCTA-PAC®** series manufactured by Eaton (formerly Coiltronics). It is designed for versatility in power conversion circuits. --- ### 1. Key Technical Specifications The device features two identical windings that can be connected in series or parallel to change the electrical characteristics. | Parameter | Parallel Connection | Series Connection | | :--- | :--- | :--- | | **Inductance ($L$)** | $10.1\ \mu\text{H}$ | $40.5\ \mu\text{H}$ | | **Current Rating ($I_{rms}$)** | $3.5\ \text{A}$ | $1.75\ \text{A}$ | | **Peak Current ($I_{sat}$)** | $4.8\ \text{A}$ | $2.4\ \text{A}$ | | **DCR (Resistance)** | $0.035\ \Omega$ | $0.141\ \Omega$ | --- ### 2. Functional Characteristics * **Dual Winding Design:** It consists of two separate coils on a single powdered iron core. This allows the part to function as an inductor, a 1:1 transformer, or a common-mode choke. * **Magnetic Shielding:** The design minimizes Electromagnetic Interference (EMI), making it suitable for noise-sensitive environments. * **Compact Footprint:** The "2P" designation usually refers to the specific package size (approx. 11mm x 14mm), optimized for high power density. * **Material:** It uses a high-frequency powdered iron core material which offers low core losses and stable performance over temperature. --- ### 3. Common Applications The CTX10-2P-R is widely used in power management due to its flexibility: 1. **SEPIC Converters:** Used as the coupled inductor required to bridge the input and output stages. 2. **Flyback Transformers:** Providing isolation and voltage transformation in low-power DC-DC converters. 3. **Buck/Boost Regulators:** Acting as a standard storage inductor. 4. **Common-Mode Chokes:** Used in EMI filtering to suppress noise on power lines. --- ### 4. Part Number Breakdown `CTX` `10` `-2` `P` `-R` * **CTX:** Series prefix (OCTA-PAC). * **10:** Nominal inductance in microhenries ($\mu\text{H}$) when in parallel. * **2:** Size/Frame code. * **P:** Power rating/Performance variant. * **R:** RoHS compliant (Lead-free). ---