# Aspect ratio of through hole via **URL:** \ **Category:** Design for Manufacturing\ **Created:** [December 3, 2023, 9:32am UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657 "2023-12-03T09:32:04Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Sajal\_ee](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@Sajal\_ee](https://sierraconnect.protoexpress.com/u/Sajal_ee)\ **Post date:** [December 3, 2023, 9:32am UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657/1 "2023-12-03T09:32:05Z")
I read that aspect ratio of TH plating via is between 10:1 to 6:1 I was trying to calculate the dielectric height and via pad diameter for these aspect ratios If the via pad is 6 mil and the dielectric height is 60 mil then the aspect ratio of the via is 10:1, right ? If the via pad is 10 mil and the dielectric height is 60 mil then the aspect ratio of the via is 6:1, right ? It look like that manufacturing 10:1 via is more expansive and difficult then 6:1 via, is that correct ? If yes then 4:1 via is further more easier to manufacture or have bigger via pad compared to 6:1 via. The via pad size will be then 15 mil in 4:1 via if the dielectric height is 60 mil. ---
**Author:** ![atar.mittal](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/atar.mittal/32/49_2.png) [@atar.mittal](https://sierraconnect.protoexpress.com/u/atar.mittal)\ **Post date:** [December 4, 2023, 7:25pm UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657/2 "2023-12-04T19:25:11Z")
> [@Sajal\_ee](#): > > If the via pad is 6 mil and the dielectric height is 60 mil then the aspect ratio of the via is 10:1, right ? The via pad has nothing to do with the aspect ratio. It’s the hole size. ---
**Author:** ![atar.mittal](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/atar.mittal/32/49_2.png) [@atar.mittal](https://sierraconnect.protoexpress.com/u/atar.mittal)\ **Post date:** [December 4, 2023, 7:25pm UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657/3 "2023-12-04T19:25:36Z")
> [@Sajal\_ee](#): > > If the via pad is 10 mil and the dielectric height is 60 mil then the aspect ratio of the via is 6:1, right ? Again, that’s the hole size. ---
**Author:** ![steve.carney](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/steve.carney/32/50_2.png) [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)\ **Post date:** [December 4, 2023, 7:45pm UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657/4 "2023-12-04T19:45:12Z")
> [@Sajal\_ee](#): > > It look like that manufacturing 10:1 via is more expansive and difficult then 6:1 via, is that correct ? It doesn’t work like this. 10:1 and 6:1 vias are through-holes. What impacts the cost of manufacturing is having smaller holes or blind/buried vias because they take more time to fabricate. Below 6 mils, your fab house will probably use laser drilling, which is more expensive. ---
**Author:** ![steve.carney](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/steve.carney/32/50_2.png) [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)\ **Post date:** [December 4, 2023, 8:49pm UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657/5 "2023-12-04T20:49:59Z")
This is a video of our mechanical drilling. https://fast.wistia.net/embed/iframe/c59msdym0c ---
**Author:** ![Sajal\_ee](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@Sajal\_ee](https://sierraconnect.protoexpress.com/u/Sajal_ee)\ **Post date:** [December 5, 2023, 8:47am UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657/6 "2023-12-05T08:47:25Z")
Is that true 10:1 has smaller via hole compared to 6:1 ? If yes than manufacturing 10:1 via is more expansive and difficult then 6:1 via, correct ? ---
**Author:** ![steve.carney](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/steve.carney/32/50_2.png) [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)\ **Post date:** [December 5, 2023, 4:32pm UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657/7 "2023-12-05T16:32:27Z")
Like I said, 10:1 and 6:1 are aspect ratios, not via sizes. That doesn’t impact the cost of manufacturing. ---
**Author:** ![steve.carney](https://sea2.discourse-cdn.com/sierraconnect/user_avatar/sierraconnect.protoexpress.com/steve.carney/32/50_2.png) [@steve.carney](https://sierraconnect.protoexpress.com/u/steve.carney)\ **Post date:** [December 6, 2023, 4:33pm UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657/8 "2023-12-06T16:33:36Z")
Just for reference, this is how we laser drill. https://fast.wistia.net/embed/iframe/8fx3bqaayh ---
**Author:** ![Sajal\_ee](https://avatars.discourse-cdn.com/v4/letter/s/d26b3c/32.png) [@Sajal\_ee](https://sierraconnect.protoexpress.com/u/Sajal_ee)\ **Post date:** [December 6, 2023, 5:48pm UTC](https://sierraconnect.protoexpress.com/t/aspect-ratio-of-through-hole-via/657/9 "2023-12-06T17:48:40Z")
Thanks. I have watched the videos.