If you only have a .LIB or .MOD file from a manufacturer (like SourceForge PSpice Models ), you can import these as third-party SPICE models directly into Proteus. Step 2: How to Install the Library in Proteus
Developers often share complete modules. For instance, the NirisonFabrice SG3525 PWM module provides both simulation files and PCB designs. download sg3525 library for proteus
Sites like EDABoard host community-built library files that have been tested in real simulation environments. If you only have a
Capable of driving semiconductor devices directly (up to 50mA). download sg3525 library for proteus