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.