PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/blind-via-with-smaller-solder-mask-opening_topic1110.html
with small solder mask opening. The drill for this blind via is 0.1mm, pad is 0.3mm and the solder mask opening is 0.2mm. These vias are under the BGA
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/blind-via-with-smaller-solder-mask-opening_topic1110.html
with small solder mask opening. The drill for this blind via is 0.1mm, pad is 0.3mm and the solder mask opening is 0.2mm. These vias are under the BGA
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/topic1110&OB=DESC.html
: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5182 Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 18 Sep 2013 at 7:04pm All vias under BGA's need to be "Tented" with solder mask to prevent solder bridging under the component
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic1110&OB=ASC.html
with small solder mask opening. The drill for this blind via is 0.1mm, pad is 0.3mm and the solder mask opening is 0.2mm. These vias are under the BGA
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154_post11220.html
. Then they inserted vias through the Thermal Pad and the holes sometimes intersected the Paste Mask. The thermal pad solder mask was 1
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154_post10556.html
. The thermal pad solder mask was 1:1 scale of the thermal pad. During reflow the paste would melt and travel down the via holes. The PCB designer might have created a fabrication note to plug the holes on the Thermal Pad not knowing that it would increase cost by 10 - 15
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2154&OB=ASC.html
. Then they inserted vias through the Thermal Pad and the holes sometimes intersected the Paste Mask. The thermal pad solder mask was 1
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_mounting-holes-with-vias_topic939.xml
;We need to wait until Jeff gets back from vacation the first week of September. It's on our "to do list". Mounting Holes With Vias
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/mounting-holes-with-vias_topic939_post4164.html
) Test Points, Rectangle: TP + Pad Length X Pad Width (1 place left of decimal and 2 places right of decimal) Fiducials: FID + Pad Size X Solder Mask Size Mounting Holes
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic939&OB=ASC.html
) Test Points, Rectangle: TP + Pad Length X Pad Width (1 place left of decimal and 2 places right of decimal) Fiducials: FID + Pad Size X Solder Mask Size Mounting Holes
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Phone: (770) 538-0411
