Patent ID: 7258808
Filing Date: 2007-08-21
Classification: H01L,Y10T

Abstract:
1. A method for manufacturing a heat spreader for use in a ball grid array package, the method comprising: providing an insulating board having a thermal conductivity that is at least as high as that of a material selected from the group consisting of AlN, BeO, and Al forming an upper ground metal layer having a thermal conductivity that is at least as high as that of a material selected from the group consisting of copper and copper alloy and a lower metal layer on an upper and lower surface, respectively, of the insulating board, the insulating board and upper metal layer together conducting heat from a semiconductor chip when it is operated in the ball grid array package; forming a region configured to attach to a semiconductor chip by removing only a central portion of the lower metal layer of a size sufficient to receive a semiconductor chip while leaving the remainder of the layer surrounding the central portion; cutting a first groove through the upper metal layer to a first predetermined depth of the insulating board; cutting a second groove through the lower metal layer to a second predetermined depth of the insulating board, wherein the first and second grooves are substantially aligned; forming a protection layer on the upper metal layer; and cutting out the heat spreader defined by the first and second grooves.