Just curious, why the two-terminal restriction?
To me, it sounds like a dandy application for a TL431
(but then you've got a third terminal and two
resistors to deal with...)

> I'm loooking for a two terminal constant current device that could be put
> between an LED and a variable DC supply to hold the LED current at 5mA as
> the supply varies over a 0-10V range (recognizing we're not going to get
> it at 0V, but I'd like the widest range possible). So far i've found the
> Central Semiconductor CCLM5750 which is a nominal 5.750mA, but it takes
> 4.5V to get 80% of the rated current. Anyone have other ideas?
>
> THANKS!
>
> Harold

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