Device for evaluating reliability of interconnect wires
First Claim
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1. A device used in evaluating reliability of interconnect wires comprising:
- a substrate;
an insulating film formed on said substrate; and
a hole chain formed in said insulating film and comprising a plurality of holes electrically connected in sequential order by interconnection segments;
wherein a center-to-center distance between adjacent holes of said plurality of holes is not less than x times a Blech length, where x is a rational number greater than 1; and
wherein said center-to-center distance corresponds to one value falling within a range of hole-to-hole spacings, when all parameters of a predetermined failure distribution, used for lifetime estimation of said hole chain in a predetermined failure mode and indicated in the form of a function using said hole-to-hole spacings as variables, are determined independently of said hole-to-hole spacings.
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Abstract
Center-to-center spacings (L1, L2, L3, L4, . . . ) of adjacent holes (5) in a hole chain (6) are set to values not less than five times a Blech length. This setting causes two parameters (MTF and σ) of a logarithmic normal distribution used as a failure distribution for EM lifetime prediction to be constant independently of the center-to-center spacings, permitting stable EM lifetime prediction of the hole chain. Further, setting the length of each of extension interconnect wires (2) to a value not greater than the Blech length prevents voids from being created in the extension interconnect wires (2).
73 Citations
12 Claims
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1. A device used in evaluating reliability of interconnect wires comprising:
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a substrate; an insulating film formed on said substrate; and a hole chain formed in said insulating film and comprising a plurality of holes electrically connected in sequential order by interconnection segments; wherein a center-to-center distance between adjacent holes of said plurality of holes is not less than x times a Blech length, where x is a rational number greater than 1; and wherein said center-to-center distance corresponds to one value falling within a range of hole-to-hole spacings, when all parameters of a predetermined failure distribution, used for lifetime estimation of said hole chain in a predetermined failure mode and indicated in the form of a function using said hole-to-hole spacings as variables, are determined independently of said hole-to-hole spacings. - View Dependent Claims (2, 3)
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4. A device used in evaluating reliability of interconnect wires comprising:
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a substrate; an insulating film formed on said substrate; a pad formed in said insulating film and partially exposed; a hole chain formed in said insulating film and comprising a plurality of holes electrically connected in sequential order by interconnection segments; and an extension interconnect wire formed in said insulating film for establishing an electrical connection between said pad and a first end of said hole chain which is adjacent said pad; wherein a length of said extension interconnect wire is not greater than a Blech length. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. A device used in evaluating reliability of interconnect wires comprising:
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a substrate; an insulating film formed on said substrate; a hole chain formed in said insulating film and comprising a plurality of holes electrically connected in sequential order by interconnection segments; a pad; and an extension interconnect wire for establishing an electrical connection between said pad and a first end of said hole chain which is adjacent to said pad; wherein a length of said extension interconnect wire is not greater than a Blech length; and wherein a center-to-center spacing between adjacent ones of said holes is greater than said Blech length.
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Specification