Patent ID: 6737298
Filing Date: 2004-05-18
Classification: H01L

Abstract:
A method for anchoring a heat spreader of a Plastic Ball Grid Array (PBGA) package to the surface of an underlying substrate of the PBGA package, comprising the steps of:(a) providing a substrate for a PBGA package, said substrate having been provided with heat spreader anchor posts over the surface thereof, said heat spreader anchor posts being separated by a first distance; (b) providing a heat spreader for a PBGA package, said heat spreader having a first and a second surface, said first surface facing said substrate, said first surface having been provided with a layer of electrically non-conductive material, said heat spreader comprising: (i) a horizontal portion, being parallel with the surface of said substrate of said PBGA package; (ii) heat spreader stand-off features; (iii) said heat spreader stand-off features having a contact surface providing contact between said heat spreader and said substrate; (iv) said contact surface of said heat spreader stand-off features having been provided with openings there-through; and (v) said openings provided through said contact surfaces being separated by a distance of said first distance; (c) aligning said anchor posts provided over the surface of said substrate with said openings provided through said contact surfaces of said stand-off features of said heat spreader; and (d) inserting said anchor posts provided over the surface of said substrate into said openings provided through said contact surfaces of said stand-off features of said heat spreader, creating anchor posts protruding through said openings provided through said contact surfaces.