The following suggestions are provided by member/supporter Rick Shook of Lucent Technologies:

"On item #1 - any nitrogen purge oven will work.

On item #2 - yes - "Derating" tables are available - one will be included
in the handling spec. i.e. J-STD-033 (This document is in the initial development phase as a joint effort of IPC and JEDEC.)

On item #3 - Try Accu-seal Corp.
                 11055 Flintcote Ave.
                  San Diego,  CA  92121
                 (800) 452-6040

On item #4 - I don't know of one, I gave a tutorial on moisture sensitivity
             at the 1995 IRPS.  Jack McCullen of Intel has material on
             this subject that he gives tutorials on at the ECTC.

Hope this helps,

Rick Shook
Lucent Technologies"
*****************************
>>> Charles Elliott <[log in to unmask]> 12/03/97 10:18AM >>>
Subject: ASSY:BGA Moisture Handling                       1997.12.0310:37 AM

Hi TechNetters,

I have some questions about handling of moisture sensitive BGA's (and other
components).

1. Where can I get a low RH (<5% RH) oven for baking BGA's at low temperature
(40'C) ?  (Tape and Reel does not appreciate the 125'C bake for 24 hours!)
What method are you using for baking (eqmt, temp., time) ?

2. Are there other methods used to control "repeated" exposures of components
other than a "follower" which travels with the Reel / Trays ?

3. Where can I get a proper sealer for MBBs (moisture barrier bags) ?  Is
there a method to verify that the seal is sufficient ?

4. Is there a commercial training package available for handling of moisture
sensitive components ?

Your help is greatly appreciated.

Charles Elliott
NPI Process Engineering
Newbridge Networks Corp.
[log in to unmask]


Jack Crawford, IPC Project Manger - Assembly
2215 Sanders Road, Northbrook IL  60062-6135
[log in to unmask]        http://www.ipc.org
847-509-9700 x 393
fax 847-509-9798

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