Patent ID: 6213747
Filing Date: 2001-04-10
Classification: H01L,H05K

Abstract:
A mold assembly for encapsulating a die and leadframe of a semiconductor device in a polymeric package by transfer molding, comprising:a top mold plate having a pressure-resisting top and sides;a generally planar, pressure-resisting bottom mold plate configured to be sealably joined to said top mold plate, said top mold plate and said bottom mold plate together forming a mold cavity with a top, a bottom, side walls and end walls, said top and bottom mold plates configured to suspend a die and leadframe by said leadframe within said mold cavity for injection of encapsulant thereinto,wherein at least one of said walls has an inner surface castellated with vertically directed, alternating grooves and columns for forming columns and grooves, respectively, in an external surface of said molded package.