### Overview of CTX110655-R The **CTX110655-R** is a high-performance **Common Mode Choke** (also referred to as an inductor) manufactured by **Eaton (formerly Cooper Bussmann/Coiltronics)**. It is primarily designed for EMI (Electromagnetic Interference) filtering in power supplies and data lines. --- ### Technical Specifications | Parameter | Specification | | :--- | :--- | | **Component Type** | Common Mode Choke | | **Inductance** | ~55 µH (Typical) | | **Current Rating** | ~1.1 A | | **DC Resistance (DCR)** | ~0.150 Ohms | | **Mounting Type** | Surface Mount (SMD) | | **Package / Case** | Custom SMD (Toroidal core in a header/base) | | **Operating Temperature** | -40°C to +85°C | --- ### Key Electronic Components & Construction The CTX110655-R consists of several critical sub-parts that determine its electrical characteristics: #### 1. Magnetic Core * **Material:** Typically uses a high-permeability **Ferrite** or **Iron Powder** toroidal core. * **Function:** Concentrates the magnetic flux to provide high impedance to common-mode noise while allowing differential-mode signals to pass with minimal attenuation. #### 2. Windings (Coils) * **Material:** Enameled Copper Wire. * **Configuration:** It features **dual windings**. In a common-mode choke, the two coils are wound in a way that magnetic fields from common-mode currents add up (creating resistance), while fields from differential-mode currents cancel out. #### 3. Base/Header * **Material:** Liquid Crystal Polymer (LCP) or similar high-temperature plastic. * **Function:** Provides the physical structure to hold the toroid and aligns the leads for surface mount soldering. #### 4. Terminations * **Plating:** Typically Tin (Sn) over Nickel (Ni). * **Compliance:** The "-R" suffix indicates that the part is **RoHS compliant** (Lead-free). --- ### Typical Applications * **Switching Power Supplies:** Used to filter out high-frequency noise generated by MOSFET switching. * **DC-DC Converters:** Placed on input/output lines to meet EMC regulations. * **Data Lines:** Protecting sensitive communication lines from external interference. --- ### Schematics Representation In a circuit diagram, the CTX110655-R is represented as two coupled inductors: ```text Line In 1 (Pin 1) o---( Coil 1 )---o Line Out 1 (Pin 4) ) ) ( ( Line In 2 (Pin 2) o---( Coil 2 )---o Line Out 2 (Pin 3) ```