Pnp transistor voltage/current graph

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SUMMARY

The discussion focuses on the behavior of current in a PNP transistor as voltage is increased. Specifically, once the applied base voltage exceeds the barrier potential of the p-n junction (0.7V for silicon and 0.3V for germanium), the current stabilizes and becomes constant. This phenomenon occurs because there is no further voltage drop across the p-n junction after reaching the threshold, leading to a steady state in current flow.

PREREQUISITES
  • Understanding of PNP transistor operation
  • Knowledge of semiconductor physics, specifically p-n junctions
  • Familiarity with barrier potential values for silicon and germanium
  • Basic concepts of voltage and current relationships in electronic circuits
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Electronics students, electrical engineers, and hobbyists interested in transistor behavior and circuit design.

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in pnp transistor after some time on increasing voltage why the current become constant ?
 
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XuFyaN said:
in pnp transistor after some time on increasing voltage why the current become constant ?
which voltage you are talking about? if it is base voltage then it might be follows.
when applied voltage is given to transistor the current increases slowly.when applied voltage crosses the barrier potential of p-n junction(for si=0.7v and ge=0.3v) then the current becomes constant as no voltage drop across p-n junction.
 

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