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

    Distinguished Member

    Sep 25, 2008
    953
    53
    Can you post the circuit on the forum?
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,189
    1,741
    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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