## Overview of CTX5-3P-R The **CTX5-3P-R** is a high-performance **toroidal power inductor** (specifically a Dual-Winding Octa-Pac®) manufactured by **Eaton (formerly Coiltronics)**. It is designed for high-density power applications where space, efficiency, and magnetic shielding are critical. --- ### 1. Key Technical Specifications | Parameter | Value / Specification | | :--- | :--- | | **Inductance** | 4.86 µH (Series) / 1.22 µH (Parallel) | | **Current Rating (Irms)** | 6.4 A (Series) / 12.8 A (Parallel) | | **DC Resistance (DCR)** | 0.0156 Ω (Series) / 0.0039 Ω (Parallel) | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +125°C | | **Dimensions** | ~11.4mm x 11.4mm x 6.0mm | --- ### 2. Physical and Structural Design * **Toroidal Core:** Uses a powdered iron core shaped like a "donut." This geometry naturally confines the magnetic flux within the core, leading to **low Electromagnetic Interference (EMI)**. * **Dual Winding Construction:** The "3P" in the part number indicates it contains two identical windings. This allows the component to be configured in different ways depending on how the pins are connected to the PCB. * **Surface Mount Package:** Designed for automated pick-and-place assembly with a flat top for suction nozzles. --- ### 3. Circuit Configurations Because the CTX5-3P-R has two windings, it is highly versatile: 1. **Series Connection:** Connecting the two windings in series doubles the inductance but halves the current capacity. 2. **Parallel Connection:** Connecting them in parallel keeps the inductance low but doubles the current capacity and significantly reduces DCR. 3. **1:1 Transformer:** Can be used as a SEPIC (Single-Ended Primary-Inductor Converter) inductor or a 1:1 isolation transformer. --- ### 4. Typical Applications * **DC-DC Converters:** Used in Buck, Boost, and SEPIC topologies. * **Computer Peripherals:** High-density power supplies for servers and workstations. * **Battery Powered Systems:** Ideal for portable electronics due to high efficiency. * **Filtering:** Used in input/output filters to reduce ripple current. --- ### 5. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **CTX** | Coiltronics series prefix | | **5** | Size code (Physical dimensions) | | **3P** | Inductance/Winding variant | | **-R** | RoHS compliant (Lead-free) |