A simplified modeling technique for finite element thermal analysis of a plastic SOIC package

The purpose of this paper is to introduce an approximate analysis method which is incorporated with an ANSYS finite element program for thermal finite element analysis of a surface mount plastic package mounted on a PC board. A numerical example is given in the paper to demonstrate the application of this technique, and the numerical prediction agrees well with the experimental results. This proposed technique can be applied to solve other thermal problems such as the analysis of any surface mount or through hole type of plastic package mounted on a PC board or can be used for determining junction temperatures of multiple power components mounted on a board.