Area array package with non-electrically connected solder balls
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United States of America Patent
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Jul 13, 2004
Grant Date -
N/A
app pub date -
Mar 20, 2003
filing date -
Jan 30, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An area area package includes a plurality of solder balls not used as electrical connectors. These non-connected solder balls, or 'dummy balls,' provide protection to solder balls connected to live pins and therefore increase reliability of the area array package. The dummy balls may be placed in the corners, along the diagonals or in other high stress location on the area array package. To further increase reliability, a continuous copper ball land pad may be used to connect each group of corner dummy balls. Continuous copper pads help to reduce stress on the dummy balls. For center-depopulated BGA packages, an array of dummy balls may be used in the center of the package to prevent substrate bending and improve drop test reliability.
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