Tin Whiskers: Electronics' Silent Killer

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SUMMARY

Tin whiskers, tiny splinters that emerge from tin solder and finishes, pose significant risks to electronics, causing failures in critical systems such as missiles, satellites, and nuclear power plants. The phenomenon has resulted in an estimated $10 billion in damages since its discovery in the 1940s. With the European ban on lead in electronic components, the prevalence of tin-based solder increases the risk of whisker growth. Understanding the causes and prevention methods for tin whiskers is essential for maintaining the reliability of electronic devices.

PREREQUISITES
  • Understanding of tin whisker formation in electronics
  • Knowledge of lead-free soldering techniques
  • Familiarity with electromigration and its effects on integrated circuits
  • Basic principles of electronic component reliability
NEXT STEPS
  • Research methods to mitigate tin whisker growth in electronic assemblies
  • Explore the impact of lead-free solder on long-term electronic reliability
  • Learn about electromigration and its prevention strategies in integrated circuits
  • Investigate industry standards and regulations regarding solder materials in electronics
USEFUL FOR

Electronics engineers, product designers, quality assurance professionals, and anyone involved in the manufacturing and reliability of electronic components will benefit from this discussion.

Huckleberry
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They've ruined missiles, silenced communications sattelites and forced nuclear power plants to shut down. Pacemakers, consumer gadgets and even a critical part of a space shuttle have fallen victim.

The culprits? Tiny splinters - whiskers, they're called - that sprout without warning from tin solder and finishes deep inside electronics. By some estimates, the resulting short-circuits have leveled as much as $10 billion in damage since they were first noticed in the 1940s
Florida Today - Sunday, Oct 7, 2007.
http://img48.imageshack.us/my.php?image=tinwhiskersscan2tc0.jpg

Just recently where I work we had a large amount of electronics parts shipped back to us because some terminals had tin plating. I have never seen these tin whiskers before and I can't find a good explanation for what causes them to grow. There is a decent picture of some severe growth in the article.The article also states that Europe has barred lead from most electronic components, and I assume that a tin-based solder will be substituted.

Any ideas on what might cause this, or what will happen as all of these lead free electronics age?
 
Engineering news on Phys.org
I could swear we had a thread on these a while back. I'll have to see if I can find it.

EDIT: Here's one. It has a link to another board with some good links to follow.
https://www.physicsforums.com/showthread.php?t=59813
 
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Electromigration is a serious issue. At my work, we ended up holding up the release of an important product in order to understand and figure out a way to prevent electromigration in an important product (sells in the millions worldwide). Integrated circuit manufacturers had to figure out how to keep electromigration from causing dendritic growth inside ICs way back in the early days as well...

Here's a good intro article at wikipedia.org, with a number of useful links out:

http://en.wikipedia.org/wiki/Electromigration

After you read through some of the references that Fred and I have offered, feel free to post more questions here if you like. Preventing this problem is non-trivial, but do-able if you understand the issues.