The MOC3021M is a two-way thyristor optocoupler manufactured by Youtai. It has a nominal DC input voltage of 1.18V and is capable of switching 100mA. It has a surge voltage rating of 5,000V and can handle up to 400V peak. It has a maximum operating temperature of +100°C and a minimum operating temperature of -55°C. It is packaged in a 6-pin DIP format and is RoHS compliant. It is designed to provide an isolated signal output between the input and output circuits.