Have you contacted the customer and asked if there was a specific reason for
this requirement? Maybe if can address their concerns they maybe more
inclined to be less stringent. I designed a four layer board once that had
power and ground planes on the outer layers and signal traces in the inner
layers. It actually turned out to be very easy to route, this maybe an
option.

Regards,

Ted T. 

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of wheels
Sent: Wednesday, March 18, 2009 9:44 AM
To: [log in to unmask]
Subject: [DC] Traces and vias under components

Guys,

We have a customer which we are designing a mostly SMT board for that 
requires all traces and vias not to be under components. This would also 
include any planes being under the components. I guess in the past they had 
a board designed by some else that had a shorting problem with traced and 
vias under the components. They are insistence that this is the way it has
to 
be. Has anyone else had experience with this sort of demands? This is not
for 
space, military, high voltage, high vibration or a medical application. Can 
anyone think of anything we could tell they to change their mind?

Thank you, 
wheels

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