> > >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

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