Patent ID: 7649229
Filing Date: 2010-01-19
Classification: H01L

Abstract:
1. A semiconductor device comprising: an internal circuit connected to first and second source lines; and a protection circuit connected to the first and second source lines to protect the internal circuit, wherein the protection circuit has a protection transistor which includes first high-concentration impurity regions each connected to the first source line, second high-concentration impurity regions each connected to the second source line, and control electrodes which have first control electrodes each having a first gate length and second control electrodes each having a second gate length longer than the first gate length, the first and second control electrodes are connected to each other and to the second source line, wherein the protection transistor includes first transistor structural portions each having the first high-concentration impurity regions, the second high-concentration impurity regions and the first control electrodes, and second transistor structural portions each having the first high-concentration impurity regions, the second high-concentration impurity regions and the second control electrodes, and wherein contacts for connecting the first high-concentration impurity regions to the first source line are provided in the second transistor structural portions respectively and not in the first transistor structural portions.