Chip Component Land Pattern
Printed From: PCB Libraries Forum
Category: Libraries
Forum Name: Footprints / Land Patterns
Forum Description: [General or a CAD specific issues / discussions]
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=551
Printed Date: 22 Nov 2024 at 2:09am
Topic: Chip Component Land Pattern
Posted By: bakhmat
Subject: Chip Component Land Pattern
Date 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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Replies:
Posted By: Nick B
Date Posted: 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). http://www.pcblibraries.com/downloads/FPX!PCBLs_IPC-7351C_Reference_Calculator.asp" rel="nofollow - IPC-7351C Reference Calculator (forum login is required to download)
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