6 Replies Latest reply on Feb 16, 2018 8:55 AM by k.r.kabaleeswaran

copper not flood in between two vias?? How to maintain copper width 3.6mil in b/w vias ?

k.r.kabaleeswaran Feb 12, 2018 6:13 AM

Dear Team,

i am working in BGA Component,BGA pitch is 0.65mm.BGA fantout is Via in Pad.in my design, i need to maintain copper widht is 3.6mil for plane layer under the BGA area.here i post the image file. Drill to drill need to maintain 7mil; trace to via clearance is 4mil;if 3.6mil running in between i can able to meet below image rules.but i need to assign the these rules for copper.if i flood the copper in under BGA area for below image rules copper is not flood between 2 holes or 2 vias.

contraint rules attached below

if i set the above rules copper to copper disconnected happened in between 2 holes or 2 vias.

The following queries are aries below.

1.why copper disconnected happen in inner layer.

2.is PADS software is not allowed below 5 mil copper widht ??

kindly update any one.it is very critical. Need to solve it ??

1. Re: copper not flood in between two vias?? How to maintain copper width 3.6mil in b/w vias ?

vinayarora Feb 12, 2018 7:25 AM (in response to k.r.kabaleeswaran)

Reduce copper pour width.and grid.
Check Anti-pad size of the via.
Minimum requirement is 16 mil over the drill size.
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2. Re: copper not flood in between two vias?? How to maintain copper width 3.6mil in b/w vias ?

k.r.kabaleeswaran Feb 12, 2018 10:05 PM (in response to k.r.kabaleeswaran)

Hi vinay,

Thanks for your reply.i implemented your suggestion. if followed I got hatch like this. I need solid plane only. this is the requirement from customer. if I increase the line width only I got right ? if I increase copper will not flood in between 2 holes or 2 vias. Kindly reply for this
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3. Re: copper not flood in between two vias?? How to maintain copper width 3.6mil in b/w vias ?

kbak Feb 13, 2018 3:17 AM (in response to k.r.kabaleeswaran)

Hi
If you get hatched copper it is because your copper hatch grid and copper line width does not fit.
I always set 'Copper Hatch Grid' to '0'.
Then PADS automatically adjust the copper pour to be solid.

You can also set the copper hatch grid per copper area.
regards Klaus
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4. Re: copper not flood in between two vias?? How to maintain copper width 3.6mil in b/w vias ?

k.r.kabaleeswaran Feb 13, 2018 4:26 AM (in response to k.r.kabaleeswaran)

Hi Klaus,

Thanks for your reply.one more thanks for urgent help.one more point if add line width is 5 mil, copper will not flow in between 2 vias or 2 holes.i need to set the width is 1 which i highlighted in image file below.
i kept hatch grid 1 as shown in below image

it is working now.

Thanks again.
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5. Re: copper not flood in between two vias?? How to maintain copper width 3.6mil in b/w vias ?

vinayarora Feb 13, 2018 4:38 AM (in response to k.r.kabaleeswaran)

Still looks that Antipad size is too big.
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6. Re: copper not flood in between two vias?? How to maintain copper width 3.6mil in b/w vias ?

k.r.kabaleeswaran Feb 16, 2018 8:55 AM (in response to k.r.kabaleeswaran)

Hi vinay,
Thanks for your reply. I changed everything it is working..
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