Sourcing and Sinking Current

Discussion in 'General Electronics Chat' started by Abhinavrajan, Aug 22, 2016.

  1. Abhinavrajan

    Thread Starter Member

    Aug 7, 2016
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    What is the meaning or sourcing and sinking current?
    What is the concept behind the terms?
     
  2. Robin Mitchell

    Well-Known Member

    Oct 25, 2009
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  3. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    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 ".
     
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  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    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.
    Max.
     
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  5. crutschow

    Expert

    Mar 14, 2008
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    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.
     
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  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    The links in #2 and #4 pretty much explains that if any one is in doubt.
    Max.
     
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  7. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
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    Or the use of a sign: -10 mA or 10 mA.

    Although it's usually in the form: The output can (source/sink) 10 mA. Values can be asymmetrical.
     
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