M63840FP/KP/P is a Darlington Transistor Array with 8 circuit output source type Clamp Diode constructed with PNP Transistors and NPN Transistors and is a semiconductor integrated circuit capable of large current drive with small input currents. Between the output terminal and the COM terminal, a Clamp Diode is connected as a spike killer. Also, a leak cut of 100kΩ is connected to input, and input noise resistance has improved over the existing line.