On Fri, 2006-05-12 at 14:29 +0100, Edward Cooper wrote:
> Hi all
> 
> 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.
> 
> Any ideas, nothing to specialised though, just cheap and fairly  
> available.

Since the forward voltage of the PN junction in an NPN transistor is
largely dependent on the material used, you're not going to be able to
find something much less then "normal" when sticking with silicon.

There are other options, germanium transistors used to exist, I don't
know how common they are these days.

If you're just switching something then low Vgs MOSFETs would make a
good solution.

TTYL

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