## CTX68-1A-R Electronic Component Overview The **CTX68-1A-R** is a high-performance **Common Mode Choke** (Inductor) manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is primarily used for EMI (Electromagnetic Interference) filtering and noise suppression in power electronics. ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | Common Mode Choke / Dual Inductor | | **Inductance** | 68 µH (Nominal) | | **Current Rating (Irms)** | ~1.1 A | | **DCR (Direct Current Resistance)** | ~0.197 Ohms (Max per winding) | | **Mounting Type** | Surface Mount (SMD) | | **Package / Case** | OCTA-PAC® (Size 1) | | **Operating Temperature** | -40°C to +125°C | | **RoHS Status** | Compliant (-R suffix) | --- ### Key Features and Internal Structure 1. **Dual Winding Construction:** The device consists of two separate windings on a single toroidal core. This allows it to be used as a common-mode filter, a 1:1 transformer, or two separate inductors in a single package. 2. **OCTA-PAC® Design:** The "1A" in the part number refers to the physical size of the OCTA-PAC series. This packaging is designed for high-density power applications where space is limited. 3. **Magnetic Shielding:** The toroidal core design inherently provides low magnetic radiation, reducing the chance of interference with neighboring components on the PCB. 4. **Versatility:** Because the windings are separate, they can be connected in series or parallel to double the inductance or the current capacity. ### Common Applications * **Switching Power Supplies (SMPS):** Used to filter out high-frequency noise on the input or output lines. * **DC-DC Converters:** Acts as an energy storage element or an output filter. * **EMI Suppression:** Attenuates common-mode noise in data lines and power systems. * **Isolation:** Can provide basic functional isolation between two circuits. --- ### Terminal Configuration Example When using this part, pay close attention to the dot notation (polarity) on the datasheet to ensure proper phase relationship between the two windings: ```text Winding 1: Pins 1 to 2 Winding 2: Pins 4 to 3 (Dot usually indicates start of winding) ```