Patent ID: 8507986

Claim:
A semiconductor device comprising: at least a first and a second semiconductor cell each comprising material regions extending in a Z direction, the regions spaced apart in an X direction; the first and the second semiconductor cells each comprising: a substrate; a drain contact on a first surface of the substrate; an epitaxial layer on a second surface of the substrate, the second surface opposite the first surface, the epitaxial layer doped a first dopant type; a first doped region extending in a Y direction from an upper surface of the epitaxial layer and doped a second dopant type; a first and a second sources spaced apart in the X direction, disposed within the first doped region, and doped the first dopant type, the first and second sources formed in a self-aligned manner relative to the first doped region; source rungs in the first doped region, each source rung connecting the first and second sources at a different location along the first and second sources, the source rungs alternating with first doped regions and formed in a self-aligned manner relative to the first and second sources, the source rungs comprising dopants of the first dopant type; and wherein an area of the source rungs and an area of the first doped regions are independently determinable responsive to a contact resistance of the source rung and a contact resistance of the first doped region.