Thermally enhanced and mechanically balanced flip chip package a

Details Thermally enhanced and mechanically balanced flip chip package a Thermally enhanced and mechanically balanced flip chip package a

1998-05-15

2000-08-15

Potter, Roy

Active solid-state devices (e.g., transistors, solid-state diode

Combined with electrical contact or lead

Flip chip

257706, 257737, H01L 2348

Patent

active

061040932

ABSTRACT:
A method of making a flip chip package that maintains flatness over a wide temperature range and provides good heat dissipation is described. A laminate substrate is electrically connected to electrical contacts disposed on a chip and underfill material is applied between the soldered connections. A body, for example an uncured dielectric material, is applied to the chip, the laminate substrate, a thermally conductive member or combinations thereof, and thermally conductive member is disposed adjacent to the surface of the chip that is opposite the surface connected to the laminate substrate. The body is extruded between the chip and the thermally conductive member. The thickness of the thermally conductive member is determined by balancing the stiffness and the CTE of both the thermally conductive member and the laminate substrate, and the length and width of the thermally conductive member may vary but are at least the size of the corresponding length and width of the chip.

REFERENCES:
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IBM Technical Data Bulletin vol. 37 N. 6A Jun. 1994 p. 197.

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