Abstract: A method for fabricating a semiconductor system starts with providing a first component including a first semiconductor chip attached to a pad of a first metal leadframe made of a first metal sheet of high thermal conductivity. A second component including a second semiconductor chip attached to a pad of a second metal leadframe made of a second metal sheet wire-bondable on both surfaces is provided. The second component is encapsulated in a polymeric housing leaving un-encapsulated the lead surfaces facing away from the second chip. The polymeric housing of the second component is attached to the first chip using a layer of low thermal conductivity, whereby the un-encapsulated lead surfaces face away from the first chip. Bonding wires are connected to the un-encapsulated surfaces of the second component leads to the leads of the first component.

Abstract: A semiconductor system (100) comprises a first component including a first semiconductor chip (110) attached to the pad (120) of a leadframe made of a first metal sheet of high thermal conductivity, and a second component including a second semiconductor chip (140) attached to the pad (150) of a leadframe made of a second metal sheet wire-bondable on both surfaces. Wires (160) connect chip (140) to leads (151) at the surface (151a) facing the chip. A polymeric housing (170) encapsulates chip (140) and wires (160), leaving un-encapsulated the lead surface (151b) facing away from chip (140). Housing (170) is attached to the first chip (110) using a layer (180) of low thermal conductivity, and lead surfaces (151 b), facing away from the first chip (110), are connected by wires (131) to leads (121) of the first metal leadframe.