Inge,
This is because board flexure or deformation is typically greatest at 
corners and along board edges. The same rule should be applied to chip 
capacitors as well.

Regards,

John Maxwell


>Dear collegues,
>
>I have heard of a thumb rule, never place them along and close to the
>edge. Hence, we place them (when suitable) in the center. I have
>forgotten why this rule. Was it because of vibration nodes, warpage
>during soldering, tempcycle issues or what? Is there a IPC standard or
>other reference?
>
>Inge
>
>  
>

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