The **CMT2-10-R** is a specific electronic component belonging to the **Common Mode Choke** family, manufactured by Coiltronics (a brand under Eaton/Bussmann). It is primarily used for EMI (Electromagnetic Interference) filtering in power applications. --- ### 1. Key Technical Specifications The CMT2-10-R is designed to suppress high-frequency noise while allowing the desired DC or low-frequency AC current to pass through. | Parameter | Specification | |:---|:---| | **Inductance (Typical)** | 10.0 mH | | **Rated Current (max)** | 1.1 Amps | | **DCR (Direct Current Resistance)** | 0.400 Ohms (max per winding) | | **Mounting Type** | Through-Hole (Vertical Mount) | | **Operating Temperature** | -40°C to +125°C | | **Dielectric Strength** | 1500 Vac (Winding to Winding) | --- ### 2. Physical Construction The "R" suffix in the part number indicates that the component is **RoHS compliant**. * **Core Material:** Ferrite core, which provides high permeability to maximize inductance in a small footprint. * **Winding Style:** Toroidal (ring-shaped) design. This shape is highly efficient at containing the magnetic field, reducing stray EMI. * **Encapsulation:** Often mounted on a plastic header or base for stability during PCB soldering. --- ### 3. Functional Working Principle The CMT2-10-R works by utilizing two identical coils wound on a single core: 1. **Common Mode Noise:** When noise signals travel in the same direction on both lines, the magnetic fields from the two coils add up. This creates high impedance, effectively blocking the noise. 2. **Differential Mode (Signal):** The intended current flows in opposite directions through the coils. The magnetic fields cancel each other out, allowing the signal to pass with minimal resistance. --- ### 4. Common Applications This part is typically found in the input stages of power supplies to comply with global EMC regulations. * **Switch Mode Power Supplies (SMPS):** Filtering out switching noise from the AC line. * **LED Drivers:** Preventing high-frequency flicker and interference. * **Industrial Electronics:** Protecting sensitive sensors from power line transients. * **Adapters/Chargers:** Reducing conducted emissions back into the wall outlet. --- ### 5. Part Number Breakdown (CMT Series) ```text CMT 2 - 10 - R | | | | | | | +-- RoHS Compliant | | +-------- Inductance Value (10mH) | +--------------- Size/Package Style (Size 2) +------------------- Common Mode Toroid Series ```