BJT Replace MOS for Switching in Digital circuit

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Dear All:

I want to use BJT to Replace MOS for Switching in Digital circuit for Cost Down,
Now i use 2N7002,Which Type BJT can i use to Replace it?
Please give me some advice ,Thanks a lot.

Eddy
03/18
 

2N7002 ( **broken link removed** ) can be replaced by: BC639, BD139, ZTX653, ZTX453
or SMT BCP56, FMMT491, FMMT493, FZT653 ...
 

How can i know the BJT Turn on and Turn off Time?
Thanks,it is imponent for digital.
 

From transistor data sheet you can read Ton and Toff times, for example: FZT653 (**broken link removed**) has Ton=80ns and Toff=1200ns ..
 

Anyone has any suggestion?
Thanks,
I need your help
 

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