1 Reply Latest reply on Jan 18, 2011 9:44 AM by wolferm

    OT: IPC Slash sheet reference?

    pcorbin

      I am going back and forth on this issue (again):

       

      Should the fab drawing reference IPC slash sheets for material call-out;

      or should the material reference just be generic requirements?

       

      I.E.: "NEMA GRADE FR4 IAW IPC-4101-nn; UL 94V0".

       

      OR:

       

      "NEMA GRADE FR4, UL 94V0, Tg 130C MIN; Td 320C, T288 >/= 4 MINUTES, Z AXIS EXPANSION 3.5% MAX".

       

      I have conflicting opinoins on using IPC slash numbers versus calling out the requirements in a more generic fashion.

       

      Any input would be appreciated. I am trying to use the least amount of information

      that yields the maximum production efficiency with the lowest prices. Haha...isn't everyone?

      Thanks, Patrick

        • 1. Re: OT: IPC Slash sheet reference?
          wolferm

          Patrick,

          I would agree to keep it as generic as possible but if your min requirements for design

          are the 130Tg etc I would specify it that way. Ref the overall IPC material spec

          is fine but it there are key min requirements like the Tgm & Td I would

          tend towards wanting to define that in words on the dwg.

          Bob