Prisource Electronics - Common Mode Choke Coils Design
What is a Common Mode Choke?
Common mode chokes are used in order to filter common mode electromagnetic interference (EMI) currents without de-rating under high currents and without causing signal degradation. Common mode chokes are applied to supply and return pairs of conductors and are ideal for EMI filtering of signal and power lines. Common mode chokes can withstand high DC currents without filtering performance degradation, which is an issue that can happen with differential mode filters such as small chip beads.
Types of Common Mode Chokes
There are many different kinds of common mode chokes and at Future Electronics we stock many of the most common types categorized by case size / dimension, impedance, rated current, maximum DC resistance, packaging type and rated voltage. The parametric filters on our website can help refine your search results depending on the required specifications.
The most common sizes for rated voltage are 50 V, 250 V and 500 V. We also carry common mode chokes with rated voltage as high as 250 kV. Rated current can be between 0.4 mA and 23 A, with the most frequent common mode chokes having a rated current of 500 mA, 1A or 2 A.
Applications for Common Mode Chokes:
Common Mode Chokes can be used in several industrial, electronic and telecommunication applications including:
- Automotive applications (ex: CAN bus)
- Suppression of radiation noise in electronic devices
- Countering common mode noise affecting signals in high-speed lines
- USB line for PCs and peripheral equipment.
- IEEE1394 lines for PCs
- Panel link lines for LCD panels