A transistor has {HEAD ~ a JFET gate region} of a first conductivity type formed at the face of a semiconductor layer to laterally and downwardly surround {TAIL ~ a drift region} of a second conductivity type 
A transistor has { HEAD ~ a JFET gate region } of a first conductivity type formed at the face of a semiconductor layer to laterally and downwardly surround { TAIL ~ a drift region } of a second conductivity type
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH