Isocom is2801 4 optoisolator 4 channel so 16 isocom is2801 4 a 4 channel optoisolator using an ir led with an npn photodiode high current transfer ratio and high density mounting make this device suitable for applications such as hybrid substrates requiring high density mounting programmable controllers test and measurement equipment etc isocom is2801 4 optoisolator 4 channel 50 600 ctr 3kv so 16