3D STEP Model Polarity Dot Missing on SOICs

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   SOT 3D STEP models don’t have a polarity dot because the component manufacturers don’t have one on their physical packages.
Polarity Dots on component packages are intended for assembly shops to prevent inverting the component placement. 

Packages that have odd pins where it’s impossible to invert the assembly attachment. 

A 3-pin SOT23 does not need a polarity dot. 

A 4-pin SOT143 can’t be inverted.

A SOT223 cannot be inverted.

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Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5899	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 23 Sep 2025 at 8:08pm
	SOT 3D STEP models don’t have a polarity dot because the component manufacturers don’t have one on their physical packages. Polarity Dots on component packages are intended for assembly shops to prevent inverting the component placement. Packages that have odd pins where it’s impossible to invert the assembly attachment. A 3-pin SOT23 does not need a polarity dot. A 4-pin SOT143 can’t be inverted. A SOT223 cannot be inverted.
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m.elsayed Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 22 Sep 2016 Status: Offline Points: 126	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Posted: Yesterday at 2:12am
	Please provide more details for this note "Some 3D models may not support the polarity dot" it added for all the packages below it will be great if have document explains this point so i can be aware by this concept

m.elsayed Members Profile Send Private Message Find Members Posts Add to Buddy List Advanced User Joined: 22 Sep 2016 Status: Offline Points: 126	Post Options Post Reply Quote m.elsayed Report Post Thanks(0) Quote Reply Posted: Yesterday at 2:27am
	also lease provide more details for this note "Some 3D models may not support the polarity dot" it added for all the packages below it will be great if have document explains this point so i can be aware by this concept

Tom H Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5899	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: Yesterday at 8:14am
	If the 3D Color panel in the Calculator has 'Primary Polarity' then the 3D STEP model will have polarity. If there is no 'Primary Polarity' button then there is no polarity dot.
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