Tolerance
Printed From: PCB Libraries Forum
Category: General
Forum Name: General Discussion
Forum Description: general topics not related to other forums
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=2324
Printed Date: 04 Nov 2025 at 8:01am
Topic: Tolerance
Posted By: Hassan Moaaz
Subject: Tolerance
Date Posted: 11 Apr 2018 at 8:52am
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Hello, Why i can't generate footprint with tolerance not equal plus and minus and when i add values as example below it change automatically As example D = 1 - 0.1 +0.2 ? to be 1.05 +/- 0.15 Also How can i generate footprint for package SOT-89 it found in reference but i can't found in tool  |
Replies:
Posted By: Tom H
Date Posted: 11 Apr 2018 at 10:54am
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When you have different +/- tolerances, enter the Min/Max data instead of Nominal + Tolerance. When you enter the Min/Max data, a new Nominal dimension will be auto generated. The Nominal = the value between the Minimum and Maximum. This will also affect the Footprint Name, which uses the Nominal dimensions. ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |
Posted By: Batiskaff
Date Posted: 30 Apr 2018 at 4:50am
+1 good question. How to сreate SOT-89? |
Hassan Moaaz wrote:Posted By: Tom H
Date Posted: 30 Apr 2018 at 7:29am
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SOT-89 has an irregular shape pin 2 and it's a different shape and size for every mfr. Library Expert cannot auto-generate irregular pad shapes yet as this requires associated copper poly shapes. We manually create SOT-89 and upload them to POD. Check the mfr.'s Diodes and NXP for the Case Code SOT89 or SOT-89 and download those parts. If you have a new SOT-89, we'll be glad to build it for $5 and share it with everyone else for free download. ------------- Stay connected - follow us! https://twitter.com/PCBLibraries" rel="nofollow - X - http://www.linkedin.com/company/pcb-libraries-inc-/" rel="nofollow - LinkedIn |