the IPC-7351 standard supersedes the IPC-782 .. yes,  some of the land
patterns (especially the passives) are very different from the
IPC-782..

in our case, we adviced our assembler that we are using 7351 and
suggested they check it using the 7351.. right now I think they are
transitioning to 7351

PCB Libraries also has a tool for calculating the correct land pattern
based on the IPC-7351

hope this helps...:)

On 7/29/05, Matthew Lamkin <[log in to unmask]> wrote:
> And does this necessarily make any board that has been designed to the IPC-SM-782A specs wrong/old technology/bad etc?
> 
> Most likely not, but I'm sure that Nick will be able to answer your question.
> 
> Matthew Lamkin.
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]]On Behalf Of Rich
> Schutz
> Sent: Friday, July 29, 2005 2:28 PM
> To: [log in to unmask]
> Subject: [DC] IPC-SM-782 VS IPC-7351
> 
> 
> We have been using IPC-SM-782 specs for years and have no problems. We
> request that are customers use the IPC-SM-782 specs when designing there
> PCBS. Some questions have come up in regards to the IPC-7351 specs, which
> some of our customers are  using for there designs. We typically review the
> chip components on all of the boards we manufacture, in doing so I came
> across an issue where the chip components specs have changed between the
> IPC-782 and IPC-7351. My questions are:
> 
> 1). Have the IPC-7351 specs replaced the IPC-SM-782 specs?
> 
> 2). Which spec should we be designing to?
> 
> 3). Why have the specs changed?
> 
> 4). Are the IPC-7351 Specs incorrect?
> 
> 
> Rich Schutz
> CAD Engineer
> Phone: 440-358-5217
> Fax: 440-358-5201
> Apsco, Inc
> 3700 Lane Road
> Perry, Ohio 44081
> 
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