onsemi Optoisolators - Transistor, Photovoltaic Output - MOC8021 MOC8021

The MOC8021 is a photodarlington optocoupler with a gallium arsenide infrared LED coupled to a silicon darlington phototransistor, designed for electrical isolation between circuits. It is packaged in a 6-DIP (0.300", 7.62mm) through-hole configuration. The device features a minimum current transfer ratio of 1000% at 10 mA input current and 5 V collector-emitter voltage, and provides an input-output isolation voltage of 5300 Vac(rms). Operating temperature ranges from -55°C to +100°C, with storage temperatures up to +150°C. It meets VDE 0884 isolation standards and is rated for a continuous collector current of 150 mA. The part has no base connection and is suitable for applications including solid state relays, I/O interfaces, and impedance-matching systems.