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Distance of bottom layer SMD pad to thru-hole pads

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treez

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Hello,
Please can you confirm that for a offline power supply board (50w) with surface mount components on the bottom, and thru-hole on the top,
the SMD pads must be at least 3mm away from the thru-hole pads.
I just wondered if Wave and reflow soldering techniques have changed so that they can be closer?
 

Ask your assembler.
 
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