Patent ID: 9287255
Filing Date: 2016-03-15
CPC Classification: H01L

Claim Text:
1. A semiconductor device having a protection circuit, the protection circuit comprising: a first region of semiconductor material having a first conductivity type and a first dopant concentration; a second region of semiconductor material having a second conductivity type opposite the first conductivity type; a third region of semiconductor material having the first conductivity type and a second dopant concentration that is greater than the first dopant concentration, wherein at least a portion of the third region is disposed between the first region and the second region; a fourth region of semiconductor material having the first conductivity type and a third dopant concentration that is different from the second dopant concentration and different from the first dopant concentration, wherein at least a portion of the fourth region is disposed between the second region and the third region; a fifth region of semiconductor material having the first conductivity type; and a sixth region of semiconductor material within the third region, the sixth region having the second conductivity type, wherein at least a portion of the first region is disposed between the fifth region and the sixth region.