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Common mode SMD chokes

Common mode SMD chokes are based on high permeability ferrite toroids with two symmetrical windings. The operating current flows through them in such a way that the magnetics fields cancel each other out. The operating current is only affected by the low stray inductance of the windings. If the currents in the windigs are different, because of asymmetric interference, a high inductance works on the differential current.

Common mode chokes are used mainly for RFI suppression of appliances, switch-sources, consumer electronics and machines. Moreover these highly symmetrical chokes can be used as transformers as well as for potential separation.

Our standard offer consists of chokes PMEC 100/SMD and 100/SMDn series.



Design, dimensions and technical data
Climatic category 40/125/21
Nominal voltage 250 V, 50 Hz
Testing voltage (winding - winding) 1500 V, 50 Hz, 2 sec.
Inductance tolerance 1) - 30 %, + 40 %
Overtemperature of the windings < 55 °C
Maximum admissible temperature of the windings 115 °C
3D model IGES STEP
1) Measured at 10 kHz, 50 mV and 25 °C.
The nominal current is applicable up to ambient temperature of 60 °C. Above this temperature descends the acceptable current linear to zero at 125 °C.
All measurements comply with the requirements of EN 60938-1 (VDE 0565 part 2).

Suitable for reflow soldering.

Insertion loss of common mode SMD chokes 100/SMD series

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