Patent ID: 7102869

Claim:
An optical semiconductor relay comprising: a light emitting element converting an electrical signal into an optical signal; a first photodiode array receiving the optical signal from the light emitting element, the first photodiode array converting the optical signal into an electrical signal; a first diode having one electrode connected to one end of the first photodiode array; a MOSFET having a gate terminal connected to other electrode of the first diode, and a source terminal connected to other end of the first photodiode array; a second photodiode array receiving the optical signal from the light emitting element, the second photodiode array converting the optical signal into an electrical signal, and having both ends connected to the respective electrodes of the first diode; and a control circuit including an impedance element connected between the gate and source terminals of the MOSFET, a bipolar transistor having base and collector terminals connected to both terminals of the impedance element, respectively, and a second diode connected between an emitter and base terminals of the bipolar transistor, wherein an anode of the second diode is connected to the emitter terminal of the bipolar transistor and the source terminal of the MOSFET, and a cathode of the second diode is connected to a cathode end of the first photodiode array.