## Technical Overview of CTX5-3A-R The **CTX5-3A-R** is a high-performance **Octa-Path toroidal inductor/transformer** manufactured by Eaton (formerly Cooper Bussmann/Coiltronics). It is part of the **OCTA-PAC® PLUS** series, designed for high power density and versatility in power conversion circuits. ### 1. Key Technical Specifications | Parameter | Value / Description | | :--- | :--- | | **Manufacturer** | Eaton (Coiltronics) | | **Inductance (Typical)** | 4.95 µH | | **Current Rating (RMS)** | 2.58 Amperes | | **DCR (DC Resistance)** | 0.0382 Ohms (Max) | | **Mounting Type** | Surface Mount (SMD) | | **Core Material** | Powder Iron (High Saturation) | | **Operating Temperature** | -40°C to +125°C | --- ### 2. Core Features and Construction * **Toroidal Design:** The use of a toroidal (ring-shaped) core helps contain the magnetic flux within the core, significantly reducing **Electromagnetic Interference (EMI)** compared to traditional E-core inductors. * **Dual Winding Versatility:** The CTX5-3A-R features two separate windings. This allows it to be configured in several ways: * **Series Connection:** To increase total inductance. * **Parallel Connection:** To increase current handling capability. * **1:1 Transformer:** To provide isolation or create SEPIC/Flyback topologies. * **Ruggedized Packaging:** The "R" suffix indicates it is RoHS compliant. The part is encased in a durable, heat-resistant header that ensures stable SMT placement. --- ### 3. Common Applications The CTX5-3A-R is specifically engineered for high-frequency DC-DC power conversion. 1. **Buck/Boost Converters:** Used for energy storage and filtering in voltage regulators. 2. **SEPIC Converters:** Ideal for applications where the input voltage can be higher or lower than the output voltage. 3. **DC-DC Isolation:** Can be used as a 1:1 transformer for signal or power isolation. 4. **Noise Filtering:** Acts as a common-mode choke when wired appropriately to suppress line noise. --- ### 4. Configuration Diagram (Conceptual) ```text Winding 1: Pins 1 --- (Core) --- 2 Winding 2: Pins 4 --- (Core) --- 3 Parallel (High Current): Connect 1-4 and 2-3 Series (High Inductance): Connect 2-4; Input at 1, Output at 3 ```