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March 2005

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Subject:
From:
Happy Holden <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 14 Mar 2005 15:47:06 -0500
Content-Type:
text/plain
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text/plain (136 lines)
Victor,
You can find 23 papers and presentation on microvias in the "Technical
Resources" area of the Web Site:  www.westwoodpcb.com.

Happy Holden




"Victor G. Hernandez" <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
03/14/2005 01:40 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
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Subject
Re: [TN] Microvias & plating






Fellow techNett,

   Can some one share articles and/or studies conducted on Microvias &
Plating?

Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kerry Bode
Sent: Wednesday, March 09, 2005 12:04 PM
To: [log in to unmask]
Subject: Re: [TN] Microvias & plating

Hello,

The micro-via with dimples is fairly common and is deployed in many high
reliability products today. The micro-via should be of a size that does
not
create a void or out gassing condition during assembly. I have seen
studies
that if the via dimple is greater than .006 in diameter it becomes a
concern
during assembly. Solder paste typically will fill in the dimple. Japan
PWB
fabricators have developed a method to plate the vias closed, however
it's
costly.

-----Original Message-----
From: Michaloski, Denise [mailto:[log in to unmask]]
Sent: Wednesday, March 09, 2005 11:22 AM
To: [log in to unmask]
Subject: [TN] Microvias & plating

Does anyone call out the microvias to be plated flush? (This particular
board is immersion gold)
Our in house assembly is asking for this because they do not like the
dimples left on SMT pads from the microvias (especially on BGA pads).
Anyone who uses microvias, please let me know how you deal with your
microvias.
TIA
Denise Michaloski, C.I.D.
Windermere ITS
443-716-2510
[log in to unmask]


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