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Dimensional Principles of IPC-7351B |
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drj-bbe 
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 Topic: Dimensional Principles of IPC-7351BPosted: 04 Aug 2015 at 1:25am |
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Hello Tom,
There is a dimension "Amax" indicated in below principles of IPC-7351B, see below picture. But it seems there is no drawing to define which size is for "Amax". Could you please help on this question? Thanks
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Tom H
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Posted: 04 Aug 2015 at 6:08am |
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This condition creates a Outward L lead -
 This lead style has a different calculation then the normal Gull Wing lead style:  |
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drj-bbe
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Posted: 04 Aug 2015 at 6:38pm |
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I have mark Amax and Smin below, is it correct?  |
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Tom H
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Posted: 04 Aug 2015 at 7:52pm |
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Please download the SMD Reference Calculator.
All values and dimensional assignments are displayed. You can change the calculation values and observe the resulting land pattern results. Download here - |
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drj-bbe
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Posted: 04 Aug 2015 at 8:11pm |
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I cann't find dimension "A" mentioned above in SMD reference calculator. It seems only for chip component.
Could you tell me which size is for the dimension "A" ?
Thanks.
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Tom H
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Posted: 05 Aug 2015 at 8:27pm |
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Sorry for the late reply especially for such a simple question, it's been really busy lately.
Amax = the Lead Span  3D model created by Library Expert. |
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Tom H
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Posted: 05 Aug 2015 at 8:57pm |
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This picture illustrates what the IPC-7351B text condition for Gull Wing lead is referring to.
When the Terminal Leads bend inward.  |
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