PCB Libraries Forum : Footprint Error Pad-Pad clearance fail https://www.PCBLibraries.com/forum/ Tue, 07 Apr 2026 13:47:59 +0000 Tue, 23 Jan 2018 19:53:48 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=2283 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Footprint Error Pad-Pad clearance fail : I tried to add some screenshot...]]> https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9405.html#9405 Author: wawaus
Subject: 2283
Posted: 23 Jan 2018 at 7:53pm

I tried to add some screenshot snips but they appear not to have gone through.
]]> Tue, 23 Jan 2018 19:53:48 +0000 https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9405.html#9405 <![CDATA[Footprint Error Pad-Pad clearance fail : I did not create it with a longer...]]> https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9404.html#9404 Author: wawaus
Subject: 2283
Posted: 23 Jan 2018 at 7:50pm

I did not create it with a longer pin 1, I created a symetrical footprint, but with a 0.2mm clearance requirement the corner pads are closer than the the clearance specified and there was no warning that the rule had been violated.



]]> Tue, 23 Jan 2018 19:50:32 +0000 https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9404.html#9404 <![CDATA[Footprint Error Pad-Pad clearance fail : I don&#039;t know how you created...]]> https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9403.html#9403 Author: Tom H
Subject: 2283
Posted: 23 Jan 2018 at 2:53pm

I don't know how you created a QFN with a longer Pin 1 in the Calculator, it does not have that feature. 

Send us the FPX file for this Calculator part and your Preference .dat file so we can take a look. 

Never seen this issue in the past 15 years. 

]]> Tue, 23 Jan 2018 14:53:54 +0000 https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9403.html#9403 <![CDATA[Footprint Error Pad-Pad clearance fail : Hi Tom,I accept your comment about...]]> https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9402.html#9402 Author: wawaus
Subject: 2283
Posted: 23 Jan 2018 at 2:48pm

Hi Tom,
I accept your comment about the Mfr recommended pattern, but that does not change the fact the calculated footprint Did Not maintain the clearance I specified between the end of one calculated pad and the side of another adjacent calculated pad.
Bill
]]> Tue, 23 Jan 2018 14:48:16 +0000 https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9402.html#9402 <![CDATA[Footprint Error Pad-Pad clearance fail : I cannot find this part on www...]]> https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9401.html#9401 Author: Tom H
Subject: 2283
Posted: 23 Jan 2018 at 7:33am

I cannot find this part on www.pcblibraries.com/POD ;

The Vishay DG2722 datasheet - 
https://www.vishay.com/docs/68379/dg2722.pdf ;

Indicates that the footprint requires a longer Pin 1 and therefore must be created in FP Designer using the mfr. recommended pattern. 

The Preferences > Rules > Minimum Pad to Pad is for Standard Calculated parts only and does not have anything to do with custom FP Designer footprints that use the mfr. recommended patterns. 

]]> Tue, 23 Jan 2018 07:33:43 +0000 https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9401.html#9401 <![CDATA[Footprint Error Pad-Pad clearance fail : Generating a footprint for a Vishay-Siliconix...]]> https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9400.html#9400 Author: wawaus
Subject: 2283
Posted: 22 Jan 2018 at 11:54pm

Generating a footprint for a Vishay-Siliconix DG2722 Library fails to maintain the specified Pad to Pad clearance with the clearance rule set at 0.2mm. Between pads 1-10, 2-3, 5-6, 7-8  it delivers a clearance of only 0.14. To achieve the clearance, dimension S1 should have increased to 1.0mm.
Is this behaviour expected?
Have I missed something?
Bill
]]> Mon, 22 Jan 2018 23:54:45 +0000 https://www.PCBLibraries.com/forum/footprint-error-padpad-clearance-fail_topic2283_post9400.html#9400