PCB Libraries Forum : Rounded Rectangle Radius is Different in Altium https://www.PCBLibraries.com/forum/ Fri, 26 Jun 2026 13:25:35 +0000 Sat, 28 Feb 2015 08:29:03 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=1581 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Rounded Rectangle Radius is Different in Altium : The difference in the SOT223 default...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6452.html#6452 Author: Jeff.M
Subject: 1581
Posted: 28 Feb 2015 at 8:29am

The difference in the SOT223 default pad and the wide pad is because the percent is applied to the smallest pad dimension.  Obviously the smaller dimensions are different therefore the corner radius is different.
The SOT143 probably Has the same issue.
I don’t know if that’s good or bad but that’s why.  Its actually working as designed.
So now the question is should all pads in these two and similar applications have the same corner radius or is a calculated radius acceptable for each individual pad?

]]> Sat, 28 Feb 2015 08:29:03 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6452.html#6452 <![CDATA[Rounded Rectangle Radius is Different in Altium : The SOT223 and SOT143 large...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6451.html#6451 Author: Tom H
Subject: 1581
Posted: 28 Feb 2015 at 8:23am

The SOT223 and SOT143 large pad has different rules to avoid terminal lead hangover.
 
But we're going to change that to a normal pad to test the rounded rectangle results.
 
This change will be in the V2015.09 release on Monday 3/2/15.
 
]]> Sat, 28 Feb 2015 08:23:30 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6451.html#6451 <![CDATA[Rounded Rectangle Radius is Different in Altium : Hi Tom,what i am asking for is,...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6448.html#6448 Author: MSM_KOPF
Subject: 1581
Posted: 27 Feb 2015 at 6:47am

Hi Tom,
what i am asking for is, how to setup this tool that at the end after import into altium all rounded rectangle pads report "corner Radius (%) = 10%" regardless of their pad size. and this for all footprints.

by changing user setup rules to
Corner Radius Size 5
Corner Radius Size Roundoff 0.001
for the SOT223 default reference pad 1-3 now have 10% but pad 4 is now set to 5%


]]> Fri, 27 Feb 2015 06:47:49 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6448.html#6448 <![CDATA[Rounded Rectangle Radius is Different in Altium : 50% in each pad corner= a Full...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6446.html#6446 Author: Tom H
Subject: 1581
Posted: 27 Feb 2015 at 6:40am

50% in each pad corner = a Full radius.
 
However, 50% total overall = 25% in each corner.
 
Altium is doubling Library Expert numbers.
 
There is a big difference of 25% in each corner or 25% overall = 12.5% in each corner.
 
Do like I said and make Library Expert 5% corner radius with a 0.001 round-off and you'll get what you are looking for in Altium.
 
]]> Fri, 27 Feb 2015 06:40:03 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6446.html#6446 <![CDATA[Rounded Rectangle Radius is Different in Altium : The Corner Radius in Altium is...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6444.html#6444 Author: robmeyer
Subject: 1581
Posted: 27 Feb 2015 at 6:33am

The Corner Radius in Altium is 50% from the smallest side.

So when Pad Width is 0.27 mm and you have a radius if 22% you should get a radius of 0.0297mm.

Quote from Altium Tech Doc:
Corner Radius - Represents the corner radius of a pad. Pad radius is represented as a percentage of half of the shortest side of the pad. As such, a value of 0% corresponds to a rectangular pad, and 100% to a circular pad. This field only applies when the Shape field is set to Rounded Rectangle. 
To change the corner radius, click in the field and enter a new percentage. The X (horizontal) and Y (verical) sizes can be set independently to define asymmetric pad shapes.


So for Altium 10% should be 20%.
]]> Fri, 27 Feb 2015 06:33:04 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6444.html#6444 <![CDATA[Rounded Rectangle Radius is Different in Altium : OK, I can see what&#039;s happening...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6442.html#6442 Author: Tom H
Subject: 1581
Posted: 27 Feb 2015 at 6:11am

OK, I can see what's happening here. The Library Expert calculates corner radius by the pad width X 10% for each corner.
 
I import the QFN into Altium Designer and query the pad stack and the Rounded Corner radius indicates 22% over all.
 
It seems that Altium percentage is 10% overall which means that it's 5% in each corner.
 
If you change the Library Expert to be 5% corner radius with a 0.001 mm round-off you will get the correct result you're looking for in Altium.
 
]]> Fri, 27 Feb 2015 06:11:32 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6442.html#6442 <![CDATA[Rounded Rectangle Radius is Different in Altium : Let&#039;s handle this one part...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6441.html#6441 Author: Tom H
Subject: 1581
Posted: 27 Feb 2015 at 5:57am

Let's handle this one part at a time. First the QFN.
Here are the User Preference > Rules > Corner Radius -
 
 
Here is the QFN50P500X400X80-29T255X355 pad stacks.
 
As you can see, the Pad Width = 0.27 mm and 10% = 0.027 with a round-off of 0.01 = 0.03
 
Thus the pad stack name = r86_27r3
 
 
Why do you continue to mention the Thermal Pad? It's corner radius is determined in the component dimensions.
 
 
]]> Fri, 27 Feb 2015 05:57:00 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6441.html#6441 <![CDATA[Rounded Rectangle Radius is Different in Altium : V2015-08 setup as mentionchoose...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6438.html#6438 Author: MSM_KOPF
Subject: 1581
Posted: 27 Feb 2015 at 12:09am

V2015-08 setup as mention

choose Surface mount -> SOT223 -> Reference
this will create SOT223-SOT230P700X180-4L40N
Export to Altium via Script
Import and check the 4 pads
Pad 1-3 1.97mm x 0.89mm rounded rectangle 20%
Pad 4 1.97mm x 3.19mm rounded rectangle 10%


surface mount -> qfn with tab - reference
creates QFN50P500X400X80-29T255X355N
Pad 1-28 0.86mm x 0.27mm rounded rectangle 22%
Thermal Pad 2.55mm x 4.01mm with an edge ~0.35mm and 3x radius 0.05


]]> Fri, 27 Feb 2015 00:09:05 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6438.html#6438 <![CDATA[Rounded Rectangle Radius is Different in Altium : I&#039;m using the current V2015.09...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6429.html#6429 Author: Tom H
Subject: 1581
Posted: 26 Feb 2015 at 10:10am

I'm using the current V2015.09 pre-release and I am not seeing the problem that you are referring to.
 
I changed my user preferences to 10% for Rounded Rectangle pad shape and it's working like normal for every component family.
 
Can you be more specific with numbers? Tell us your pad width and the pad stack name.
]]> Thu, 26 Feb 2015 10:10:01 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6429.html#6429 <![CDATA[Rounded Rectangle Radius is Different in Altium : I don&#039;t mean the thermal...]]> https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6428.html#6428 Author: MSM_KOPF
Subject: 1581
Posted: 26 Feb 2015 at 9:18am

I don't mean the thermal tab inside the QFN.
instead the pads around the thermal pad regarding QFN with tab

Regarding SOT223, this footprint has 4 pads again no thermal tab, and these 4 pads are rounded rectangles were only the big pad 4 follows the setup for limitation of the corner radius size 10%
So why does pad 4 follow the setup limit and the 3 other pads not ?
I assume this is a bug.

]]> Thu, 26 Feb 2015 09:18:34 +0000 https://www.PCBLibraries.com/forum/rounded-rectangle-radius-is-different-in-altium_topic1581_post6428.html#6428