Patent ID: 6750534
Filing Date: 2004-06-15
Classification: H01L,H05K

Abstract:
A ball grid array assembly having a metal heatsink, the ball grid array assembly comprising:a square or rectangular shaped heat sink having a thickness, whereby said heat sink further has a die attach surface in addition to having a marking surface, whereby heat sink identification data is typically provided on said marking surface of said heat sink; and an indentation provided in said marking surface, whereby said indentation is used to determine orientation of said BGA array assembly, wherein an indentation has been provided in said marking surface of said square or rectangular shaped heat sink, whereby said indentation is preferably located at one or more corners of said square or rectangular shaped heat sink, whereby said indentation is a removal of said heat sink material that penetrates said heat sink to a depth of between about 30 and 70% of the thickness of said square or rectangular shaped heat sink.