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Tolerance |
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Hassan Moaaz 
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Joined: 05 Sep 2016 Status: Offline Points: 22 |
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 Topic: TolerancePosted: 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  |
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Tom H
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Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5949 |
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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. |
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Batiskaff
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Joined: 30 Apr 2018 Status: Offline Points: 65 |
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Posted: 30 Apr 2018 at 4:50am |
+1 good question. How to сreate SOT-89? |
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Tom H
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Joined: 05 Jan 2012 Location: San Diego, CA Status: Offline Points: 5949 |
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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. |
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Hassan Moaaz wrote: