Vishay SFH610-A2 Transistor Output Optoisolator from Rapid Online – Rapid Electronics Ltd.Vishay/Isocom Transistor/Darlington Output Optoisolators – Vishay SFH610-A2, A transistor output optoisolator with a high current transfer ratio and low CTR degradation Vishay SFH610-A2 Transistor Output Optoisolator