Alan B. Pearce <A.B.Pearce <at> rl.ac.uk> writes:

> Not quite right. Vbe(sat) for a darlington is typically about 0.6V higher
> for a darlington than a single transistor, unless the collector of the first
> transistor is brought out separately. Think about the way a typical 3 lead
> darlington is connected - the Vce(sat) of the output device will be Vce(sat)
> of the first transistor plus Vbe(sat) of the second transistor - because if
> the voltage was any lower then there is not enough voltage to drive the base
> of the second transistor.
<SNIP>

Thanks Alan for the clarificatioin.  I can see it clearly now.

Sergey



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