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ACPM-7881-BLK Datasheet(PDF) 11 Page - AVAGO TECHNOLOGIES LIMITED |
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ACPM-7881-BLK Datasheet(HTML) 11 Page - AVAGO TECHNOLOGIES LIMITED |
11 / 12 page 11 PCB Design Guidelines TherecommendedACPM-7881PCBlandpatternisshown inFigure16.Thesubstrateiscoatedwithsoldermaskbe- tweentheI/Oandconductivepaddletoprotectthegold padsfromshortcircuitthatiscausedbysolderbleeding /bridging. Stencil Design Guidelines Aproperlydesignedsolderscreenorstencilisrequiredto ensureoptimumamountofsolderpasteisdepositedonto thePCBpads.Therecommendedstencillayoutisshownin Figure17.Thestencilhasasolderpastedepositionopening thatisapproximately80%ofthePCBpad.Reducingthe stencilopeningcanpotentiallygeneratemorevoids.On theotherhand,stencilopeningslargerthan100%willlead toexcessivesolderpastesmearorbridgingacrosstheI/O padsorconductivepaddletoadjacentI/Opads.Consider- ingthefactthatsolderpastethicknesswilldirectlyaffect thequalityofthesolderjoint,agoodchoiceistouselaser cutstencilcomposedof0.100mm(4mils)or0.127mm(5 mils)thickstainlesssteelwhichiscapableofproducing therequiredfinestenciloutline.ThecombinedPCBand stencillayoutisshowninFigure18. Figure 16. PCB land pattern (dimensions in mm) Figure 17. Stencil outline drawing (dimensions in mm) Figure 18. Combined PCB and stencil layouts (dimensions in mm) .1 0. 0. 0. 1. 0. 0. 0. .1 1. 0. Stencil Opening 0. |
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