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October 2007

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Subject:
From:
Yuan-chia Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Yuan-chia Joyce Koo <[log in to unmask]>
Date:
Mon, 1 Oct 2007 14:21:10 -0400
Content-Type:
text/plain
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text/plain (107 lines)
It still a bad thing... it is good if the only one got caught...and  
less than 3.15 microinch...jk
On Oct 1, 2007, at 1:58 PM, Tempea, Ioan wrote:

> Jack,
>
> looks like you're OK. As per IPC-A-600G, 3.3.12, you are good even  
> for class 3, that accepts wicking < 80microns = 3.15 microinch.
>
> You lucky you!
>
> Ioan
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Guy Ramsey
> Sent: Monday, October 01, 2007 1:31 PM
> To: [log in to unmask]
> Subject: Re: [TN] Is This a BAD Thing?
>
>
> It can be. It is called wicking. The acceptance criteria are in IPC- 
> A-600F
> 3.3.11 Wicking ............................................ 86
> 3.3.11.1 Wicking, Clearance Holes ................ 87
>
> I don't have a copy here. But, those look pretty long. I think the
> specification goes to electrical clearance.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
> Sent: Monday, October 01, 2007 12:56 PM
> To: [log in to unmask]
> Subject: [TN] Is This a BAD Thing?
>
> I'm not accustomed to looking at reliability issues, (my designs  
> are usually
> so perfect... (grin)) so every time I see an X-Ray or a cross- 
> section I get
> nervous wondering what I'm actually seeing.
>
> Can anyone explain what the following picture means?
>
> http://www.frontdoor.biz/PCBportal/208what.jpg
>
> onward thru the fog,
> Jack
>
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