The **CTX8-3-R** is a specific type of electronic component known as a **Configurable Dual-Winding Inductor/Transformer**. It is manufactured by Eaton (formerly Cooper Bussmann/Coiltronics) as part of the OCTA-PAC® series. ### 1. Key Technical Specifications The "8" in the part number refers to the size/power rating, and the "3" indicates the specific inductance value for that series. | Parameter | Specification (Typical) | | :--- | :--- | | **Inductance (Parallel)** | ~2.91 $\mu$H | | **Inductance (Series)** | ~11.64 $\mu$H | | **Current Rating (Isat)** | ~8.0 Amps (Parallel) | | **DC Resistance (DCR)** | ~0.009 $\Omega$ | | **Operating Temperature** | -40°C to +125°C | | **Mounting Type** | Surface Mount (SMD) | --- ### 2. Core Functional Features * **Dual Winding Construction:** The device consists of two separate copper windings wound around a single toroidal ferrite core. This allows the component to be used in multiple configurations. * **High Efficiency:** Uses a toroidal geometry which provides inherent self-shielding and low magnetic radiation (low EMI). * **"R" Suffix:** The "R" indicates that the part is **RoHS compliant** (lead-free). --- ### 3. Wiring Configurations Because it has two identical windings, the CTX8-3-R can be used in three primary ways: 1. **Series Inductor:** Connecting the windings in series increases total inductance ($L_{total} = L1 + L2 + 2M$). 2. **Parallel Inductor:** Connecting them in parallel maintains the base inductance but doubles the current-handling capacity. 3. **1:1 Transformer:** Using one winding as the primary and the other as the secondary for isolation or voltage transformation. --- ### 4. Common Applications * **DC-DC Converters:** Used in Buck, Boost, Forward, and SEPIC converter topologies. * **Power Filtering:** Acting as a common-mode choke to filter out noise in power lines. * **Voltage Isolation:** Providing basic isolation between two circuits in a 1:1 ratio.