PCB Libraries Forum : Silkscreen Polarity Marking Pin 1 Indication https://www.PCBLibraries.com/forum/ Tue, 14 Apr 2026 11:12:41 +0000 Sun, 07 Apr 2024 15:09:08 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.07 360 https://www.PCBLibraries.com/forum/RSS_post_feed.asp?TID=3373 <![CDATA[PCB Libraries Forum]]> https://www.PCBLibraries.com/forum/forum_images/PCBLForumLogo.gif https://www.PCBLibraries.com/forum/ <![CDATA[Silkscreen Polarity Marking Pin 1 Indication : Connector Polarity Marking general...]]> https://www.PCBLibraries.com/forum/silkscreen-polarity-marking-pin-1-indication_topic3373_post13491.html#13491 Author: Tom H
Subject: 3373
Posted: 07 Apr 2024 at 3:09pm

Connector Polarity Marking general guidelines. 


 
]]> Sun, 07 Apr 2024 15:09:08 +0000 https://www.PCBLibraries.com/forum/silkscreen-polarity-marking-pin-1-indication_topic3373_post13491.html#13491 <![CDATA[Silkscreen Polarity Marking Pin 1 Indication : The Assembly Outline is a closed...]]> https://www.PCBLibraries.com/forum/silkscreen-polarity-marking-pin-1-indication_topic3373_post13490.html#13490 Author: Tom H
Subject: 3373
Posted: 07 Apr 2024 at 3:06pm

The Assembly Outline is a closed polygon with an assembly reference designator inside it.

The simplest Assembly Polarity Marking Pin 1 Indication is a chamfer in the corner closest to Pin 1. 


 
]]> Sun, 07 Apr 2024 15:06:25 +0000 https://www.PCBLibraries.com/forum/silkscreen-polarity-marking-pin-1-indication_topic3373_post13490.html#13490 <![CDATA[Silkscreen Polarity Marking Pin 1 Indication : Polarity Marking not necessary...]]> https://www.PCBLibraries.com/forum/silkscreen-polarity-marking-pin-1-indication_topic3373_post13489.html#13489 Author: Tom H
Subject: 3373
Posted: 07 Apr 2024 at 3:02pm

Polarity Marking not necessary for packages that can be inverted during assembly (like a resistor). 

The minimum Dot diameter should be 0.40 mm. Anything smaller is too hard to see during the Post Assembly Inspection process. 

The range for Dot sizes is 0.40 – 1.00. The Dot diameter should be the same value as the pad width but keep it within the range. 

A dot is normally used, but other symbols like square and triangle can be used. On very dense part placement boards, a line drawn the length of pin 1 can be used, but it's hard to identify it as a pin 1 polarity marker. 


 
]]> Sun, 07 Apr 2024 15:02:01 +0000 https://www.PCBLibraries.com/forum/silkscreen-polarity-marking-pin-1-indication_topic3373_post13489.html#13489