Hi,

Can anyone share his experience on gold ball bonding on COB with immersion silver finishings. What sort of silver thickness to ensure a good bonding strength of min 3.5 gf?

We are using a 1 mil thick gold wire on a 6 to 20 microinch silver thickness and encountered difficulty in achieving the min bonding strength in wire pull.

Thanks for all inputs.

Best regards,

David.

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