November 23, 2006
Dave, happy turkey day. My response did not mean I agree that conformal coating should in fact be applied under a component. What I indicated was that if the drawing specifically mandated that the assembly be conformal coated, then the expectation is that coating must be applied under, over, and everywhere else on the assembly unless the assembly drawing specifically requires masking free of certain areas from conformal coating.. If conformal coating should not be applied under a part, then the drawing needs to say so.
----- Original Message -----
From: David D. Hillman<mailto:[log in to unmask]>
To: [log in to unmask]<mailto:[log in to unmask]>
Sent: Monday, November 20, 2006 6:27 PM
Subject: Re: [TN] BGA and conformal coating
Hi Bogert! Sorry but I respectfully disagree. If the contract requires the
assembly to be conformal coating and provides no other process guidance
then I would process the assembly in accordance with best industry
practice/accepted material process practice for the particular conformal
coating material specified. As other TechNettees have documented,
intentionally forcing AR or UR conformal coating under a component is not
standard conformal coating practice as the such an action results in
degraded component/product integrity due to CTE mismatch for many use
environments. However, if I was using a paralyene conformal coating,
standard material process practice is quite the opposite - paralyene
conformal coating is design to coat all pwa surfaces. The application
process for each conformal coating material dictates how/where it should be
applied unless there are specific instruction that deviate from standard
practice (such as a specific exclusion area for RF, etc.).
Dave
- Bogert
<[log in to unmask]<mailto:[log in to unmask]>>
Sent by: TechNet To
<[log in to unmask]<mailto:[log in to unmask]>> [log in to unmask]<mailto:[log in to unmask]>
cc
11/20/2006 03:52 Subject
PM Re: [TN] BGA and conformal coating
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]<mailto:[log in to unmask]>>
; Please respond
to
- Bogert
<[log in to unmask]<mailto:[log in to unmask]>>
If the contract assembly drawing requires the assembly to be conformal
coated, unless it also allows the area under the BGA to be free of coating,
then you are in violation of the contract drawing regardless of what 610
says or does not say.
----- Original Message -----
From: David D. Hillman<mailto:[log in to unmask]<mailto:[log in to unmask]>>
To: [log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]>>
Sent: Monday, November 20, 2006 2:20 PM
Subject: Re: [TN] BGA and conformal coating
Hi Joe - Your statement......." type AR or type UR does not coat the BGA
solder balls/solder connections located under the BGA so you are
violating
the acceptability requirements in IPC-A-610" has me some confused. What
IPC-A-610 requirement is violated?
Dave Hillman
Rockwell Collins
[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]>>
"Macko, Joe @
IEC"
<joe.macko@L-3COM<mailto:joe.macko@L-3COM<mailto:joe.macko@L-3COM<mailto:joe.macko@L-3COM>>
To
.COM> [log in to unmask]<mailto:[log in to unmask]><
mailto:[log in to unmask]<mailto:[log in to unmask]>>
Sent by: TechNet
cc
<[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]>>>
Subject
Re: [TN] BGA and conformal coating
11/20/2006 12:47
PM
Please respond to
TechNet E-Mail
Forum
<[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]>>>
; Please respond
to
"Macko, Joe @
IEC"
<joe.macko@L-3COM<mailto:joe.macko@L-3COM<mailto:joe.macko@L-3COM<mailto:joe.macko@L-3COM>>
.COM>
Vered,
I would start with IPC-A-610 and J-STD-001 documents. One item that is
over
looked is that spraying a board with for example type AR or type UR does
not
coat the BGA solder balls/solder connections located under the BGA so you
are violating the acceptability requirements in IPC-A-610!
Good luck,
- Joe
-----Original Message-----
From: Vered BS [mailto:[log in to unmask]]
Sent: Monday, November 20, 2006 8:40 AM
To: [log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]<mailto:[log in to unmask]>>
Subject: [TN] BGA and conformal coating
looking for reviews/articles or case studies regarding conformal coating
on
BGA
for military/aerospace environment
Appreciate any comment or sharing your experiance
Thanks
Vered
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