公开(公告)号：US11244892B2

公开(公告)日：2022-02-08

申请号：US16550775

申请日：2019-08-26

Applicant: STMicroelectronics Pte Ltd

Inventor： Daniel Yap ,  Hung Meng Loh

IPC: H01L23/495 ,  H01L23/498 ,  H01L23/31 ,  H01L21/48

Abstract: A method of forming a solder connection includes forming a solder mask on a thermal pad of a printed circuit board. The solder mask leaves unmasked portions of the thermal pad and forming the solder mask includes forming a plurality of mask stripes extending from edges of each unmasked portion towards a center of the unmasked portion. The method includes depositing solder paste on the unmasked portions of the thermal pad and placing an exposed thermal pad of an integrated circuit package on the solder paste deposited on the thermal pad of the printed circuit board. The method includes forming a solder connection by heating the solder paste between the unmasked portions of the thermal pad on the printed circuit board and the exposed thermal pad of the integrated circuit package.

公开(公告)号：US20200075475A1

公开(公告)日：2020-03-05

申请号：US16550775

申请日：2019-08-26

Applicant: STMicroelectronics Pte Ltd

Inventor： Daniel Yap ,  Hung Meng Loh

IPC: H01L23/498 ,  H01L23/31 ,  H01L23/495 ,  H01L21/48

Abstract: A method of forming a solder connection includes forming a solder mask on a thermal pad of a printed circuit board. The solder mask leaves unmasked portions of the thermal pad and forming the solder mask includes forming a plurality of mask stripes extending from edges of each unmasked portion towards a center of the unmasked portion. The method includes depositing solder paste on the unmasked portions of the thermal pad and placing an exposed thermal pad of an integrated circuit package on the solder paste deposited on the thermal pad of the printed circuit board. The method includes forming a solder connection by heating the solder paste between the unmasked portions of the thermal pad on the printed circuit board and the exposed thermal pad of the integrated circuit package.