>> I'm finding it hard to search transistors by Vbe ON voltage,
>> basically I need a NPN with a fairly high sensitivity, ie saturates
>> at a small voltage on the base.

As Herbert says, bipolar silicon transistors all have essentially the 
same turn on voltage.

Some conventional FETs have Vth below the turn on voltage for 
bipolars.

There is a new process available (actually new technology) that allows 
FETs to have arbitrarily low turn on voltages.

Also. You can bias a bipolar transistor so a small input voltage turns 
it in.

Tell us how you are trying to do an unknown thing and we may not be 
able to help.
Tell us what you want to achieve and we'll tell you how to achieve it.


        RM 

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