Chip Packaging Stress Relief by Use of an Overflow Reservoir
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
A technique is described whereby an overflow reservoir is used to provide stress relief to a semiconductor chip mounting, when thermal grease is used in heat dissipation. Thermal grease is used effectively in electronic circuit assembly and is applied between the semiconductor chip and the mounting cap to provide heat conduction to a heat sink or to convect the heat to the ambient air. The semiconductor chip 1, as shown in Fig. 1, is mounted via solder balls 2 onto a substrate 3. Dabs of thermal grease 4 are placed between chip 1 and module cap 5. The module cap 5 is positioned so that a desired gap 6 is attained between chip 1 and cap 5. Pressure is applied to spread the thermal grease 4 from the center of the chip 1 to the periphery.