Roger,

We use them all the time. The trace widths you are describing are fine.
We have gone as small as 4 mils. If you use unbalanced traces, there is
a potential for tombstoning, but that has not happened to our assemblies
thus far.

Colleen

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Roger Stoops
Sent: Friday, December 22, 2006 9:40 AM
To: [log in to unmask]
Subject: [TN] 0402s and trace width

Hi Y'all,
 
Just started using 0402s en masse on a new product.  Potential problem
started to bother me, wanted to bounce this off all those brilliant
people out there.  Any one have some ideas on max trace/ copper width
connecting a pad for a 0402 package device?  Currently using 7 mil
traces for signals, 10 or 12 mils for power connections, thinking about
6.25 or 6 (for signal) to help with routing density issues...
 
Thanks,
 
Roger

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