Abstract: There is disclosed an optoelectronic coupling device for transmitting digital signals from an input to an output, which input and output are electrically isolated from each other. An input stage includes an input for receiving digital input signals from an incoming signal line and an output. The input stage is connected to an optoelectronic coupling circuit comprising luminescent diodes and phototransistors arranged adjacent to respective ones of the luminescent diodes. Either the collectors or the emitters of both phototransistors are commonly connected to a first voltage source. The other leads of the phototransistors form outputs of the optoelectronic coupling circuit. An output stage, connected to these outputs, includes an operational amplifier having an output, a non-inverting input and an inverting input. Each of the non-inverting and inverting inputs are connected to one of the outputs of the optoelectronic coupling circuit.