PC817X4NSZ1B is a 4-Channel Voltage-Output Type Photocoupler produced by Sharp. It has an isolation voltage of 5000Vrms, a control voltage range of 4.5 to 20V, a mutual transmission frequency of 0 to 10kHz, and a maximum sink current of 40mA/channel. It includes a compact 4-channel Darlington output transistor, and its digital input is CMOS/TTL-compatible. The product also offers a common output for two channels, and its package size is approximately 47% smaller than those of single-channel photocouplers. This product is used in a wide range of industrial applications and control systems, including inverters, CNC machines and programmable logic controllers.