| 摘要 |
A fabrication method for a BGA or LGA package includes a low-cost metal leadframe with internally extended leads. I/O attach lands can be placed at any location on the metal leadframe, including the center of the package. An I/O attach land can be fabricated at any position upon an extended lead (e.g., near the center of the package). During fabrication of the package, an isolation saw cut to the bottom of the package can be used to electrically disconnect the leadframe circuit from the peripheral extension traces to prevent tampering with the IC die by probing the edge metal traces.
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