Source/sink

Discussion in 'General Electronics Chat' started by memo4, May 19, 2014.

  1. memo4

    Thread Starter New Member

    May 19, 2014
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    0
    I've got an auxiliary port with 0 - 3.3V and 4mA source/sink. What does this 4mA source/sink mean?
     
  2. #12

    Expert

    Nov 30, 2010
    16,295
    6,807
    4 ma of current can flow either into or out of the port without damaging anything.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,123
    3,048
    The term refers to current. The port can supply (source) current from its positive pole or it can accept (sink) current to its negative pole. 4mA is enough to light an LED and not much else.
     
  4. #12

    Expert

    Nov 30, 2010
    16,295
    6,807
    Let me put that in perspective. 4 ma can drive a transistor to get a lot more current, if that's what you need.

    If your aux port is going to be the input for another IC, it will probably work, but if it's going to be the output to the human world, it's pretty weak.
     
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