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Tolerance

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Hassan Moaaz View Drop Down
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    Posted: 11 Apr 2018 at 8:52am
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 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 Posted: 11 Apr 2018 at 10:54am
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 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Batiskaff Quote  Post ReplyReply Direct Link To This Post Posted: 30 Apr 2018 at 4:50am
Originally posted by Hassan Moaaz Hassan Moaaz wrote:

Hello, 

Also How can i generate footprint for package SOT-89 it found in reference but i can't found in tool



+1 good question. How to сreate SOT-89?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Tom H Quote  Post ReplyReply Direct Link To This Post Posted: 30 Apr 2018 at 7:29am
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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