> For me, the vast majority of components are hard metric > specified! I do > a lot of fine pitch SMD.
True! Most *modern* packages are metric Examples: MQFP-144 (ST10F168) 0.65mm pitch FP-64A (Hitachi H8/3644, NEC 78F0034) 0.8mm pitch QFP14-80 (Epson SED1375) 0.5mm pitch TSOP-48 (AMD 29F400 Flash) 0.5mm pitch Most BGAs have metric pitch The finer the pitch of a package is, the more likely its specification is metric. The problem is that the rounding errors are also getting more critical with finer pitch :-( > As has been noted before on this forum, if Protel had a hard metric > base unit in the database it could still provide imperial > entry for those > that live in backward countries :-) but with the significant advantage > that there would be no conversion error when converting > between display > units. That is because 1 inch is *exactly* 25,4 mm whereas 1 mm is *roundabout* 0,0393700787401574803149606299212598 inches ;-) > Protel's use of english base units is a fundamental flaw that > could easily > have been rectified in the process of writing a major new > release (e.g. in > Protel 98 or in DXP), and it would have been easy to specify > that version 5 > databases are hard metric, while versions below this are > english base units. > The fact that it wasn't was, for me, the biggest > disappointment with DXP. Well spoken. Cheers, Ralf ************************************************************************ * Tracking #: F203522120F87A47ADF81C0690330D86FFC5D012 * ************************************************************************ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
