SMD Common Mode Chokes

The CM Series Common Mode Chokes are independently separated from the legacy product range to support more focused EMI suppression design and calculation-based selection.
This series is suitable for both power line filtering and SMD common mode choke applications, offering engineers greater flexibility during EMC design.

Common Mode Choke Application Overview

A common mode choke application typically targets the suppression of high-frequency noise that appears simultaneously on multiple conductors.

CM Series chokes are widely applied in:

• Power input lines

• Signal and data lines

• Switching power supplies

• Industrial control systems

• Communication and embedded electronics

By blocking unwanted common-mode noise while allowing normal current flow, CM chokes form a critical part of any Emi Filter design.

SMD Common Mode Choke for Compact Designs

The SMD Common Mode Choke version of the CM Series is designed for space-constrained PCB layouts and automated assembly.

Key benefits include:

• Surface-mount compatibility

• Stable impedance over wide frequency ranges

• Low DC resistance

• High consistency for mass production

These characteristics make CM Series SMD chokes ideal for modern electronic designs requiring compact EMI suppression.

How a Common Mode Choke Works

A common mode choke operates by placing multiple windings on a shared magnetic core:

• Differential-mode currents generate opposing magnetic flux and cancel out

• Common-mode noise currents reinforce magnetic flux

• Increased impedance attenuates high-frequency interference

This operating principle is fundamental to both Power Line Common Mode Choke and SMD configurations.

Electrical Specifications – CM Series

CM Series vs Traditional Power Line Chokes

Compared with conventional chokes, CM Series products offer:

• Broader application coverage

• Flexible mounting options

• Improved suitability for compact PCB layouts

• Easier integration with Emi Filter networks

This makes CM Series suitable for both SMD Common Mode Choke applications and traditional power line filtering.

Custom Common Mode Choke Solutions

Ferrtx provides customization services for CM Series products, including:

• Inductance tuning

• Current rating adjustment

• Mechanical and footprint customization

• Application-specific EMI optimization

Custom solutions support advanced common mode choke application requirements across industries.

Why Choose FERRTX CM Series?

• Application-driven design approach

• Support for calculator-based EMI selection

• Compact SMD and power line options

• Stable quality and supply consistency

The CM Series Common Mode Chokes deliver a practical and flexible solution for engineers designing modern EMI suppression systems.