The CSM100 from ISOCOM is a Space Qualified Optocoupler with Forward Voltage 1.6 V, Continuous Current 40 mA, Collector-Emitter Dark Current 100 uA, Collector-Emitter Saturation Voltage 0.22 V, Operating Temperature -55 to 125 Degree C. Tags: Surface Mount. More details for CSM100 can be seen below.