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October 2000

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Subject:
From:
Paul Peltier <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 10 Oct 2000 09:54:39 -0400
Content-Type:
text/plain
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text/plain (113 lines)
ALTERA REFERS TO THESE AS "THERMALLY ENHANCED" BGA'S.
INTERESTINGLY ENOUGH THEY SAY NO SPECIAL PROCESSING IS REQUIRED.
I WILL BE READING ALL THE RESPONSES BECAUSE WE HAVEN'T HAD ALOT OF SUCESS
WITH THESE PARTICULAR DEVICES EITHER.

GOOD LUCK

----- Original Message -----
From: d. terstegge <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, October 10, 2000 10:25 AM
Subject: Re: [TN] Heavy BGA's, now it's fine-pitch !


Hi Jim,

Thanks for the suggestion. Any idea on how thick such a spacer should be,
and how to apply it ?  Like I mentioned, trial and error is no option for
this project.

Kind regards,

Daan Terstegge
SMT Centre
Signaal Communications
Unclassified mail
Personal Website: http://www.smtinfo.net

>>> "Marsico, James" <[log in to unmask]> 10/10 2:08 pm >>>
How about using a temporary spacer under each corner?

Jim M.


        -----Original Message-----
        From:   d. terstegge [SMTP:[log in to unmask]]
        Sent:   Tuesday, October 10, 2000 9:59 AM
        To:     [log in to unmask]
        Subject:        [TN] Heavy BGA's, now it's fine-pitch !

        Hi Technet,

        I need your advice on this one:
        Some time ago there was a discussion about soldering problems with
partnumberTMS320C6201GJC200 of Texas Instruments. It's a 1.27 mm pich BGA
with a heavy heat-slug on top. The weight of the heat-slug makes the
solderballs collapse a little too much, resulting in solder bridges.
        Now I've got to assemble some boards with similar parts, but with a
much smaller ballpitch of only 0.8 mm.
        No problem for the ordinary type BGA's, but with the heatsink I'm
starting to feel uncomfortable. For the record: it's TI's part
numberTMX320C6203GLS.
        I've got to build two boards, and all I've got is two components. No
trial and error possible......
        If anyone of you have experience or thoughts about this, please let
me know.

        Kind regards,

        Daan Terstegge
        SMT Centre
        Signaal Communications
        Unclassified mail
        Personal Website: http://www.smtinfo.net




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