Hi Juan,
Unfortunately the IPC-2616 (Sectional requirements for Assembly Documentation) doesn't appear to be released as of yet, that would have been my first choice. IPC-D-325 " Documentation Requirements for Printed Boards, Assemblies and Support Drawings " would be next and the final would be the IPC-2221 "Generic Standard on Printed Board design". Others may be able to point to a good reference.
But I'll give you a few guidelines that I've used over the years.
1. All ref-des for every component used on the assy shall be on the assy drawing(we don't permit exceptions here). Silkscreen has a bit flexibility, but the assy drawing doesn't.
2. Place the ref-des either inside the assy outline of the component or adjacent to it. Some parts may be too small to have a readable ref-des, so adjacent and sized to be readable would be best. If placed away from the part, you'll need a leader.
3. If you need to place ref-des outside the board outline, such as for a very small boards, you'd need leaders pointing to the parts.
4. Make it very clear which parts go to which ref-des, reduce ambiguity as much as you can. This will limit the phone calls and questions.
Hope this helps and if you have any questions, please feel free to ask.
-Jeffrey
Jeffrey A. Jenkins CID+,CIT
Senior PCB Staff Designer || L-3 Linkabit || Ph: 858-552-9832 || [log in to unmask]
-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Juan Vega
Sent: Tuesday, April 01, 2014 9:38 AM
To: [log in to unmask]
Subject: [DC] Assembly standard + best practices
Hello,
Can someone help me pointing out which standard should I consult in order to do a Printed circuit board assembly drawing?
I am trying to find, which is the best practice for location of reference designators (inside the part drawing, outside).
Best regards!!
Juan Vega | Product Enngineer | Branson Ultrasonics Emerson Industrial Automation | Lote #4 Carretera Nacional KM 8.5 Modulo Industrial America | Nuevo Laredo| Tamaulipas | 88277 | Mexico T + 011 52 867 711 0821 | F + 011 52 867 711 0811 [log in to unmask]<mailto:[log in to unmask]>
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