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Crystal, Side & Heel fillets

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=1362
Printed Date: 07 Oct 2024 at 7:54pm


Topic: Crystal, Side & Heel fillets
Posted By: RandyB
Subject: Crystal, Side & Heel fillets
Date Posted: 13 Jun 2014 at 1:21pm
The default heel and side environment settings for Crystals produce unusually wide side fillets and a minimal heel fillet.   This does not seem consistent with other part types.   Normally the side fillet is minimal and heel fillet is more robust.   Why is the the crystal so different?  Is there perhaps a problem with the default environment settings for crystals?
 
Thanks!


Replies:
Posted By: Tom H
Date Posted: 13 Jun 2014 at 1:30pm

Crystals use the same lead form solder joint rules as the Aluminum Electrolytic Capacitor.

Compare the mfr. recommended pattern with the IPC calculations to see if they're close.

2 Pin parts have the luxury of not having pins side by side so the pad width can be larger.

90% of the Crystal component solder joint is under the package and cannot be visually inspected.



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