Patent ID: 6818954
Filing Date: 2004-11-16
Classification: H01L

Abstract:
A lateral high breakdown voltage MOSFET, comprising:a drain diffused layer formed on a surface side of a semiconductor substrate; a body diffused layer formed on the surface side of the semiconductor substrate surrounding the drain diffused layer; a source diffused layer formed in the body diffused layer at a specified distance from a boundary of the drain diffused layer; a drain contact diffused layer formed on a surface side of the drain diffused layer; a gate oxide film formed at an end portion of the source diffused layer over a portion of the drain diffused layer; a field oxide film formed on the surface of the drain diffused layer, in a region without the drain contact diffused layer and the gate oxide film; and a gate electrode formed above the gate oxide film over a part of the field oxide film, wherein the gate oxide film comprises a thickness in which an electric field value of an absolute maximum rated voltage between a source and a drain is equal to or less than 4 MV/cm, and a total amount of impurities in the drain diffused layer is equal to or more than 2Ã—1012/cm2.