transistor with base diode

Discussion in 'The Projects Forum' started by simran.javed, Jun 22, 2009.

  1. simran.javed

    Thread Starter New Member

    Feb 16, 2009
    1
    0
    I was going through one circuit, and I realized there that there is a diode present between Collector and base of a darlington pair PNP transistor.
    Can anyone let me know what is the significance of this diode.
     
  2. StayatHomeElectronics

    Well-Known Member

    Sep 25, 2008
    864
    40
    Can you post the circuit on the forum?
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    It's fairly common to see a diode between the base and emitter on the input to clamp the voltage to Vee, and more common to see a diode between the collector and emitter of the output. Some Darlingtons have a pair of diodes in series to limit Vbe on the input.

    However, I don't recall seeing a diode between the collector and base.
     
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