The fabricators hang out on the TechNet maillist, you could get a definitive answer there. Join at www.ipc.org They tolerate designer questions pretty well.
Most we've done is 20/.093" and 8/.050". Gary Crowell Micron Technology > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Jon Elson > Sent: Thursday, January 19, 2006 1:55 PM > To: Protel EDA Discussion List > Subject: Re: [PEDA] 16 layer question > > > > Duane Foster wrote: > > >I'm designing a 16 layer board and would like it to be > 'vanilla' (easy to make - low cost). Is .062" board > thickness pretty standard fare for 16 layer? > > > > > Yow! I've never done a 16-layer myself, but have seen a few in other > gear. I don't believe I have ever seen 16 layers in a .062" > thickness. > I think I have seen a number of them run between .1 and .125" thick. > I'm guessing that packing that many layers into a very thin total > thickness doesn't leave enough room for the core that supports the > entire board in the laminating press. "Squirm" is a major problem > above 4 layers, as the density variations of the copper layers try to > even themselves out by squeezing out of the high-density areas. The > only thing to resist those forces are the core(s), which can be one in > the center or one just under each outside copper layer. The > power/ground > planes also help support the laminate just to the side of them. > > If you need tight layer registration, I think a fabricator is > going to have > a problem combining that with a thin board. Technique is always > improving, of course. > > Jon > > > > ____________________________________________________________ > You are subscribed to the PEDA discussion forum > > To Post messages: > mailto:[email protected] > > Unsubscribe and Other Options: > http://techservinc.com/mailman/listinfo/peda_techservinc.com > > Browse or Search Old Archives (2001-2004): > http://www.mail-archive.com/[email protected] > > Browse or Search Current Archives (2004-Current): > http://www.mail-archive.com/[email protected] > > ____________________________________________________________ You are subscribed to the PEDA discussion forum To Post messages: mailto:[email protected] Unsubscribe and Other Options: http://techservinc.com/mailman/listinfo/peda_techservinc.com Browse or Search Old Archives (2001-2004): http://www.mail-archive.com/[email protected] Browse or Search Current Archives (2004-Current): http://www.mail-archive.com/[email protected]
