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Why is the TS83102G0 CBGA Package specified as CBGA 148 although it has 152 pins?

Post Date:
07/16/07 
Question:
Why is the TS83102G0 Package specified as CBGA 148 although it has 152 pins?
Answer:
The TS83102G0 package is specified as a CBGA 148 because, although there are 152 “physical” connection points, there are only 148 “electrical” points to be considered.

Indeed, 4 balls are not connected to the die.