PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic995&OB=ASC.html
: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5380 Post Options Post Reply Quote Tom H Report Post Thanks(2) Quote Reply Posted: 29 Jun 2013 at 8:08am The PCB Library Expert default rule settings are from the IPC-7351 Land Pattern standard
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/dpak-with-tshaped-tab_topic2042_post8369.html
(D2PAK) packages. In a number of the variants, the thermal tab increases in width above the body of the part. My concern is that if I set E1 to the narrower dimension of the tab, it will solder okay, but the 3D model, courtyard, and outlines will be incorrect
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/topic2042&OB=ASC.html
(D2PAK) packages. In a number of the variants, the thermal tab increases in width above the body of the part. My concern is that if I set E1 to the narrower dimension of the tab, it will solder okay, but the 3D model, courtyard, and outlines will be incorrect
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/topic2042&OB=ASC.html
(D2PAK) packages. In a number of the variants, the thermal tab increases in width above the body of the part. My concern is that if I set E1 to the narrower dimension of the tab, it will solder okay, but the 3D model, courtyard, and outlines will be incorrect
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_convex-resistor-chip-array_topic2437.xml
; Why is Panasonic's land pattern for the EXB38V not the same as the EXB28V? Industry experts in many seminars I've attended have said that you shouldn't trust the data sheets. Mistakes are made.
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/RSS_asymmetric-tolerances-cause-bad-footprint-name_topic925.xml
name.Ultimately there could be any number of reasons that we might change the name of the land pattern and it should match when it is output to
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/nominal-epad-vs-max-epad_topic2530.html
: Most component manufacturer's recommended land pattern use the Nominal dimensions for the Thermal Pad size. This is probably the most important reason
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/nominal-epad-vs-max-epad_topic2530_post10399.html
: Most component manufacturer's recommended land pattern use the Nominal dimensions for the Thermal Pad size. This is probably the most important reason
PCB Libraries, Inc. | https://www.pcblibraries.com/forum/nominal-epad-vs-max-epad_topic2530_post10400.html
. The last part on the PCB is the land pattern they recommend. Not every mfr. does this, but how do you know which one did. Since IPC never created any test boards to validate the 7351 guideline for solder joint goals there is no conclusive evidence that the solder joint goals in the guideline are optimized for the best assembly attachment
PCB Libraries, Inc. | https://www.pcblibraries.com/Forum/nominal-epad-vs-max-epad_topic2530_post10400.html
. The last part on the PCB is the land pattern they recommend. Not every mfr. does this, but how do you know which one did. Since IPC never created any test boards to validate the 7351 guideline for solder joint goals there is no conclusive evidence that the solder joint goals in the guideline are optimized for the best assembly attachment
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