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: 7 Post Options Post Reply Quote naresh11 Report Post Thanks(1) Quote Reply Topic: PCB Via Terms and Applications Posted: 11 Jun 2015 at 11:11pm Via Tenting: a term is used by many fabrication shops
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. Solder Mask Covered: a pad or via (via tenting) is covered with solder mask. Mask Plugged Via: for this specific measures are taken to ensure the via is plugged and sealed with mask and the annular ring is covered
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_smallest-via-hole-that-can-use-a-3-mils_topic2497.xml
. Then after the drill oversize and the layer to layer tolerance you still need to have 1 mil annular ring. IPC Class 3Hole = 8 mil (0.20 mm)Pad = 20 mil (0.50 mm)IPC Class 2Hole = 8 mil (0.20 mm)Pad = 18 mil (0.45 mm)The via hole tolerance would be
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/smallest-via-hole-that-can-use-a-3-mils_topic2497_post10288.html
. Then after the drill oversize and the layer to layer tolerance you still need to have 1 mil annular ring. IPC Class 3 Hole = 8 mil (0.20 mm) Pad = 20 mil (0.50 mm) IPC Class 2 Hole = 8 mil (0.20 mm) Pad = 18 mil (0.45 mm) The via hole tolerance would be
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/smallest-via-hole-that-can-use-a-3-mils_topic2497_post10288.html
. Then after the drill oversize and the layer to layer tolerance you still need to have 1 mil annular ring. IPC Class 3 Hole = 8 mil (0.20 mm) Pad = 20 mil (0.50 mm) IPC Class 2 Hole = 8 mil (0.20 mm) Pad = 18 mil (0.45 mm) The via hole tolerance would be
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/topic2497&OB=DESC.html
. Then after the drill oversize and the layer to layer tolerance you still need to have 1 mil annular ring. IPC Class 3 Hole = 8 mil (0.20 mm) Pad = 20 mil (0.50 mm) IPC Class 2 Hole = 8 mil (0.20 mm) Pad = 18 mil (0.45 mm) The via hole tolerance would be
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2497&OB=ASC.html
. Then after the drill oversize and the layer to layer tolerance you still need to have 1 mil annular ring. IPC Class 3 Hole = 8 mil (0.20 mm) Pad = 20 mil (0.50 mm) IPC Class 2 Hole = 8 mil (0.20 mm) Pad = 18 mil (0.45 mm) The via hole tolerance would be
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/RSS_ipc2221-2222-and-throughhole-pad-stacks_topic2586.xml
. The via hole quantity typically out numbers the terminallead holes and PCB designers want to make the via annular ring the minimumvalue per the manufacturing Class that they must meet
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc2221-2222-and-throughhole-pad-stacks_topic2586_post10872.html
. The via hole quantity typically out numbers the terminal lead holes and PCB designers want to make the via annular ring the minimum value per the manufacturing Class that they must meet
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc2221-2222-and-throughhole-pad-stacks_topic2586_post10876.html
. The via hole quantity typically out numbers the terminal lead holes and PCB designers want to make the via annular ring the minimum value per the manufacturing Class that they must meet
