At 08:04 PM 5/26/2006 +0200, you wrote:
> > > >Also, surprisingly (at least for me) TIP120 has a
> > protection diode built-in!
>
> > > No, it does not.
>
> > I thought that it does not too, but at least the equivalent
> > circuit in
> > datasheet shows it.  http://www.fairchildsemi.com/ds/TI/TIP120.pdf
>
>Indeed. But I don't see a single parameter referring to that diode, so
>it might well have a forward drop voltage of 300kV and/or a maximum
>forward current of 12pA. But I hope it has a reasonable allowed reverse
>voltage ....
>Wouter van Ooijen

The only way it would act as a protection diode when switching an
inductive load is if it had a *low* reverse breakdown, and broke
down before the transistor.

>Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
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