Patent ID: 7205659

Claim:
A microelectronic assembly comprising: a first microelectronic element having a contact bearing face and at least one contact accessible at the contact bearing face; a second microelectronic element opposing said first microelectronic element, said second microelectronic element having a first surface including at least one lead extending over the first surface; a first fusible material engaging the at least one contact of said first microelectronic element; a second fusible material engaging the at least one lead, wherein one of said first and second fusible materials has a higher melting temperature and one of said first and second fusible materials has a lower melting temperature; said first and second microelectronic elements being juxtaposed with one another so that said first and second fusible materials are in substantial alignment with one another, wherein one of said first and second fusible materials is in a liquid state and one of said first and second fusible materials is in a solid state, wherein said first microelectronic element includes a semiconductor wafer comprising a plurality of semiconductor chips, said wafer being severable for providing individual packages comprising one or more of said semiconductor chips electrically interconnected with at least a region of said second microelectronic element.