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| From: | |
| Reply To: | (Leadfree Electronics Assembly Forum) |
| Date: | Mon, 28 Feb 2005 15:06:40 -0500 |
| Content-Type: | text/plain |
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Does this apply for SMT, PTH or both?
P
Camille,
Does this apply for SMT, PTH or both?
Phil
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Camille Good
Sent: Monday, February 28, 2005 2:56 PM
To: [log in to unmask]
Subject: Re: [LF] Maximum PWB Size
Colin,
A seminar I went to last year said that for 0.063-inch
thick PCBs, the PCB will need a metal frame for
support if it is greater than 9 inches in any
dimension.
-Camille
--- "James, Chris" <[log in to unmask]> wrote:
> We still expect equipment capability to be the
> limiting factor on board
> size.
>
> You may need to look a board supports to stop sag.
>
> There are many projects starting or underway looking
> into process
> concerns, the NPL being one.
>
> Regards,
> Chris
>
> -----Original Message-----
> From: Leadfree [mailto:[log in to unmask]] On Behalf
> Of Colin Weber
> Sent: 28 February 2005 00:08
> To: [log in to unmask]
> Subject: [LF] Maximum PWB Size
>
> Hi Folks,
>
> Can anyone suggest what might be a good guide for
> maximum multilayer
> (4-8
> layers) PWB size
> for Lead Free Processes. ie. Has anyone experienced
> a PCB size
> limitation
> where lead free
> processing raises concern for reliability of the
> boards service life?
>
> I am of the understanding that reliability may be
> poorer for larger
> printed
> circuit boards
> going through the higher temperatures during
> manufacture. Issues like
> warping and plated
> through-holes stress being of particular concern to
> me.
>
>
>
> Regards,
>
> Colin Weber
>
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