Microelectronics unit mounting with multiple lead bonding
First Claim
1. A component for forming connections to a microelectronic unit comprising:
- (a) a flexible dielectric top sheet having oppositely facing top and bottom surfaces and holes extending through the top sheet;
(b) a plurality of electrically conductive terminals mounted on said top surface of said top sheet;
(c) a compliant dielectric support layer underneath said top sheet, said support layer having a bottom surface remote from said top sheet; and
(d) a plurality of flexible, electrically conductive, elongated leads connected to said terminals through said holes in said top sheet and extending side-by-side downwardly from said terminals through said support layer, each said lead having a lower end adjacent the bottom surface of said support layer, said lower ends of said lead having means for bonding to contacts on a microelectronic unit when the component is engaged with a unit under predetermined temperature and pressure conditions, and thereby electrically connecting said terminals with the contacts on the surface, said support layer surrounding and supporting said leads.
1 Assignment
0 Petitions
Accused Products
Abstract
A component for mounting semiconductor chips or other microelectronic units includes a flexible top sheet with an array of terminals on it, and with flexible leads extending downwardly from the terminals. A compliant dielectric support layer surrounds the leads, holding the lead tips in precise locations. The leads are desirably formed from wire such as gold wire, and have eutectic bonding alloy on their tips. The component can be laminated to a chip or other unit under heat and pressure to form a complete subassembly with no need for individual bonding to the contacts of the chip. The subassembly can be tested readily and provides compensation for thermal expansion.
415 Citations
23 Claims
-
1. A component for forming connections to a microelectronic unit comprising:
-
(a) a flexible dielectric top sheet having oppositely facing top and bottom surfaces and holes extending through the top sheet; (b) a plurality of electrically conductive terminals mounted on said top surface of said top sheet; (c) a compliant dielectric support layer underneath said top sheet, said support layer having a bottom surface remote from said top sheet; and (d) a plurality of flexible, electrically conductive, elongated leads connected to said terminals through said holes in said top sheet and extending side-by-side downwardly from said terminals through said support layer, each said lead having a lower end adjacent the bottom surface of said support layer, said lower ends of said lead having means for bonding to contacts on a microelectronic unit when the component is engaged with a unit under predetermined temperature and pressure conditions, and thereby electrically connecting said terminals with the contacts on the surface, said support layer surrounding and supporting said leads. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A component for forming connections to a microelectronic unit comprising:
-
(a) a dielectric structure having top and bottom surfaces; (b) a plurality of electrically conductive terminals disposed adjacent said top surface; (c) a plurality of electrically conductive, elongated leads connected to said terminals and extending downwardly from the terminals through said dielectric structure, each said lead having a lower end at said bottom surface; and (d) an sealant distributed on said bottom surface, said sealant being adapted to seal the bottom surface of the dielectric structure to a microelectronic unit when the component is juxtaposed with the unit and subjected to predetermined temperature and pressure conditions, said lower ends of said leads including means for bonding to contacts on the surface of the unit under said predetermined temperature and pressure conditions and thereby electrically connect said terminals with the contacts on the surface of the unit. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
-
Specification