Hello,

I recommend looking at the IPC-A-610 for acceptability (Revision E is the latest) or the J-STD-001 (Rev E) for process development.

If the component is non-standard, the IPC-A-610E, Paragraph 1.4.1.7 Specialized Designs states:

"IPC-A-610, as an industry consensus document, cannot address all of the possible components and product design combinations. Where uncommon or specialized technologies are used, it may be necessary to develop unique acceptance criteria. However, where similar characteristics exist, this document may provide guidance for product acceptance criteria. Often, unique definition is necessary to consider the specialized characteristics while considering product performance criteria. The development should include customer involvement or consent. For Class 3 the criteria shall include agreed definition of product acceptance.

Whenever possible these criteria should be submitted to the IPC Technical Committee to be considered for inclusion in upcoming revisions of this standard."

What that means is that if the criteria isn't in the standard, compare your product to what is in the IPC-A-610 (acceptability) or J-STD-001 (process development). Find something that is close to what you have and adapt the standards to your use.

If you have a component that is completely different from anything currently in the standard, develop your acceptability criteria, using the IPC documents as a baseline, and then submit your criteria to IPC using the Standards Improvement Form ( either in the back of the standard or through this link: https://www.ipc.org/secure/forms/standards-improvement-form.aspx) for the next revision of the standards.

Mr. Kris Roberson
IPC- Association Connecting Electronics Industries(r)
Manager, Assembly Technology
[log in to unmask]<mailto:[log in to unmask]>
+1 847-597-2846

I would add to Kris' response a reference to the IPC-7351B, Generic Requirements for Surface Mount Design and Land Pattern Standard.  The IPC-7351 LP Calculator tool that comes with the standard addresses a number of "non-standard" SMT parts.

We have found over the past ten years that most component manufacturers have moved away from using standardized JEDEC component outlines and have come up with their own.  In the past it was easy to just list the package variations in the IPC land pattern standard since most followed JEDEC outlines.  Now the IPC-7351B LP Calculator tool comes in real handy because it can accommodate these unique component designs without much difficulty.

John Perry
Technical Project Manager
IPC - Association Connecting Electronics Industries(r)
+1 847-597-2818 (tel)
[log in to unmask]<mailto:[log in to unmask]>



-----Original Message-----

From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of SUBSCRIBE DesignerCouncil Anonymous

Sent: Monday, June 13, 2011 7:44 AM

To: DesignerCouncil

Subject: [DC] IPC-Standard for non-standard SMT leaded solder



Hello,



Can you please give me guidelines that which IPC standards are for SMT leaded, non-standard components' soldering and land pattern requirements?



I was advised to consider them as lap soldering type.



Regards


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