any one can help me .
i need an equivalent for 2n3962(transistor pnp) in 4-20ma circuit using hcnr201.
regards
vell

 

http://www.fairchildsemi.com/ds/PN/PN4249.pdf

 

And if you can't find a PN4249, root around on this page:
http://www.classiccmp.org/rtellason/transistors-2n.html

Lots of potential substitutes. Have a ball!