[PCB_FORUM] Re: micro vias and blind vias
- From: "richard moffat" <richard.moffat@xxxxxxxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Thu, 16 Feb 2006 11:53:06 +1300
It'll pay to check I got the best standard. IPC-2315 is for microvias as
well. There's possibly some overlap.
>>> sjchar3@xxxxxxxxxxxx 16/02/2006 10:25 a.m. >>>
Thanks Richard, I'll be talking to them soon and thanks for the IPC reference
book. Going to see boss about some money.
-----Original Message-----
From: richard moffat <richard.moffat@xxxxxxxxxxxxxxxxxxx>
To: icu-pcb-forum@xxxxxxxxxxxxx
Sent: Thu, 16 Feb 2006 09:43:20 +1300
Subject: [PCB_FORUM] Re: micro vias and blind vias
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#333333;}Hello Sam
I misread your original email. I thought you were looking for good materials,
ie. what type of prepregs and cores to use. (A recent excercise we went
through for isolation requirements.)
Many places consider a microvia <= to 8mils, 8mil being the smallest practical
mechanical drill.
If you get your company to shell out for IPC-2226, it's a good reference with
really good graphics. As mentioned, Happy Holden puts out good articles as
well.
I'd still talk to your fab house though, just to confirm their capabilities.
Once you have the stackup designed, have them approve it before serious routing.
Cheers,
Richard
>>> jwages@xxxxxxxxx 16/02/2006 4:01 a.m. >>>
Last time I used blind laser vias, I ran them from top to n-1 and n-2.
(Top to 2nd lyr-pwr plane & 3rd lyr-gnd plane) and also from bottom
layer to the same bottom minus 1 and minus 2 layers, which were also
power and gnd planes. The N-1 via was a 4 mil laser drill, and the N-2
was an 8 mil drill. The hole is actually V shaped and that's what the
fabricator wants for best connectivity. I did this with Sanmina-SCI
fabricating the boards, but I think this i
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of
SjChar3@xxxxxxxxxxxx
Sent: Wednesday, February 15, 2006 9:54 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [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
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