--===============1887850978== Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by pch.mit.edu id m2QL9xDP016641 It should be migration, sorry. > Date: Wed, 26 Mar 2008 12:26:56 -0800> From: piclist9@gmail.com> To: pi= clist@mit.edu> Subject: Re: [EE] does anyone know the standard for PCB tr= ace width under metal migration?> > 8mil for class2 is a large width. Som= e PCB houses accept minimum with> of 3.5mil, I have always used 4mil widt= h with 4 mil isolation, but> that depends of circuit complexity and packa= ge pitch.> > On 3/26/08, Hong Yu wrote:> > We always u= se 8 mil minimum in our PCB, recently there is some> > contamination foun= d, does anyone know a resource of such a topic in the> > title?> >> > -->= > http://www.piclist.com PIC/SX FAQ & list archive> > View/change your m= embership options at> > http://mailman.mit.edu/mailman/listinfo/piclist> = >> -- > http://www.piclist.com PIC/SX FAQ & list archive> View/change you= r membership options at> http://mailman.mit.edu/mailman/listinfo/piclist _________________________________________________________________ =D3=C3=CA=D6=BB=FAMSN=C1=C4=CC=EC=D0=B4=D3=CA=BC=FE=BF=B4=BF=D5=BC=E4=A3=AC= =CE=DE=CF=DE=B9=B5=CD=A8=A3=AC=B7=D6=CF=ED=BE=AB=B2=CA=A3=A1 http://mobile.msn.com.cn/ --===============1887850978== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: 7bit -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --===============1887850978==--