FAQ
Q.
Why are common mode filters / chokes necessary?
  • EMC Components
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  • Signal Line Common Mode Chokes/Filters


A. Common mode filters (common mode chokes) are used for noise suppression of differential transmission and power lines.
Filters and chokes are effective for suppression of radiation noise from electronic devices and cables, and for self-poisoning countermeasures (improved reception sensitivity) and noise immunity inside of wireless devices.
TDK’s common mode filters and chokes come in a diverse lineup for each type of usage. TDK has prepared a selection guide that makes it easy to check representative products.

All related FAQ
Q.
In which locations can common mode filters (common mode chokes) be effectively used as EMC countermeasure components?
  • Signal Line Common Mode Chokes/Filters
Q.
Please provide instructions on how to select common mode filters (common mode chokes).
  • Signal Line Common Mode Chokes/Filters
Q.
TDK’s common mode filters (common mode chokes) include multilayer products, thin-film products, and wire wound products, but what are their differences (features)?
  • Signal Line Common Mode Chokes/Filters
Q.
It seems that there is no mark indicating the winding direction (polarity) on common mode filters / chokes. If their directions are different when they are mounted, would the properties change?
  • Signal Line Common Mode Chokes/Filters
Q.
Are there any problems in mounting common mode filters / chokes in GND-signal lines?
  • Signal Line Common Mode Chokes/Filters
Q.
Can common mode filters / chokes be used on the primary side of a power supply? Can common mode filters / chokes be used in AC lines?
  • Signal Line Common Mode Chokes/Filters
Q.
Are there any problems in mounting common mode filters / chokes for signal lines?
  • Signal Line Common Mode Chokes/Filters
Q.
Where can I confirm the weight of common mode filters (common mode chokes)?
  • Signal Line Common Mode Chokes/Filters
Q.
Do common mode filters / chokes generate heat?
  • Signal Line Common Mode Chokes/Filters
Q.
Where can I view a list of TDK’s common mode filters (common mode chokes)?
  • Signal Line Common Mode Chokes/Filters
Q.
Where can the reflow conditions of TDK’s common mode filters (common mode chokes) be confirmed?
  • Signal Line Common Mode Chokes/Filters