small via

Community PCB Design
1

Hi

I am designing (with eagle) a very small pcb 1mm width over 8 high mm with 1mm thin board

holding R0201 on layer 1 and pads on layer 16

I need very small via (two of them) with very small drill (0.2 mm) and total size

any ideas how I can do it in eagle

thanks

2

Find a company that can make such a board, first.

3

and still I would like to know how to modify via to be much smaller

4

It’s probably in the documentation. Have you tried reading it?

5

yes I tried, it will be nice of you if you can help with something useful

like example or link to follow

thanks

6

I don’t use Eagle. It would only take a few seconds with the Pulsonix software I use.

7

natanel:
yes I tried, it will be nice of you if you can help with something useful

like example or link to follow

Open up Eagle.

Press the “F1” key.

Type “via” in the box.

Press “Enter”.

8

I don’t think leon is upset with you ‘personally’ as he is a very helpful poster.

But you just hit being the 100th person who asked a question that is easily answered in the docs or by doing a simple google search.

Did you try ‘eagle pcb add via’ ???

btw, why/how do you get 16 layers in a 1mm board?

9

Eagle has a strange way of identifying layers. It is a two layer board.

10

I tried to doc but probably did not get it right

my board is grid size 0.2 mm

when writing in the command line at the board window

CHANGE DRILL diameter 0.2 (from eagle help “Via diameter”)

I get an error invalid pad, I know I am doing some syntax wrong

but I don’t now how to do it right

  • the pcb is two layer 1 and 16, this is the default setup in the light version
11

Again, as Leon_heller stated, find a fab house that can drill that small. Thats crazy small. It’s slightly larger than a human hair. You would have to go into eagle and create a new drill size. I don’t know how to do this but you could find out if you RTFM. Then after you do that, when you create a via select that size from the drop down list. This is all crazy though and its not worth the crazy excessive cost.

12

Again, as Leon_heller stated, find a fab house that can drill that small. Thats crazy small. It’s slightly larger than a human hair. You would have to go into eagle and create a new drill size. I don’t know how to do this but you could find out if you RTFM. Then after you do that, when you create a via select that size from the drop down list. This is all crazy though and its not worth the crazy excessive cost.

13

If you can find someone to drill that small, then it is very simple to set the size in Eagle. All you need to is type in the drill size in the box labeled “Drill:” when you are placing the via. It will then remember that drill size.

If you want to change existing vias, click the Spanner on the left, hover over Drill, then click … at the bottom. Type in your required drill size, and then one by one click on each via you want to change.

14

thanks all

I am able to change the drill size but not the diameter size

bellow 30 mil it just the same size (30 mil)

is this some kind of limit in the DRC (my DRC->restring->Vias->outer 10mil min, 25%, 20 mil max)

I don’t need the pcb manufacture (yet), just to show a concept.

15

Thats the one.

Basically, it says that the width of the anular ring will be 25% of the drill size. However if this is more than 20mil, it wil be fixed to 20 mil, and if it is less than 10mil, it wil be fixed to 10mil

If you have a 0.2mm hole, that is 8mil. 25% of 8mil is 4mil, which is less than 10, so it uses 10mil. Giving you a total diameter of 10 + 8 + 10 = 28mil smallest size.

If you make the min value smaller, say 5 mil, you would be able to make a 5+8+5=18mil diameter via.

Hope that makes sense.

16

yes, now it make sense

little bit strange for me that eagle limit you by outer size and let you config diameter

giving you to do the math.

but again eagle have a strange control behavior

thanks