Stacked die assembly having reduced stress electrical interconnects
First Claim
Patent Images
1. An assembly comprising:
- a plurality of die in a stack mounted on a support and electrically interconnected to the support, wherein a face of a first die in the stack is adhesively bonded to a face of an adjacent die;
a zone near a corner of a die in the stack having one or more sacrificial pad positions and one or more traces overlying the sacrificial pad positions and contacting the support; and
a pad in one of the sacrificial pad positions is insulated by a dielectric material and is thereby left free of electrical connection with the overlying trace.
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Abstract
Methods are disclosed for improving electrical interconnection in stacked die assemblies, and stacked die assemblies are disclosed having structural features formed by the methods. The resulting stacked die assemblies are characterized by having reduced electrical interconnect failure.
226 Citations
24 Claims
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1. An assembly comprising:
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a plurality of die in a stack mounted on a support and electrically interconnected to the support, wherein a face of a first die in the stack is adhesively bonded to a face of an adjacent die; a zone near a corner of a die in the stack having one or more sacrificial pad positions and one or more traces overlying the sacrificial pad positions and contacting the support; and a pad in one of the sacrificial pad positions is insulated by a dielectric material and is thereby left free of electrical connection with the overlying trace. - View Dependent Claims (2, 3, 4, 5)
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6. An assembly comprising:
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a plurality of die in a stack mounted on a support, the stack including a first die and a second die and being electrically interconnected to the support; a first underfill fillet extending outwardly from a first die sidewall of the first die and overlying a first surface; a second underfill fillet extending outwardly from a second die sidewall of the second die and the second underfill fillet having a sloping surface that overlies a surface of the first die extending beyond the second die sidewall, and a portion of the second underfill fillet overlies a portion of the first underfill fillet; a first set of interconnect traces formed on the sloping surface of the second underfill fillet, each interconnect trace formed by depositing a conductive material in flowable form along a trajectory over pads of at least one of the die or the support to be connected thereby. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification