Typical Via sizes

Community PCB Design
1

I ran into a problem with a board house and my via’s annular rings.

My typical via is a 0.020 hole with a ring of 0.030.

my traces are typically 0.010 & 0.012.

what via sizes are you guys running with ?

2

the default DRC on Eagle has a minimum of 24 mils so that’s what I use.

3

so if i understand, 24 mills would be like a 20mill hole with a 44 mill annular ring ?

4

seulater:
I ran into a problem with a board house and my via’s annular rings

What problem?

5

seulater:
so if i understand, 24 mills would be like a 20mill hole with a 44 mill annular ring ?

Or, a 20mil hole after plating and a 24mil diameter ring.

I use 24mil holes with a 28.8mil diameter ring; the ring

is 1.2 times the drill.

What layout software are you using?

6

WOW!, that leaves you with a ~2mil annular ring.

I am using Labcenter.

7

I use 15 mil hole vias with a 30 mil ring with out trouble and they are plenty small. Using Labcenter as well.

8

ohararp, Hows it going. Long time no talk!

if a 20mil hole with a 30mil ring has worked for me in the past i will just leave well enough alone. no sence that i can see to change things to drop to a 15,16,or 17 mil hole.

9

seulater:
WOW!, that leaves you with a ~2mil annular ring.

Correct. The min drill for BatchPCB is 20mil. So I bumped

the smallest drill to 24mil to avoid bot rejects.

The default drill on my EAGLE installation - which hasn’t been

customized, is 19.685mil (or 0.5mm). This is too small to pass

the BatchPCB bot.

This geometry allows two adjacent vias to be on a 50mil grid,

and pass 20mil DRC clearance and the 8mil BatchPCB bot.