help me

Discussion in 'General Electronics Chat' started by labanita88, Oct 5, 2007.

  1. labanita88

    Thread Starter Guest

    hi everyone...
    it's 1st time 4 me 2 be here...but i have a question and hope that anyone has answer helps me...

    in BJT when base current equals zero..there is collector current..of small value names collector saturation current..why this happens????

    thnx in advance
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    Not "saturation" current, but "leakage" current. "Saturation" current is when the transistor is turned all the way on.

    Leakage current happens because there is no such thing as a perfect transistor. The transistor has a very high resistance when turned off, but not an infinite resistance.