SOP Package 3D Model Pin 1 Dot is Missing
Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=3543
Printed Date: 24 Sep 2025 at 12:44am
Topic: SOP Package 3D Model Pin 1 Dot is Missing
Posted By: m.elsayed
Subject: SOP Package 3D Model Pin 1 Dot is Missing
Date Posted: 23 Sep 2025 at 2:47am
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there is missing for pin 1 marking in generated 3D , can please check in SOP package as example, and check for others packages also generated from tool  corrected ONE  fpx example uploads/11979/SOP_pin1_missing_2025-09-23_02-47-08.fpx" rel="nofollow - uploads/11979/SOP_pin1_missing_2025-09-23_02-47-08.fpx |
Replies:
Posted By: Tom H
Date Posted: 23 Sep 2025 at 8:26am
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SOPs are Metric Pin Pitch packages and they have a Pin 1 Dot. SOICs are Imperial Unit Pin Pitch packages with a Body Chamfer all along the Pin 1 edge. This discriminates SOPs from SOICs.  ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: m.elsayed
Date Posted: 23 Sep 2025 at 12:18pm
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Hi please check fpx file and it let us why there no dot on 3D like only normal 3D for this package uploads/11979/soic_2025-09-23_12-17-05.jpg" rel="nofollow - uploads/11979/soic_2025-09-23_12-17-05.jpg  |
Posted By: Tom H
Date Posted: 23 Sep 2025 at 1:36pm
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This package is not a Metric Pin Pitch SOP. The Package Marking has a Dot and no chamfer on the body. It is a 50 mil (1.27 mm) pin pitch SOIC. These packages were introduced in the early 1980's when the package had a 45 degree chamfer all along the Pin 1 edge. No Polarity Dot. You need to know the difference between Imperial and Metric pin pitch packages. We have no plans on changing this polarity marking concept that been around for the past 35 years. ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: Tom H
Date Posted: 23 Sep 2025 at 1:39pm
Metric Pin Pitch SOPs come in these Pin Pitches:
The Imperial Pin Pitch SOIC Packages come in these Pin Pitches:
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Posted By: m.elsayed
Date Posted: 23 Sep 2025 at 3:54pm
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Thanks alot Tom 1-i don't want change things, just asking if it pin 1 dot can be added along with chamfur so 3D can be matched with the real parts 2- can add more details for other packges which have same concept |
Posted By: Tom H
Date Posted: 23 Sep 2025 at 3:56pm
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The Body Chamfer and the Dot distinguishes the difference between SOP and SOIC. We have no intention on changing this feature. ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |