FK Dipped Radial Ceramic Capacitors TDK FK General and Mid-Voltage Dipped Radial Ceramic Capacitors provide large electrostatic capacity while maintaining a high level of reliability. FK capacitors feature a residual inductance that is small and provides good frequency characteristics. TDK FK series features leads that are formed with a kink to achieve consistent insertion heights and facilitate the release of gases during soldering for dramatically improved solderability.