The H11A617BSD is a transistor output optocoupler from Fairchild/ON Semiconductor. It is an obsolete (EOL) product that comes in a 4-SMD package. The optocoupler has a minimum DC current transfer ratio of 63% at 10mA and a maximum DC current transfer ratio of 125% at 10mA. The isolation voltage of the H11A617BSD is 5300Vrms, and it has a maximum output voltage of 70V. The channel output current is 50mA, and the continuous forward current is 50mA. The switching turn-on and turn-off time is not specified, but the rise and fall time is 2.4μs. The optocoupler has a forward voltage of 1.35V and a Vce saturation (max) of 400mV. It is suitable for use in isolators.