On Thu, 17 Oct 2002 20:58:21 +0800, Adeline wrote:

>I have been hearing this Fan out.
>But what is fan out.
>What it for?

Suprisingly for this list someone else gave you an electrical definition of
fan out. 

Fan out related to PCBs is more likely to mean placing a track and via on
every surface mount pad of a component prior to routing. 

This gives routing access to all layers from the start. Doing this and
removing the ones you don't need may be more efficient/optimal (especially
for autorouters) than placing them during routing. 

For high density surface mount packages you may not have many options for
patterns of tracks and vias which will fit between the pads. 

Cheers, Terry.

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