SEMICONDUCTOR DIODE CIRCUIT

PROBLEM TO BE SOLVED: To suppress a current flowing in a substrate through a parasitic transistor, without increasing the transistor size by providing an element for increasing the voltage drop between the base and collector of a PNP transistor, thereby lowering the potential at a contact between the base line and the collector line. SOLUTION: In this semiconductor diode circuit, an element comprising a resistor R for increasing a voltage drop is connected between the base and collector of a PNP transistor Q1 constituting a semiconductor diode, and an element for increasing the voltage drop between the base and collector of the PNP transistor Q1 uses a diode, an external resistor or an NPN transistor. Thus the potential at the contact between the base line and the collector line can be lowered due to the voltage drop, and the leakage current to the substrate can be suppressed, without increasing the transistor size.