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Subject:	Re: Recommended SMD to SMD clearances?
From:	Craig Cullum <[log in to unmask]>
Reply To:	TechNet E-Mail Forum <[log in to unmask]>, Craig Cullum <[log in to unmask]>
Date:	Tue, 31 Oct 2006 13:21:15 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (52 lines)

Further to Thad's question, does the IPC spec refer to the spacing
between SMT pads of adjacent components or does it refer to the spacing
between the component bodies themselves? Some comps extend beyond the
SMT pads while others do not.

Craig Cullum, Engineering Technologist, AMTELCO
e: [log in to unmask]
   [log in to unmask]
f: 608 838 8367
v: 608 838 4194, or 4197, x128

Please visit us at www.amtelco.com 

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Thad Schultz
> Sent: Tuesday, October 31, 2006 11:21 AM
> To: [log in to unmask]
> Subject: [TN] Recommended SMD to SMD clearances?
> 
> All,
> 
> What IPC spec discusses recommended SMD to SMD clearances?  
> We are trying to update our internal documents to coincide 
> with the latest industry standards.  What I am after is the 
> recommended SMD to SMD clearances when laying out a PCB.  
> What should discrete chip to discrete chip spacings be?  SOIC 
> to SOIC?  Discrete to SOIC?  PLCC to PLCC?  Basically all 
> combinations of one part type to another including the 
> different possible rotations.  I have an old diagram from 
> IPC-SM-782 but I think it is outdated and replaced by another 
> IPC spec.  Any help would be appreciated.
> 
> Thanks.
> 
> Thad Schultz
> EDA Librarian / Sys Admin
> Woodward Industrial Controls
> [log in to unmask]
> ph (970)498-3570
> fax (970)498-3077
> www.woodward.com

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