A semiconductor switch circuit comprises: a first switch pair including two MOSFETs having gates connected one another and sources connected to one another, and a zener diode reversely connected between the gates and sources of the MOSFETs a second switch pair including two MOSFETs having gates connected one another and sources connected to one another, and a zener diode reversely connected between the gates and sources of the MOSFETs and a third switch pair comprising two MOSFETs having gates connected to one another and sources connected to one another. The first switch pair and the second switch pair are connected in series between two input/output terminals through a connecting node. The third switch pair is connected to the connecting node between the first switch pair and the second switch pair.
