Patent ID: 7835122

Claim:
A semiconductor integrated circuit device, comprising: as means for electrical connection with outside the device, at least a first external terminal that is connected to a power source line when the device is normally mounted; a second external terminal that is connected to a predetermined signal line when the device is normally mounted and that is connected to the power source line when the device is reversely mounted; a third external terminal that is connected to a ground line when the device is normally mounted; and a fourth external terminal that is connected to a predetermined signal line when the device is normally mounted and that is connected to the ground line when the device is reversely mounted, and as electrostatic protection means for protecting the fourth external terminal when the device is normally mounted, an electrostatic protection diode an anode of which is connected to the third external terminal and a cathode of which is connected to the fourth external terminal, wherein the semiconductor integrated circuit device further includes: as means for preventing breakage of the second external terminal when the device is reversely mounted, a current control resistor one end of which is connected to the second external terminal; and a Zener diode an anode of which is connected to the third external terminal and a cathode of which is connected to another end of the current control resistor.