Embodiments of the present invention provide an improved closed cell
trench metal-oxide-semiconductor field effect transistor (TMOSFET). The
closed cell TMOSFET comprises a drain, a body region disposed above the
drain region, a gate region disposed in the body region, a gate insulator
region, a plurality of source regions disposed at the surface of the body
region proximate to the periphery of the gate insulator region. A first
portion of the gate region and the gate oxide region are formed as
parallel elongated structures. A second portion of the gate region and
the oxide region are formed as normal-to-parallel elongated structures. A
portion of the gate and drain overlap region are selectively blocked by
the body region, resulting in lower overall gate to drain capacitance.