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The 80umx80um PAD size for COB package

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chang830

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hi,
My project used 0.5um CMOS process and the design rule gives 90umx90um PAD size recommendations. For area considerations, my pad is decreased to 80Umx80um and the chip will be COB(Chip on board) packaged.

Would any one pls. give me advcie if it have any risks?

Thanks
 

Dear Chang:

In choosing PAD sizes, one needs to discuss with package company to discuss about the PAD size and the PAD pitch. There are different limitations for different packages.

In my experiment, 80*80 is OK for COP.
 

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    chang830

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