The **CTX5-2-R** is a specific model of high-performance inductor (specifically a dual-winding toroidal inductor) manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is part of the **OCTA-PAC®** series, known for its versatility in power conversion applications. --- ### 1. Key Specifications The following table highlights the critical technical parameters of the CTX5-2-R: | Parameter | Value / Specification | |:---|:---| | **Inductance (Open Circuit)** | 5.2 µH (±20%) | | **Current Rating (Irms)** | 6.4 Amps | | **Peak Current (Isat)** | 8.8 Amps | | **DCR (DC Resistance)** | 0.015 Ohms (Max) | | **Number of Windings** | 2 (Dual Winding) | | **Mounting Type** | Surface Mount (SMD) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Physical Design and Construction The "R" in the part number indicates that the component is **RoHS compliant**. * **Toroidal Core:** Uses a powdered iron core material. The toroidal shape is highly efficient because it contains the magnetic flux within the ring, resulting in very low Electromagnetic Interference (EMI). * **Dual Windings:** It contains two separate copper windings on the same core. These can be connected in several ways: * **Series:** Increases total inductance. * **Parallel:** Increases total current handling capacity. * **1:1 Transformer:** Can be used as a basic isolation or flyback transformer. * **Packaging:** It comes in a rugged, surface-mount header that provides mechanical stability during PCB soldering. --- ### 3. Common Applications Because of its dual-winding nature and high current capability, the CTX5-2-R is used in: 1. **DC-DC Converters:** Used in Buck, Boost, and Forward converters. 2. **SEPIC Converters:** Ideal for Single-Ended Primary-Inductor Converters where two inductors are needed on a single core to save space. 3. **Filter Inductors:** Used as a Common Mode Choke or a differential mode filter to reduce noise in power supplies. 4. **Energy Storage:** Acts as the primary energy storage element in switching power regulators. --- ### 4. Circuit Configuration Depending on how you wire the pins, the characteristics change: * **Parallel Connection:** Inductance stays at ~5.2 µH, but the current rating effectively doubles. * **Series Connection:** Inductance increases to ~20.8 µH (since $L_{total} = L_1 + L_2 + 2M$), but the current rating is limited to the single-wire capacity.