AMC7834: Stencil Design

Allan Fan

Part Number: AMC7834

Hi Expert,

May I clarify what's the purpose to design the stencil separating 25 windows by the vias? Or can customer just have a complete plan with vias?

Regards,

Allan

over 2 years ago

+1 Erin Bowrie over 2 years ago

TI__Genius 10990 points

Hi Allan,

The windowed stencil is more likely to have a uniform solder flow compared to a solid landing with vias. TI recommends using the windowed plan for this reason.

Thanks,
Erin

0 Benjamin Bawkon over 2 years ago

Expert 1100 points

Allan,

Large apertures in the stencil also suffer from scoop-out, where the blade of the squeegee dips down into the void and 'scoops' some of the solder paste out.

The vast majority of stencil fabrication companies will automatically window-pane (that's what this technique is referred to) any large apertures even if you don't design them that way.

Ben

0 Allan Fan over 2 years ago in reply to Benjamin Bawkon

TI__Expert 7100 points

Ben,

Thanks for the further explanations.

Regards,

Allan

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AMC7834: Stencil Design