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Why do I need to design Break-away Rails (Break-away Tabs) ?

PCBA Store / 2017-05-13

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If the clearance between the board’s edge and copper features is less than 3.5mm (138mil), or your boards need to be panelized for some reason, Break-away rails (Break-away tabs) must be added at the two longer paralleled edges of the boards to ensure that the boards can be assembled by the SMT machine.