See Brady Products
4 Pin Transistor Output, Single Optocoupler
16 Pin Transistor Detector, Quad Optocoupler
16 Pin AC Input, Quad Optocoupler
6 Pin Darlington Output, Non-base Lead, Single, Optocoupler
6 Pin Transistor Output, Non-base Lead , Single Optocoupler
6 Pin Transistor Detector, Single, Optocoupler
6 Pin Transistor Detector, High Density, Single Optocoupler