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SMD Land Pattern Calculation For Wave Solder?

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=1746
Printed Date: 18 Nov 2024 at 6:32pm


Topic: SMD Land Pattern Calculation For Wave Solder?
Posted By: drj-bbe
Subject: SMD Land Pattern Calculation For Wave Solder?
Date Posted: 05 Aug 2015 at 7:44pm
Hello,
 
Does Library Expert Pro can calculate SMD land pattern for wave process (SMD components mounted on board with glue, and then go through wave soldering)?
 
Normally, SMD land pattern size will be larger than normal design if use wave soldering.
 
Is there calculation suggested?
 
Thanks


Replies:
Posted By: Tom H
Date Posted: 05 Aug 2015 at 8:42pm
You can define Wave Solder rules in Library Expert > Preferences.
  
The Library Expert FPX file contains these 2 items and everything else is documentation -
  1. Component Dimensions
  2. Mfr. Recommended Patterns

You can create many rule files for Flexible Circuits, Wave Solder, High Density (cellular), Class 3 (medical/military) or user specific preferences for your personal corporate rules.

Use the same FPX file to auto-generate various libraries for every aspect of the electronics industry.
 
You are in 100% control of the resulting footprint and the many different libraries you create.
 
With Library Expert, you have Free access to download hundreds of thousands of parts on-line. There is no need to manually build PCB library parts anymore. Everything is automated.
 


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Posted By: drj-bbe
Date Posted: 07 Aug 2015 at 2:21am
Thanks for your imformation.

Posted By: Tom H
Date Posted: 07 Aug 2015 at 6:27am
The solder joint goals for SMD Wave Solder and Flex Circuit libraries might be an automatic in V2016.
 
IPC states that the same pattern for Reflow can be used for Wave Solder, but I have heard different from component manufacturers and assembly shops.
 
The typical formula for a Wave Solder pad size calculation is -
  1. Heel = 0
  2. Side = 0
  3. Toe = longer than normal
The typical formula for a Flex Circuit pad size calculation is -
  1. Solder Mask define (mask over pad) the Toe and Heel by 0.05 mm
  2. Do not solder mask define the side

 



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