-5/0 volt to 0/5 volt logic levels?
You could try digital isolators :



http://www.analog.com/en/products/interface-isolation/isolation/quad-channel-standard-isolators/adum240e.html

http://www.ti.com/lit/ds/symlink/iso7840.pdf

Not very small, and probably more expensive than discrete transistors.

There are dozens of references.