| 摘要 |
In a semiconductor device in which an analog section to which power source lines Vdd1 and Vss1 are supplied and a digital section to which power source lines Vdd2 and Vss2 are supplied are mounted in an N-type semiconductor substrate and connected to each other by a signal line S11, a protection circuit HK1 is located between the power source line Vdd1 and Vdd2, the protection circuit becoming conductive when a potential difference between the power source lines Vdd1 and Vdd2 exceeds a prescribed value irrespectively of the direction of a surge input, thereby placing the power source lines Vdd1 and Vdd2 at substantially the same potential.
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