October 2011

RF components

Thin-film technology enables world’s smallest band pass filters with bottom terminals

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  • 50 percent smaller footprint than existing multilayer ceramic band pass filters

TDK-EPC, a group company of TDK Corporation, presents the new TFSB series of TDK thin-film band pass filters, which with a footprint of 1.0 x 0.5 mm² and an insertion height of just 0.3 mm are the world’s smallest*. Thanks to their innovative terminal configuration on their bottom surface the footprint of the low-profile 1005 components is about 50 percent less than for conventional filters. The new filters are designed for the 2.4 GHz and 5 GHz bands, making them suitable for Bluetooth and WLAN applications in smartphones and other mobile phones. Mass production has started in September 2011.

The new filters achieve low-loss signal transmission and high attenuation of unwanted signals, resulting in a high signal quality. The band pass filters were developed by using a thin-film micro-wiring technology that TDK developed for the manufacturing of magnetic heads for hard disk drives. This technology enables the successful combination of outstanding performance characteristics with small dimensions and a low-profile form factor, making the product ideal for RF modules designed for smartphones and other advanced mobile phones. The operating temperature range of the product is -40 to +85 ºC.

TDK-EPC is continually expanding its portfolio of RF components based on TDK’s innovative thin-film technology. In addition to the new band pass filters, this product family also includes capacitors, baluns, couplers and diplexers.

* As of October 2011, according to TDK investigations.

Main applications

  • Band pass filters in the 2.4 GHz and 5 GHz bands for WLAN and Bluetooth in smartphones as well as in conventional mobile phones, Bluetooth modules, Bluetooth headsets etc.

Main features and benefits

  • Application of thin-film technology developed for HDD heads results in world's smallest* band pass filters with dimensions of only 1.0 x .05 x 0.3 mm³
  • Bottom positioning of the terminals enables 50 percent footprint reduction, compared to similar ceramic filters.

Key data

Product designation

TFSB series
Frequency band [MHz]2400 to 25004900 to 5850
Max. insertion loss [dB]


Operating temperature range [°C] -40 to +85-40 to +85
Max. rated power [dBm]2727
Dimensions [mm] 1.0 x 0.5 x 0.31.0 x 0.5 x 0.3



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