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Axial LeadForm Calculator

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: http://www.PCBLibraries.com/forum/forum_posts.asp?TID=2890
Printed Date: 20 Feb 2024 at 9:41pm


Topic: Axial LeadForm Calculator
Posted By: victorp06
Subject: Axial LeadForm Calculator
Date 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



Replies:
Posted By: Tom H
Date 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 - http://www.pcblibraries.com/downloads" rel="nofollow - www.pcblibraries.com/downloads



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Posted By: victorp06
Date Posted: 22 Apr 2021 at 4:38pm
Thanks you so much Tom! I'll definitely download the new version.



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