CAD schematics (.sch) can be generally opened and printed as PDF (or occasionally in 3D PDF) in various PCB layout editors such as the P-CAD or Eagle. This is a good way of sharing PCB layouts, but .pdf files cannot be further edited or used for CAD/CAE purposes.
Convert CAD schematics file to Adobe Portable document format.
We have found 3 software records in our database eligible for .sch to .pdf file format conversion.
Microsoft Windows software - convert sch to pdf on Windows
Old PCB layout modeling utility
Convert from sch file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned sch to pdf. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
High quality PCB design software
A modeling suite used to design printed circuit boards