The IS49 from ISOCOM is a Space Qualified Optocoupler with Forward Voltage 1.8 V, Continuous Current 50 mA, Collector-Emitter Dark Current 100 uA, Collector-Emitter Saturation Voltage 0.22 V, Emitter-Collector Breakdown Voltage 70 V. Tags: Surface Mount. More details for IS49 can be seen below.