Silkscreen Polarity Marking Pin 1 Indication

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   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. 

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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: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Topic: Silkscreen Polarity Marking Pin 1 Indication 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.
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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: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply 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.
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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: 5718	Post Options Post Reply Quote Tom H Report Post Thanks(0) Quote Reply Posted: 07 Apr 2024 at 3:09pm
	Connector Polarity Marking general guidelines.
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