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Silkscreen Polarity Marking Pin 1 Indication

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Tom H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post 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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 07 Apr 2024 at 3:09pm
Connector Polarity Marking general guidelines. 


 
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