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general tolerance of a PCB, both of FR4 and metal core

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limct

Mechanical
Joined
Jan 27, 2003
Messages
134
Location
HK
Hi all,
Can someone shed some light on this for me.
Q: what's the general tolerance (pad size, distances, picthing..etc) of a Gerber file converetd PCB, both of FR4 and metal core type?
Many thanks!

Best regards,
ct
 
I'm not sure the question makes a lot of sense... the tolerance is whatever the manufacturer is able to achieve above the specs you set. I could make an FR4 board with tolerances on pad sizes of 100 mils using a permanent marker and an etch tank, but a board house might have a tolerance of 1 mil.


Dan - Owner
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You need to talk to several PCB manufacturers. Many have on their web sites a list of general specs for trace/space, minimum hole size, etc. But these guidelines can be exceeded for additional cost and lower yield.
 
Moreover, tolerances of finished parts are a function of the process control imposed by the manufacturer. I, doing parts in my garage, will have a different level of process control compared to a commercial shop.

If you're asking what the state of the art is, look at a high-end video card like an Nvidia Ge 7 series board:

It's got a 1GB memory with 512-bit effective memory I/O

TTFN
 
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