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0.5mm pitch BGA fan out

Hi, I am using 0.5mm pitch BGA in my design ,which is having land diameter 0.35mm . I want to use via(PTH) in pad technology , the fan out concept shown in figure (using 6mil drill on the 0.4mm pad ) .I have few concern reg via in pad technology 1)whether it is able to fabricate Via (6mil drill ) for 1.6mm PCB , any aspect ratio problem? 2)how much reliable this technology during assembling If anybody done used this concept pls suggest Regards, Girish Kumar

Nagaraj Shanmu over 15 years ago

create two via padstack say V_10x20(normal pth via) in pad designer you can assign drill symbol(under parameters tab, Drill/Slot symbol) for this padstack.
for via in pad create padstack say vip_10x20 and use different drill symbol - you can standardize all VIP padstack drill symbols by dedicating a Drill figure only for VIP pads say "Diamond" ( all diamond drill figure used is for VIP)
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girish over 15 years ago

Its working , two separate list coming in the drill chart for the same drill(say 10mil) with different drill symbol.
But if you see the .drl file all 10mil hole will be clubbed together . I think defining the different drill size(as mentioned earlier ) is the only way to distinguish b/t VIP & PTH in .drl file .

Thanks for ur intrest
Regards,
Girish Kumar
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