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SMT Design: Package distance and stand-off height

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#57244

SMT Design: Package distance and stand-off height | 12 November, 2008

Hi all,

Assuming that i were to design a PCB and there are multiple components, what is the minimum spacing required to ensure that i won't have problems in my SMT process later on?

Also, is there a minimum component stand-off height spec as well? Can we control the component stand-off height if they were all surface mounts? Or i only care for leaded parts?

Thanks!

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#57277

SMT Design: Package distance and stand-off height | 13 November, 2008

For your pad layout and spacing between components, look here: http://portal.ipc.org/Purchase/ProductDetail.aspx?Product_code=77b562c1-b8f8-db11-8a6a-005056875b22

For your standoff height in SMT, we do not concern ourselves with standoff height. It is what it is.

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#57282

SMT Design: Package distance and stand-off height | 14 November, 2008

> For your pad layout and spacing between > components, look here: _a class=roll > href="http://portal.ipc.org/Purchase/ProductDetail > .aspx?Product_code=77b562c1-b8f8-db11-8a6a-0050568 > 75b22" > target="_blank"_http://portal.ipc.org/Purchase/Pro > ductDetail.aspx?Product_code=77b562c1-b8f8-db11-8a > 6a-005056875b22_/a_

> > For your standoff > height, we do not concern ourselves with standoff > height. It is what it is.

Hi,

thanks for the input. Well, i have the 7351 document, may i know which section you refer for the component to component spacing?

Is it the one at section 3.1.5.4 talking about courtyard determination? Is that the one that defines the component to component spacing?

Thanks in advance for your guidance.

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#57284

SMT Design: Package distance and stand-off height | 14 November, 2008

Yes, courtyard gives you the space requirement of a component. Sometimes, the working space of a rework tool takes precidence, though.

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