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IPC-7351 SMD & PTH Reference Calculators - PCB Libraries Forum - Page 1

PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/ipc7351-smd-pth-reference-calculators_topic785_page1.html

. I was referring to this Smax[RMS] formula in the 2005 IPC7351, please refer to attached image: In the "SMD Reference Calculator for Excel" the formula is this:  New Smax = Smax - (Stol -Stol[RMS])/2

PCB Libraries, Inc.

IPC-7351 SMD & PTH Reference Calculators - PCB Libraries Forum - Page 1

PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/topic785.html

. I was referring to this Smax[RMS] formula in the 2005 IPC7351, please refer to attached image: In the "SMD Reference Calculator for Excel" the formula is this:  New Smax = Smax - (Stol -Stol[RMS])/2

PCB Libraries, Inc.

IPC-7351 SMD & PTH Reference Calculators - PCB Libraries Forum - Page 2

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351-smd-pth-reference-calculators_topic785&OB=ASC_page2.html

: 23 Post Options Post Reply Quote stanleycayochok Report Post    Thanks(0)    Quote    Reply Posted: 15 Feb 2021 at 9:14pm There is a difference on the Smax[RMS

PCB Libraries, Inc.

IPC-7351 SMD & PTH Reference Calculators - PCB Libraries Forum - Page 1

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351-smd-pth-reference-calculators_topic785_post11246.html

. I was referring to this Smax[RMS] formula in the 2005 IPC7351, please refer to attached image: In the "SMD Reference Calculator for Excel" the formula is this:  New Smax = Smax - (Stol -Stol[RMS])/2

PCB Libraries, Inc.

IPC-7351 SMD & PTH Reference Calculators - PCB Libraries Forum - Page 1

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7351-smd-pth-reference-calculators_topic785_post11250.html

. I was referring to this Smax[RMS] formula in the 2005 IPC7351, please refer to attached image: In the "SMD Reference Calculator for Excel" the formula is this:  New Smax = Smax - (Stol -Stol[RMS])/2

PCB Libraries, Inc.

IPC-7351 SMD & PTH Reference Calculators - PCB Libraries Forum - Page 2

PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/ipc7351-smd-pth-reference-calculators_topic785_post9685.html

: 23 Post Options Post Reply Quote stanleycayochok Report Post    Thanks(0)    Quote    Reply Posted: 15 Feb 2021 at 9:14pm There is a difference on the Smax[RMS

PCB Libraries, Inc.

IPC-7351 SMD & PTH Reference Calculators - PCB Libraries Forum - Page 1

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic785.html

. I was referring to this Smax[RMS] formula in the 2005 IPC7351, please refer to attached image: In the "SMD Reference Calculator for Excel" the formula is this:  New Smax = Smax - (Stol -Stol[RMS])/2

PCB Libraries, Inc.

IPC-7351 SMD & PTH Reference Calculators - PCB Libraries Forum - Page 1

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic785&OB=DESC.html

. I was referring to this Smax[RMS] formula in the 2005 IPC7351, please refer to attached image: In the "SMD Reference Calculator for Excel" the formula is this:  New Smax = Smax - (Stol -Stol[RMS])/2

PCB Libraries, Inc.

Chip Component Land Pattern - PCB Libraries Forum

PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic551&OB=ASC.html

(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

PCB Libraries, Inc.

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