ACWWong
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As loose has said, QFN48 encompasses alot of packages, each with slightly different dimensions, construction, diepad/paddle size etc....
and then there are different bonding houses with again different rules for downbonds clearance, max die size, max bond angles etc.
but having said that, a safe rule of thumb is 0.5mm for a down bond is something most bonding houses would easily be able to make.
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