Diodes Inc - SPICE Models, Schematics, and Simulator

Diodes Incorporated has a section on their website for all of the SPICE models they have. If the SPICE model for your part is not available, there is a form you can use towards the bottom of the page to request one.

Here is the link:

Diodes Incorporated also has a free downloadable simulator you can use, with a list of example schematics.

Here is the link: