PCB Libraries Forum : Step Model Pin One Dot Missing https://www.PCBLibraries.com/forum/ Sun, 05 Apr 2026 16:56:14 +0000 Mon, 17 Jun 2024 08:46:30 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3291 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Step Model Pin One Dot Missing : The Chamfered Body along the Pin...]]> https://www.PCBLibraries.com/forum/step-model-pin-one-dot-missing_topic3291_post13560.html#13560 Author: Tom H
Subject: 3291
Posted: 17 Jun 2024 at 8:46am

The Chamfered Body along the Pin 1 side is for most SOIC's. 

The Chamfered Body differentiates between Inch and Metric packages. 

Only SOIC's with Metric pin pitch have polarity dots on 3D STEP models. 

The plastic body on the TI SOIC in datasheet you listed has both a Chamfer and a Dot. That's a double polarity marker. 

]]> Mon, 17 Jun 2024 08:46:30 +0000 https://www.PCBLibraries.com/forum/step-model-pin-one-dot-missing_topic3291_post13560.html#13560 <![CDATA[Step Model Pin One Dot Missing : Is there a option to add a pin1...]]> https://www.PCBLibraries.com/forum/step-model-pin-one-dot-missing_topic3291_post13559.html#13559 Author: cc_ds
Subject: 3291
Posted: 17 Jun 2024 at 2:33am

Is there a option to add a pin1 dot into the 3d model for SOIC?

I have this component here and it shows a pin1 dot.
https://www.ti.com/product/AMC1311/part-details/AMC1311DWVR

]]> Mon, 17 Jun 2024 02:33:42 +0000 https://www.PCBLibraries.com/forum/step-model-pin-one-dot-missing_topic3291_post13559.html#13559 <![CDATA[Step Model Pin One Dot Missing : This is an Inch Pitch SOIC and...]]> https://www.PCBLibraries.com/forum/step-model-pin-one-dot-missing_topic3291_post13145.html#13145 Author: Tom H
Subject: 3291
Posted: 10 Jul 2023 at 12:08pm

This is an Inch Pitch SOIC and they don't have Polarity Dots. 

They have a chamfered body along the side where Pin 1 is. 


 
]]> Mon, 10 Jul 2023 12:08:10 +0000 https://www.PCBLibraries.com/forum/step-model-pin-one-dot-missing_topic3291_post13145.html#13145 <![CDATA[Step Model Pin One Dot Missing : When creating a STEP model, I...]]> https://www.PCBLibraries.com/forum/step-model-pin-one-dot-missing_topic3291_post13144.html#13144 Author: rrix
Subject: 3291
Posted: 10 Jul 2023 at 11:59am

When creating a STEP model, I see a pin one dot for the demo component, but not for the part I'm creating. I'm using version 23.09.
uploads/12761/step_pin1_2023-07-10_11-55-49.zip
]]> Mon, 10 Jul 2023 11:59:02 +0000 https://www.PCBLibraries.com/forum/step-model-pin-one-dot-missing_topic3291_post13144.html#13144