The **CTX50-4P-R** is a high-performance, shielded power inductor (often referred to as a "Octa-Pac" or "Octa-Pac Plus") manufactured by **Eaton (formerly Coiltronics)**. It is specifically designed as a multi-winding component, allowing it to be used in various power conversion topologies. --- ## 1. Technical Specifications The following table summarizes the primary electrical and physical characteristics of the CTX50-4P-R: | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 50 $\mu$H (nominal) | | **Current Rating (RMS)** | ~1.62 Amperes | | **Current Rating (Saturation)** | ~2.18 Amperes | | **DC Resistance (DCR)** | ~0.115 Ohms (Typical) | | **Number of Windings** | 2 (Dual Winding) | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +125°C | | **Package/Case** | Octa-Pac Size 4 | --- ## 2. Key Features * **Versatility:** Because it features two separate windings, the device can be configured in series, parallel, or as a 1:1 transformer. * **Magnetic Shielding:** The part is constructed to minimize Electromagnetic Interference (EMI), which is critical for densely packed PCB layouts. * **High Power Density:** Its unique "Octa-Pac" geometry allows for a high current-carrying capacity relative to its footprint. * **RoHS Compliant:** The "-R" suffix denotes that the part is lead-free and compliant with environmental standards. --- ## 3. Common Applications The CTX50-4P-R is frequently used in the following electronic circuits: 1. **DC-DC Converters:** Ideal for Buck, Boost, and SEPIC converters. 2. **Isolated Power Supplies:** Can act as a small isolation transformer. 3. **Common Mode Choke:** When wired appropriately, it can be used for noise filtering in power lines. 4. **Computer Peripherals:** Used in voltage regulation modules (VRMs) for servers and high-end desktops. --- ## 4. Connection Configurations Depending on how you solder the pins, the functionality changes: * **Parallel Connection:** Increases current capacity while maintaining the base inductance. * **Series Connection:** Increases the total inductance (4x the single winding inductance due to mutual coupling) but maintains the base current rating. ---