PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/minimum-trace-width-spacing-for-bga_topic1556.html
(plugged from top open on bottom) if not near a pad on the bottom, and VIA18D9A26PTB plugged and cover with solder mask from both sides
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556.html
(plugged from top open on bottom) if not near a pad on the bottom, and VIA18D9A26PTB plugged and cover with solder mask from both sides
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/minimum-trace-width-spacing-for-bga_topic1556_post6321.html
(plugged from top open on bottom) if not near a pad on the bottom, and VIA18D9A26PTB plugged and cover with solder mask from both sides
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/topic1556&OB=DESC.html
(plugged from top open on bottom) if not near a pad on the bottom, and VIA18D9A26PTB plugged and cover with solder mask from both sides
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/topic1556&OB=ASC.html
(plugged from top open on bottom) if not near a pad on the bottom, and VIA18D9A26PTB plugged and cover with solder mask from both sides
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic1556&OB=ASC.html
(plugged from top open on bottom) if not near a pad on the bottom, and VIA18D9A26PTB plugged and cover with solder mask from both sides
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7093a-btc-qfn-solder-mask-defined-thermal-pad_topic2154_post11220.html
. Here is the Land Pattern in the CAD tool illustrating the Solder Mask layer on top. In the CAD tool, Solder Mask areas in Yellow are
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
. Here is the Land Pattern in the CAD tool illustrating the Solder Mask layer on top. In the CAD tool, Solder Mask areas in Yellow are
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/solder-masks_topic1380.html
. But if you insist, in Altium (and other PCB design tools), the only way I know how to Gang Mask is to add copper on the solder mask layer
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