PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic1463&OB=ASC.html
we’re currently working on. The IPC-7251 through-hole pad stack was inherently flawed due to the 3-Tier annular ring concept that the same Annular Ring Value could be used for any hole size
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/ipc7251-3tier-pth-pad-stack-obsolete_topic1463.html
we’re currently working on. The IPC-7251 through-hole pad stack was inherently flawed due to the 3-Tier annular ring concept that the same Annular Ring Value could be used for any hole size
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_son-qfn-calculations_topic889.xml
;land dimensions for QFN/SON is fundamentally flawed. Why? Because it assumes maximum tolerance dimensions for the center
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/library-expert-pth-calculator_topic2114_post8749.html
: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5193 Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 14 Mar 2017 at 12:03pm IPC never released the Through-hole Standard because it was heavily flawed
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/library-expert-pth-calculator_topic2114_post8749.html
: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5193 Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 14 Mar 2017 at 12:03pm IPC never released the Through-hole Standard because it was heavily flawed
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/library-expert-pth-calculator_topic2114_post8746.html
: 5170 Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 14 Mar 2017 at 12:03pm IPC never released the Through-hole Standard because it was heavily flawed
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/topic2114&OB=DESC.html
: 5188 Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 14 Mar 2017 at 12:03pm IPC never released the Through-hole Standard because it was heavily flawed
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/library-expert-pth-calculator_topic2114_post8747.html
: 5375 Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 14 Mar 2017 at 12:03pm IPC never released the Through-hole Standard because it was heavily flawed
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2114&OB=ASC.html
: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5376 Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 14 Mar 2017 at 12:03pm IPC never released the Through-hole Standard because it was heavily flawed
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic1458&OB=DESC.html
: Removed IPC-7251 Levels A, B & C and replaced by IPC-7351C Proportional Pad Stacks. IPC-7251 was canceled by IPC. The 3-Tier approach for through-hole was heavily flawed as it used the same annular ring regardless of the hole size New Reference Calculator - http
