Patent ID: 8614482

Claim:
A semiconductor power device comprising a trench MOSFET having an active area and a termination area, further comprising: an epitaxial layer of said first conductivity type supported onto a substrate of said first conductivity type; a plurality of active trenched gates filled in active trenches surrounded by a source region of said first conductivity type encompassed in a body region of a second conductivity type in said active area, wherein each of said active trenched gates has a shielded gate structure comprising a shielded electrode in a lower portion and a gate electrode in an upper portion of each active trenches, wherein sidewalls and bottom of said shielded electrode is surrounded by a first gate insulating layer, sidewalls of said gate electrode is surrounded by a second gate insulating layer, wherein said shielded electrode and said gate electrode is insulated from each other by an inter-insulating layer; at least a connection trenched gate filled in a gate connection trench in a gate contact area; a wide termination trench formed in said epitaxial layer in said termination area, wherein said body region adjacent to trench sidewalls of said wide termination trench has a junction depth shallower than said wide termination trench; and a trenched field plate disposed along inner surface of said wide termination trench and padded with a termination insulating layer, having a L shape or an U shape structure.