The **CTX310403-R** is a high-performance, shielded power inductor specifically designed for high-frequency DC-DC converter applications. It is part of the **Octa-Pac®** and **Econo-Pac™** series manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. --- ## 1. Technical Specifications The "R" suffix indicates that the part is **RoHS compliant**. Below are the key electrical characteristics: | Parameter | Value / Range | | :--- | :--- | | **Inductance** | 4.4 µH (Typical) | | **Current Rating (Irms)** | ~2.5 to 3.5 Amps (Varies by temperature rise) | | **DC Resistance (DCR)** | ~0.035 Ω (Typical) | | **Operating Temperature** | -40°C to +125°C | | **Core Material** | Powdered Iron (High Saturation) | | **Shielding** | Toroidal / Shielded construction | --- ## 2. Key Features & Design ### Multiple Winding Flexibility The most unique feature of the CTX310403-R is that it consists of **two separate windings**. This allows the component to be used in several configurations: * **Series Connection:** Increases the total inductance. * **Parallel Connection:** Maintains the base inductance but increases the current carrying capacity. * **1:1 Transformer:** Can be used as a coupled inductor for SEPIC or Flyback topologies. ### Construction * **Surface Mount (SMD):** Designed for automated pick-and-place assembly. * **Low EMI:** The closed magnetic path (toroidal design) minimizes electromagnetic interference, making it ideal for noise-sensitive environments. * **Robust Housing:** The Econo-Pac design provides high mechanical stability. --- ## 3. Common Applications Due to its high frequency and high current capabilities, it is commonly found in: 1. **Buck/Boost Converters:** Used as the primary energy storage element. 2. **SEPIC Topologies:** Utilizing the dual windings for coupled inductor circuits. 3. **Distributed Power Systems:** Found in telecommunications and industrial computing power modules. 4. **Battery Powered Equipment:** Used where high efficiency and low DCR are critical for battery life. --- ## 4. Equivalent Series Comparison | Series Name | Primary Use Case | | :--- | :--- | | **Octa-Pac** | Standard industrial performance. | | **Octa-Pac Plus** | Higher power density and higher temperature ratings. | | **Econo-Pac** | Cost-effective solutions for high-volume manufacturing. |