Components and methods with nested leads
AssigneeTessera, Inc.
InventorIlyas Mohammed
Life of this patent
Estimating the term…
Abstract
A component for fabricating microelectronic assemblies has numerous curved leads on a surface. Each lead has a first anchor end fixed to the body of the component, a second tip end which can be bonded to a contact on a mating component and lifted away from the component body, and an elongated main portion which is bent away from the component body in the lifting action. The first anchor end of each lead is nested within the curved portion of another lead, so as to provide an extraordinarily compact arrangement suitable for use with components having closely spaced contacts as, for example, a semiconductor chip or wafer having a contact pitch less than 500 microns. The leads may be disposed in pairs, with the first anchor end of each lead encompassed by the main portion of the other lead in the same pair.
Claims32
A component for making microelectronic assemblies comprising:
- (a) a body having a surface;
- and
- (b) a plurality of nested leads extending over said surface, each of said nested leads having first and second ends and an elongated main section extending between said ends, the main section of each said nested lead being curved to encompass and partially surround an interior area of said surface, the first end of each said nested lead being disposed within the interior area encompassed by another one of said nested leads, wherein the first end of each said nested lead is an anchor end fixed to said body and the second end of each said nested lead is a tip end displaceable relative to said body, said leads being connected to said body so that said tip ends can be released from said body by a predetermined treatment which leaves the anchor ends fixed to said body.
A component comprising:
- (a) a base having a surface, whereby location on said surface is defined by a coordinate system including a +X direction, a −X direction opposite to said +X direction, a +Y direction perpendicular to said X directions and a −Y direction opposite to said +Y direction;
- and
- (b) a plurality of pairs of nested leads extending over said surface, the leads of each said pair including a first lead and a second lead, each said nested lead having a first end, a second end and an elongated main portion extending between such ends, the main portion of each said nested lead being curved to encompass and partially surround the first end of the other lead in the same one of said pairs, the second lead of each said pair having its first end offset from the first end of the first lead in the +Y direction, wherein the first end of each said nested lead is an anchor end fixed to said base and the second end of each said nested lead is a tip end, said leads being connected to said base so that said tip ends can be released from said base by a predetermined treatment which leaves the anchor ends fixed to said base.
A method of making connections comprising the steps of:
- (a) providing first and second elements and a plurality of generally planar nested leads connected between said elements, each of said nested leads having a first anchor end fixed to the first element, a second end displaceable relative to said first element and connected to the second element and an elongated main section extending between said ends, the main section of each said nested lead being curved to encompass and partially surround the first anchor end of another one of said nested leads;
- and then
- b) in a lifting Step, moving said first and second elements away from one another with a component of motion in a vertical direction normal to the plane of the leads so as to bend said nested leads into a vertically-extensive disposition.
Dependencies are inferred from the claim text.