Patent ID: 9583367
Date: 2017-02-28
CPC Classifications: H01L

Claim:
1. A method of forming a semiconductor device, the method comprising: attaching a first substrate to a die attach region of a second substrate, the second substrate having traces formed thereon, the second substrate having a keep-out region around a periphery of the die attach region, and a periphery region around a periphery of the keep-out region, the second substrate having a protective layer overlying the traces in the periphery region, an area of the keep-out region being between about 5% and about 18% of an area of the first substrate, wherein the protective layer has linear sides adjacent the keep-out region, the linear sides intersecting to form a corner; and forming an underfill interposed between the first substrate and the second substrate, the underfill extending over the traces located in the keep-out region.