The 66224-308 from Micropac Industries is a Space Qualified Optocoupler with Forward Voltage 0.8 to 1.7 V, Isolation Voltage 1000 V, On-State Collector Current 1 to 5 mA, Power Consumption 300 mW(Power Dissipation), Resistance 10 Ohms. Tags: Surface Mount. More details for 66224-308 can be seen below.