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| Created: 07/27/2004 |
Product: Ceramic |
| Updated: 08/19/2008 |
Category: Soldering
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Are tin whiskers a concern for your ceramic military products? |
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Description :
Are tin whiskers a concern for your ceramic military products?
Answer :
Tin whiskers are a controversial topic. Many of our military customers prefer terminations which are not pure Sn, and KEMET offers parts in compliance with that preference. Our MLCC are available with a solder-dip Sn60 termination finish, and our leaded ceramics are offered with solder-plated lead wires. We do offer MLCC with matte Sn finish, and we have not seen any field problems with Sn whiskers. Nonetheless, extremely small Sn whiskers can form on Sn-plated MLCC parts, particularly if the parts are used in bonding at low temperatures (below the 232C reflow point of Sn), or in epoxy-bonding applications. KEMET presented a paper titled Whisker Evaluation of Capacitors Mounted with Lead Free Solders at the March 2004 IPC/JEDEC 5th International Conference on Lead Free Electronic Components and Assemblies. For a copy of this presentation, please contact your salesperson or direct your question through KnowledgeEdge.
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