Active solid-state devices (e.g. – transistors – solid-state diode – Housing or package – Insulating material
Patent
1997-09-23
1999-06-01
Williams, Alexander Oscar
Active solid-state devices (e.g., transistors, solid-state diode
Housing or package
Insulating material
257680, 257778, 257774, 257738, 257712, 257720, H01L 2302, H01L 2334, H05K 720
Patent
active
059090570
ABSTRACT:
Provided is a single-piece integrated heat spreader/stiffener which is bonded to the substrate and die in a semiconductor package following electrical bonding of the die to the substrate, a packaging method using the integrated heat spreader/stiffener, and a semiconductor package incorporating the integrated heat spreader/stiffener. In a preferred embodiment, the integrated heat spreader/stiffener is a piece of high modulus, high thermal conductivity material shaped to attach over a die on the surface of a packaging substrate. The heat spreader/stiffener is equipped with a plurality of apertures to provide access to the top surface of the die for adhesive to bond the heat spreader/stiffener to the die, and to its perimeter to provide access for dispensation of underfill material between the die and the substrate. Once the adhesive and underfill materials are in place, the adhesive and underfill resins are cured by heating. A ball grid array (BGA) process may then be used to apply solder balls to the underside of the substrate for subsequent bonding of the package to a circuit board for use.
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McCormick John P.
Patel Sunil A.
LSI Logic Corporation
Williams Alexander Oscar
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