The 66177-817 from Micropac Industries is a Space Qualified Optocoupler with Forward Voltage 0.7 to 1.7 V, On-State Collector Current 0.5 to 0.7 mA, Power Consumption 300 mW(Power Dissipation), Resistance 10 Ohms, Capacitance 2.5 pF. Tags: Surface Mount. More details for 66177-817 can be seen below.