# Open Drain vs Open Collector

Is there a practical difference between Open Drain and Open Collector outputs, or are the terms used interchangably? If they are indeed different, what are the contexts where each is advantageous? My hunch is that they are functionally equivalent, but Open Drain is implemented with FET technology while Open Collector is implemented with BJT technology.

That's right, open collector is BJT, open drain (C)MOS. In logic circuits where currents are low the saturation voltage of the BJT may be a bit higher than the voltage drop due to $R_{DS(ON)}$ for the FET, but it still will be much lower than the maximum voltage for a logic low.