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VTiederle
 Post subject: Missing chip or flag
PostPosted: 06 Aug 2014, 13:16 
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Joined: 24 Jul 2013, 12:32
Posts: 39
Recently I made a simulation for a multi-chip module where some BGA, QFN and a lot of capacitors and resitors are mounted. This module was attached as LGA to a PCB.
I defined the package as BGA and set the chip thickness to 0 - would this lead to valid results?

For QFN without flag - is it possible to set the thickness of the flag to 0?
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Nathan Blattau
 Post subject: Re: Missing chip or flag
PostPosted: 08 Aug 2014, 17:00 
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Joined: 21 Mar 2013, 16:40
Posts: 121
Location: Beltsville, Maryland
Hi Viktor,

A QFN device without a center solder pad needs to be treated as a SON device (small outline no-leads). The lead geometry is then set to STUB.

Setting the flag thickness to zero will likely generate an error or unrealistically short life.

Regards,
Nathan

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