Metal working – Method of mechanical manufacture – Heat exchanger or boiler making
Patent
1994-04-06
1996-03-12
Thompson, Gregory D.
Metal working
Method of mechanical manufacture
Heat exchanger or boiler making
B23P 1526
Patent
active
054975476
ABSTRACT:
Method and apparatus for improving the cooling of a molded package assembly for one or more integrated-circuit dies, each of which is attached to a die-attach paddle portion of a lead frame. The improved package includes a molded-plastic package body which is formed around the lead frame and the attached integrated-circuit die. The package body has one or more through-holes formed through it for passage of air, where the air currents are drawn by convection or forced through the through-hole for cooling the integrated-circuit die attached the die-attach paddle. The die-attach paddle has a corresponding hole formed in it and the through-hole formed in the package body is located adjacent to the hole in the die-attach paddle to form a through-channel through the lead frame and the molded plastic body for convection cooling. The die-attach paddle is covered with molded plastic material so that the die-attach paddle is not exposed in the through-channel. The through-hole formed in the molded-plastic body has inwardly projecting portions which form cooling fins. The lower surface of the package body is spaced apart from the ends of the external leads to provide a standoff space from which cooling air is drawn.
REFERENCES:
patent: 4839774 (1989-06-01), Hamburgen
patent: 5105259 (1992-04-01), McShane et al.
King Patrick T.
Thompson Gregory D.
VLSI Technology Inc.
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