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how to use the SMD reference calculator?

Printed From: PCB Libraries Forum
Category: PCB Footprint Expert
Forum Name: Questions & Answers
Forum Description: issues and technical support
URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=1787
Printed Date: 04 May 2025 at 4:26pm


Topic: how to use the SMD reference calculator?
Posted By: fishoutofwater
Subject: how to use the SMD reference calculator?
Date Posted: 04 Nov 2015 at 1:08pm
Hello, 

This is probably a very silly question, but how do I use the SMD reference calculator? 

Is L/S/T/W information gathered from the package data sheet, and C/X/Y the recommended footprint outlines?

Thank you for your help.


Replies:
Posted By: Jeff.M
Date Posted: 05 Nov 2015 at 9:24am
The purpose of the reference calculator is to help understanding the IPC land pattern calculation as set forth in the IPC-7351 publication.  L, S, T and W are terminal dimensions provided by the component manufacturer.  C, X and Y are the dimensions of the calculated land pattern.
You should refer to chapter 3 of the publication for a full explanation.


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