日本語
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Why no gold on some BGAs on Iphone PCB?
668
1
Oct 30.2019, 17:03:05
I got this Iphone PCB in recent days - does anyone know why some BGA footprints are OSP and not gold ?
By best guess is it's to do with the metallurgy of the solder balls used on some of the devices
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A****min
Nov 06.2019, 09:16:16
Gold can in some cases cause embrittlement when used in combination with certain alloy pins/balls.
If the device has that issue for whatever reason then you would not gold flash those pads.
