PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_stencil-window-pane-design-example-for-qfn_topic2481.xml
;I saw some information from IPC-7525 but i really don't understand those formulas. It would be possible to give me a simple example for a 3 x 3 cm square thermal pad? 
Blackfox Training Institute, LLC | https://www.blackfox.com/7-benefits-of-surface-mount-technology-smt/
7 Key Benefits Of Surface Mount Technology (SMT) - Blackfox Skip to content Blackfox Premier Training & Certification +1 (888) 837-9959 Search: Course Calendar Course Calendar 2024 IPC Certification IPC Courses IPC-A-600 IPC 7711/7721 IPC-A-6012 IPC 7711/7721 Recert IPC-A-610 IPC/WHMA-A-620 IPC-A-610 Recert IPC/WHMA-A-620 Recert J-STD-001