The **CTX5-3-R** is a specific type of electronic component known as a **Toroidal Power Inductor** (or transformer depending on the circuit configuration), manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It belongs to the **OCTA-PAC®** series. --- ### 1. Key Technical Specifications The "CTX5-3-R" part number contains specific encoded data regarding its performance: | Parameter | Specification | | :--- | :--- | | **Inductance (L)** | 5.0 µH (Typical) | | **Current Rating (Irms)** | ~2.5 to 3.5 Amps (varies by wiring) | | **DCR (Direct Current Resistance)** | Low (approx. 0.030 - 0.045 $\Omega$) | | **Winding Configuration** | Dual Winding (2 identical coils) | | **Core Material** | Iron Powder (suitable for high frequencies) | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Functional Design The CTX5-3-R is unique because it features **two separate windings** on a single toroidal core. This allows for several circuit configurations: 1. **Series Connection:** Connects the two coils to double the inductance but maintains the same current rating. 2. **Parallel Connection:** Connects the two coils to maintain the base inductance but doubles the current-carrying capacity. 3. **1:1 Transformer:** Can be used as a flyback transformer or a common-mode choke. --- ### 3. Physical Characteristics * **Toroidal Shape:** The "donut" shape is highly efficient at containing magnetic flux, which minimizes Electromagnetic Interference (EMI) with surrounding components. * **Encapsulation:** The part is usually housed in a rugged, heat-resistant base with gold-plated or tin-plated leads for SMD soldering. * **RoHS Compliant:** The "-R" suffix at the end of the part number indicates it is Lead-Free and RoHS compliant. --- ### 4. Common Applications The CTX5-3-R is primarily used in power management and signal conditioning: * **DC-DC Converters:** Used as a storage inductor in buck, boost, or SEPIC converters. * **Isolation:** Used as a 1:1 isolation transformer for low-power data lines. * **Noise Filtering:** Acts as a common-mode choke to filter out high-frequency noise in power supplies. * **Battery Powered Devices:** Due to its high power density and small footprint. ---