The 66177-619 from Micropac Industries is a Space Qualified Optocoupler with Forward Voltage 0.7 to 1.7 V, On-State Collector Current 2 to 2.8 mA, Power Consumption 300 mW(Power Dissipation), Collector-Base Breakdown Voltage 45 V, Collector-Emitter Breakdown Voltage 40 V. Tags: Surface Mount. More details for 66177-619 can be seen below.