Sealed semiconductor device with positional deviation between upper and lower molds
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 8, 2000
Grant Date -
N/A
app pub date -
Mar 4, 1998
filing date -
Mar 6, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a semiconductor device having a resin-encapsulated structure, the width of an upper-mold portion of a package in a direction parallel to inner leads is made smaller than that of a lower-mold portion of the package so that the upper-mold portion cannot extend further towards outer leads than the lower-mold portion. Therefore, the amount of the positional deviation between an actual package region and a prospective package region is small and tiebars can be arranged close to the prospective package region in a lead frame. Since a fixed distance is ensured between the tiebars and the actual package region after molding, damage to the package is prevented during tiebar cutting. Since the amount of extension of any resin burr is small, a deflashing step is omitted.
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