SMTA International Conference Proceedings

Cavity Board SMT Assembly Challenges

Authors: Dudi Amir and Brett Grossman
Company: Intel Corporation
Date Published: 10/14/2018   Conference: SMTA International

Abstract: There is a continuing trend for notebook computers, cell phones and other handheld electronic devices to become thinner and thinner. One of the solutions to reduce the thickness is mounting the tallest components into a cavity in the printed circuit board (PCB). In this method, the lands of the package that needed a height reduction are fabricated in a recess in the mother board. Paste printing and components placement take place on the surface of the board and in the cavity.

The intent of this study is to identify the challenges related to assembly of a package into a cavity on the board, and establish the best known method for SMT assembly success. The paper will examine a System-in-Package (SiP) BGA (ball grid array) package assembly into a cavity in a mother board. The paper will describe the challenges facing the PCB design and fabrication. It will share the SMT assembly method and the impact of different board suppliers, stencil technology and squeegee design. It will discuss the warpage of the PCB and its effect to SMT results. Finally, the paper will summarize the challenges and provide best known method to overcome them to have a successful assembly in a cavity board.

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