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Axial LeadForm Calculator

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victorp06 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote victorp06 Quote  Post ReplyReply Direct Link To This Post Topic: Axial LeadForm Calculator
    Posted: 22 Apr 2021 at 3:21pm
Hi everyone,

I'm trying to use Axial Leadform Calculator of Library Expert version 2016.08 to calculate the pitch for some components. However, it does not match the value I get from IPC 2221a. 

As per IPC-2221A, the values to calculate the bending radius (R) should be as shown below:

R = 1 * max. lead diameter (when max. lead diameter up to 0.8 mm)
R = 1.5 * max. lead diameter ( when max. lead diameter from 0.8mm to 1.2mm)
R = 2 * max. lead diameter ( when max. lead diameter larger than 1.2 mm)

However, when checking Library Expert Axial Leadform Calculator the values are calculated as below:

R = 1.5 * max. lead diameter (when max. lead diameter up to 0.8 mm)
R = 1 * max. lead diameter ( when max. lead diameter from 0.8mm to 1.2mm)
R = 2 * max. lead diameter ( when max. lead diameter larger than 1.2 mm)

Why is that difference? Is Library Expert using a different IPC version?

Additionally, the minimum lead length extension value is calculated as 1.5 * max. lead diameter but I could not find the formula in IPC-2221a. How did you reach to this formula?

Thanks for all your help, Smile
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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: 22 Apr 2021 at 3:40pm
The Axial Lead Form Calculator used IPC-2221B

Also, there was a bug in the pin pitch that was fixed in the V2020 Library Expert. 

And it's correct in the Free V2021 Footprint Expert Pro. 

Please download and install the Free full featured brand-new V2021.03 Footprint Expert Pro - www.pcblibraries.com/downloads

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victorp06 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote victorp06 Quote  Post ReplyReply Direct Link To This Post Posted: 22 Apr 2021 at 4:38pm
Thanks you so much Tom! I'll definitely download the new version.
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