Mark -

This will be a function of foil thickness and the specific fab shop
capabilities.  Some of the shops advise that they are offering .005/.005" in
half ounce copper as their standard, while others require a premium for
anything under .008/.008" due to reduced yields IN PRODUCTION.  Another
factor can be how extensive the use of fine line is on your design.

Check the planned fab house during the prototype/development phases, before
committing a final design to production.

Regards - Kelly


-----Original Message-----
From: Mark Mainland <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Wednesday, May 10, 2000 11:31 AM
Subject: [DC] Traces


>I was curious if someone knows how narrow of a trace can I
>go until it affects board costs? I have been using 8 mil as a rule.
>
>Thanks
>
>
>Mark Mainland
>PCB Designer
>Cherry Electrical Products
>11200 - 88th Ave.
>PO Box 581913
>Pleasant Prairie, WI 53158
>Ph. 262.942.6659
>Page. 888.819.0198
>Fx. 262-942-6334