[PCB_FORUM] Re: micro vias and blind vias

Thanks Richard, we are planning on doing a board with a .5mm bga. Since i have 
never dealt with blind or micro vias i thought i could read a little before I 
start asking questions to our board house. I read a little last night and the 
definition I get for a micro via is a via less than 5 mils drill. True? 
Blind via i know is a via that can go into a internal layer and make a 
connection. My question is "Do I create via as usual and make a pad on L02 and 
top layer and call out that via where ever I may need that particular via? Do i 
need to be consistent with layer names? I use L02, L02, L04... but the other 
cad person uses Top, Ground, Power, Bottom. When he tries to use th vias i 
created will it work on his board? These are beginner questions and i don't 
know if a board house will answer these types of questions. They'll probably 
point me to the cadence user group. I best check out the suggested website and 
better i learn more. Anyone want to send me a pad stack?

Thanks Sam
"richard moffat" <richard.moffat@xxxxxxxxxxxxxxxxxxx> wrote:

>Sam
>
>Different vendors will be able to cope with different materials.  You really 
>need to contact the vendor to see what prepregs their laser (or whatever) can 
>punch through for blind vias, and what aspect ratios they can do with the 
>technology they have on site.
>
>Richard
>
>
>
>>>> SjChar3@xxxxxxxxxxxx 15/02/2006 9:10 a.m. >>>
>
>Group: Looking for reading material for micro vias and using blind vias. Can 
>anyone recommend good sites.
>Thanks
>Sam
>
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