At 09:55 PM 2/8/2006 +0200, you wrote:


>On Wed, 8 Feb 2006, Wouter van Ooijen wrote:
>
> >> But they actually specify the maximum forward voltage (at a certain
> >> current) in maximum ratings sections.
> >
> > I checked http://www.fairchildsemi.com/ds/1N/1N4148.pdf, it does not
> > specify this. Only the maximum current.
> >
> >> We probably could conclude from this
> >> that going over this in a dynamic situation takes the diode out of the
> >> specified operating range.
> >
> > The 'this' is missing, so no conclusion can be drawn...
> >
> > I might be a sloppy reader, but I can't even find a switch-on time
> > specification, which would be the root issue here. So again, no data =>
> > no conclusions :(
>
>Ton should be about 5 nsec for 1N4148.

So, at 150mV/ns dv/dt at the 2N3904 collector, we've got an extra
overshoot of 0.75V.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
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