Semiconductor switching circuit device

A semiconductor switching circuit device for switching high frequency signals in response to a control signal, comprising:

• a first field effect transistor and a second field effect transistor;
• an electrode pad receiving the control signal and connected to the first field effect transistor or the second field effect transistor;
• an insulating layer disposed on the first and second field effect transistor;
• and
• a metal layer disposed above the first insulating layer and connected to the electrode pad.

A semiconductor switching circuit device comprising:

• a field effect transistor comprising a source electrode, a gate electrode and a drain electrode;
• a signal input electrode pad receiving a high frequency signal and connected to the source electrode or the drain electrode;
• a signal output electrode pad outputting the high frequency signal and connected to the source electrode or the drain electrode which is not connected to the signal input electrode pad;
• a control electrode pad receiving a control signal and applying the control signal to the gate electrode;
• and
• means for preventing the high frequency signal from leaking between the source electrode and the drain electrode when the field effect transistor is switched off and the high frequency signal is applied to the signal input electrode pad.