[sdiy] 4N25 SMT?

[Simon Gatrall]

I'm trying to squeeze all the extra space that I can out of an 
adapter that I'm working on, and I would like to find a SMT version 
of the common optocoupler that is used for MIDI - the 4N25.  I'm much 
more of a mechanical engineer than an electrical engineer so all of 
the specs for these guys don't mean too much to me.  I know that the 
4N25 is available in a bent lead DIP version that makes it 
pseudo-SMT, but it is still huge.  There are other photo-transistor 
optocouplers that don't use the base of the transistor and are in 
small 4-pin flat packages (e.g. Fairchild makes the HMA121).  Is 
there any reason that these wouldn't work?  What are the important 
specs?

-s!mon