Sourcing and Sinking Current


Joined Aug 7, 2008
This is a real can of worms as different explanations are in use. I like the one above but think it is in the minority or is it the other way around ? Sometimes the term is avoided by using " high level output current or low level output current ".


Joined Jul 18, 2013
It generally means the output switching the +ve is Sourcing, example is a open collector PNP, if the output switches to common, then is is sinking, an example is a open collector PNP.
An input with the same qualities has the same label.
This is a PDF that explains it in the PLC/Industrial control context, which is common to most applications.



Joined Mar 14, 2008
What is the meaning or sourcing and sinking current?
What is the concept behind the terms?
Source means to supply current from a power source to a grounded load.
Sink means to conduct current from a source to the common/ground point.
From that I would think the concept behind these terms for those functions would be apparent.