Power Electronics
The new commonmode filter suppresses commonmode noise without distorting highspeed differential signals Image courtesy of TDK

The new common-mode filter suppresses common-mode noise without distorting high-speed differential signals. (Image courtesy of TDK).

Miniaturized Thin-Film Common-Mode Filter for High-Speed Interfaces

TDK Corp. has expanded its lineup of common-mode filters. The new TCM0403R thin-film common-mode filter offers a common-mode attenuation of 27.5 dB at 850 MHz in a 0403 package (0.45 x 0.30 mm). The footprint of the TCM0403R is nearly 60 percent smaller than the existing TCM0605R with same common-mode attenuation. In addition, the new filter features an extremely low insertion height of only 0.23 mm.

With a cutoff frequency of 5.0 GHz and common-mode attenuation characteristics in 500 MHz to 2.4 GHz range, the new filter suppresses common-mode noise without distorting high-speed differential signals. It is thus compatible with various high-speed interfaces such as MIPI, USB 2.0, and USB 3.0. The typical DC resistance is 3.5 W. As a result, the new TCM0403R thin-film common-mode filter significantly improves the WLAN reception sensitivity in smartphones, conventional mobile phones and other compact portable devices. Mass production began in May 2015.

The miniaturization was realized using TDK's thin-film patterning technology that it developed through HDD magnetic head manufacturing combined with compact, high-precision coil pattern and terminal formation processes. Thanks to its much smaller footprint, the new filter supports the high-density mounting of electronic components and contributes to significant space-savings in electronic devices.

Main features and benefits:

  • 5.0 GHz cutoff frequency for compatibility with high-speed interfaces
  • Common-mode attenuation characteristics in 500 MHz to 2.4 GHz range for improved mobile signal reception sensitivity; common-mode attenuation of 27.5 dB at 850 MHz
  • Significant size reduction, combined with typical DC resistance of 3.5 W
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