Patent ID: 7564103

Claim:
A switching transistor, comprising: a substrate having a substrate dopant concentration; a barrier region bordering on the substrate, comprising a first conductivity type and having a barrier region dopant concentration, which is higher than the substrate dopant concentration; a source region embedded in the barrier region, comprising a second conductivity type different to the first conductivity type, and having a source region dopant concentration, which is higher than the barrier region dopant concentration; a drain region embedded in the barrier region and disposed offset from the source region, comprising the second conductivity type and having a dopant concentration, which is higher than the barrier region dopant concentration; a channel region extending between the source region and the drain region, wherein the channel region comprises a subregion of the barrier region; an insulation region, which covers the channel region and is disposed between the channel region and a gate electrode; a further barrier region having the second conductivity type, the further barrier region having a dopant concentration that is higher than the substrate dopant concentration; and a substrate terminal region embedded in the further barrier region, having the first conductivity type and a substrate terminal region dopant concentration, which is higher than the dopant concentration of the further barrier region.