What are we looking in the ball photo? Are these voids caused by a test
socket? What testing was the device subjected causing these voids? And
lastly is the damage detected before attachment to the board?

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of
[log in to unmask]
Sent: Monday, September 09, 2002 10:27 AM
To: [log in to unmask]
Subject: Re: [TN] 1mm bga voiding


Victor and other Technetters,

Hopefully this link shows the 1mm BGA picture (x-section)

http://www.ofoto.com/PhotoView.jsp?UV=922011120789_31499403105&US=0&collid=2
9888403105&photoid=19888403105


Al




Victor Hernandez <[log in to unmask]>@IPC.ORG> on 09/09/2002
12:23:59 PM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
      to [log in to unmask]

Sent by:  TechNet <[log in to unmask]>


To:   [log in to unmask]
cc:

Subject:  Re: [TN] 1mm bga voiding


Al,

   The IPC-A-610C sec. 12.2.12 Area Array/Ball Grid Array states that "
Acceptable - Class 1,2,3 Less than 10% voiding in the ball to board
interface.   Process Indicator - Class 2,3  10-25% voiding in the ball to
board interface.   What is the SIZE of the ball you are using.

   Did we have to SIGN UP to the Web Page to view your photo.   Perhaps a
fellow TechNetter can offer their site for viewing.

victor,

-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Monday, September 09, 2002 9:13 AM
To: [log in to unmask]
Subject: [TN] 1mm bga voiding


Technetters-

We are getting 1mm BGA devices with these mechanical defects (see attached*
for link to picture) from testing processes at the vendor.

These devices have excessive voiding when reflowed on to a board with other
BGAs that do not have a voiding problem.  The vendor insists it is our
process that causes the voiding.

Question-  would you expect this mechanical damage to lead to voiding in
the reflowed joint?


*
http://www.ofoto.com/ShareLandingSignin.jsp?UV=922011120789_31499403105&US=0

&Upost_signin=OrderPhotos.jsp%3FshowSlide%3Dtrue&Un=774560513&Um=54718403105

.84079403105



Al

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