The 66138-009 from Micropac Industries is a Space Qualified Optocoupler with Forward Voltage 0.7 to 1.7 V, Isolation Voltage 1000 V, On-State Collector Current 2 to 10 mA, Power Consumption 300 mW(Power Dissipation), Resistance 10 Ohms. Tags: Surface Mount. More details for 66138-009 can be seen below.