Wafer level chip size packaged chip device with an N-shape junction inside and method of fabricating the same
First Claim
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1. A wafer level chip size packaged chip device with a N-shape junction comprises:
- a substrate having formed thereon a silicon chip, with a plurality of compatible pads disposed at the periphery of said chip on said substrate;
packaging structure for receiving and packaging said chip and said substrate;
a plurality of solder bumps each attached to a bottom surface of said packaging structure; and
metal leads to enable electrical connection between said compatible pads and said solder bumps;
wherein, in addition to the lateral side, a portion of both top and bottom sides of each said compatible pad is exposed so as to form a N-shape junction between said compatible pad and said lead.
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Abstract
The present invention provide a wafer level chip size packaged chip device with a N-shape junction at which external leads electrically connect to peripheral arrayed compatible pads and a method of fabricating the same. In the wafer level chip size package, with such an n-shape junction instead of a conventional T-shape junction observed in Shellcase type wafer level chip size package technology, electrical connections between compatible pads and external leads are more reliable due to larger connection area than the counterpart in the T-shape junction.
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5 Claims
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1. A wafer level chip size packaged chip device with a N-shape junction comprises:
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a substrate having formed thereon a silicon chip, with a plurality of compatible pads disposed at the periphery of said chip on said substrate; packaging structure for receiving and packaging said chip and said substrate; a plurality of solder bumps each attached to a bottom surface of said packaging structure; and metal leads to enable electrical connection between said compatible pads and said solder bumps; wherein, in addition to the lateral side, a portion of both top and bottom sides of each said compatible pad is exposed so as to form a N-shape junction between said compatible pad and said lead. - View Dependent Claims (2, 3, 4, 5)
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Specification