Patent ID: 9693445
Date: 2017-06-27
CPC Classifications: H01L,H05K

Claim:
1. A printed circuit board (PCB), comprising: a copper seed layer; at least one dielectric layer provided on the copper seed layer; a single primary thermal via having a single first through-hole in the at least one dielectric layer ending at the copper seed layer, and a first copper portion filled in the first through-hole and directly contacting the copper seed layer, thereby enabling a direct electrical and thermal connection between the copper seed layer and the single primary thermal via; a plurality of secondary thermal vias disposed peripherally around the single primary thermal via, each of the secondary thermal vias having a second through-hole in the at least one dielectric layer and a second copper portion filled in the second through-hole, the second copper portion directly contacting the copper seed layer at one end, thereby enabling a direct electrical and thermal connection between each of the plurality of secondary thermal vias and the copper seed layer allowing for each of the plurality of secondary thermal vias to be electrically and thermally connected to the single primary thermal via and other secondary thermal vias of the plurality of secondary thermal vias; and a mounting portion provided within a surface area of the first copper portion for mounting a semiconductor device thereon, wherein an exposed area of the single primary thermal via is larger than an exposed area of each of the secondary thermal vias.