Semiconductor package having non-ceramic based window frame

Abstract From the Canadian patent

A semiconductor for power transistors and the like has a heat sink flange with at least one die mounted thereon, a non-ceramic window frame mounted thereon adjacent to the die, and a plurality of leads mounted on the window frame and electrically coupled to the die by wire bonds. The non-ceramic based window frame is thermally matched to copper or other highly conductive material typically used for the flange, to facilitate assembly of the semiconductor package at high temperatures. The non-ceramic based window frame is flexible and is thermally matched to the highly conductive flange so as to expand and contract at a rate similar to the flange to prevent failure during assembly of …