Patent ID: 7034377

Claim:
A semiconductor device comprising: a semiconductor substrate; a trench formed in the substrate; at least one non-trench region surrounded by the trench; a plurality of active regions formed on the substrate over the trench, each for driving current as a semiconductor element; a first diffusion region formed at a bottom of the trench in the active regions; and a second diffusion region formed in the non-trench region, wherein current is flowable between the first diffusion region and the second diffusion region, wherein the trench comprises a plurality of first trench sections formed in the active regions, and a plurality of second trench sections intersecting the first trench sections to form a mesh pattern surrounding the non-trench region, wherein the first diffusion region is formed at the bottom of the first trench sections, and wherein the trench further includes at least one third trench section connected to the first or second trench sections or both the first and second trench sections to divide the non-trench region into a plurality of smaller regions, wherein a first conductor is formed with an insulator film interposed therebetween in the first, second, and third trench sections, and wherein the width of each of the second and third trench sections is smaller than the width of each of the first trench sections.