Sounds interesting. Neither Fairchild or National have data on the 2N5951.
Sounds like your setting Vgs to zero, right? That then results in 8mA?
Over what voltage range?

THANKS!

Harold


>> 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?
>
> Hi Harold,
>
> Would you settle for 8 mA? The 2N5951 (NS, Fairchild) I just tried works
> great. My other choice at hand, the MPF102, runs at 15 mA.
>
> Tie gate to either drain or source, use that as the more negative side.
>
> 2N5951 available everywhere, in small quantities at Jameco.
>
> Cheers,
>
> Bob
>
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