transistor

Can i use This transistor in place of **broken link removed**
the case pin is not used so the case pin shouldn't be an issue

I cannot seen to find the bfw10 and need to know if i can use the mpf4392 in its place

Probably not. The bfw10 is a low-noise UHF amplifier and the mpf4392 is a switching transistor with no spec for noise.

It really depends on the circuit. What do you intend to use it for?