Pnp transistor voltage/current graph

[XuFyaN]

in pnp transistor after some time on increasing voltage why the current become constant ?

 

[amaresh92]

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.