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Chip Component Land Pattern |
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Nick B 
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Joined: 02 Jan 2012 Status: Offline Points: 1974 |
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 Topic: Chip Component Land PatternPosted: 17 Sep 2012 at 2:31am |
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For those who want to customize library rules to meet manufacturer’s requirements and want to see how it works to create customized Footprint Expert DAT files (personal rules). IPC-7351C Reference Calculator (forum login is required to download)
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bakhmat
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Joined: 13 Sep 2012 Status: Offline Points: 2 |
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Posted: 13 Sep 2012 at 7:38am |
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Hi all,
How can I calculate Gmin for chip component (IPC-7351B)? I can't get the PCB Footprint Expert result.  Gmin=Smax-2*JH-SQRT(Cs^2+P^2+F^2), where Smax=Smin+Stol(RMS); Smin=Lmin-2*Tmax; Cs=Stol(RMS); Stol(RMS)=SQRT[(Lmax-Lmin)^2+(Tmax-Tmin)^2] JH=0 (Nominal Density for 0603 chip component) P - placement tol.; F - fabrication tol. Is that right? Thanks in advance
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