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SMTnet Express January 24, 2013, Subscribers: 26136, Members: Companies: 9096, Users: 34208

An investigation into low temperature tin-bismuth and tin-bismuth-silver lead-free alloy solder pastes for electronics manufacturing applications

The electronics industry has mainly adopted the higher melting point Sn3Ag0.5Cu solder alloys for lead-free reflow soldering applications. For applications where temperature sensitive components and boards are used this has created a need to develop low melting point lead-free alloy solder pastes.

Tin-bismuth and tin-bismuth-silver containing alloys were used to address the temperature issue with development done on Sn58Bi, Sn57.6Bi0.4Ag, Sn57Bi1Ag lead-free solder alloy pastes. Investigations included paste printing studies, reflow and wetting analysis on different substrates and board surface finishes and head-in-pillow paste performance in addition to paste-in-hole reflow tests. Voiding was also investigated on tin-bismuth and tin-bismuth-silver versus Sn3Ag0.5Cu soldered QFN/MLF/BTC components. Mechanical bond strength testing was also done comparing Sn58Bi, Sn37Pb and Sn3Ag0.5Cu soldered components. The results of the work are reported.

First published in the 2012 IPC APEX EXPO technical conference proceedings.

by: Jasbir Bath, Manabu Itoh, Gordon Clark, Hajime Takahashi, Kyosuke Yokota, Kentaro Asai, Atsushi Irisawa, Kimiaki Mori, David Rund, Roberto Garcia,; Koki Company Limited., Christopher Associates

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Forum search results for related keywords: lead-free solder alloy, sensitive component, low melting point, voiding

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Internet Marketing tip of the week

Internet Marketing Article 01-24-2013

Not being top in search results pages nowadays is like not being at the trade shows in the 70-90's.

There is no question whether you SHOULD spend a large portion of your marketing/advertising dollars on the web. The question is, why isn't your company moving more of its budget to online marketing?

Is your company scared of the detailed statistical feedback including insights to individual behaviors? The web can help your company obtain visibility in front of the right people - those who are looking for exactly what you sell.

The web can also reinforce brand recognition and prevent your company from losing market share. A sad but true story follows... one of my friends who is not an avid internet user (but when he does use the internet, he often researches products and buys online) said something that shocked me. We were discussing how being at the top of the search engines is very important to businesses worldwide and he said, "well, aren't the largest and best companies on top of the 1st page?". This basically means he was giving product legitimacy to companies who came up at the top of the search engines. Needless to say, this blew me away but then I started thinking.... If the largest companies actually spent what they should on the internet, he would probably be right. However, this is not the case and small companies are eroding brand power and market share away from the 'big boys' that don't invest in the internet the way they should... »»»

Roland Girouard, Managing Director, SMTnet

The SMTnet.com marketing team provides internet marketing consulting services for the SMT Industry.

Contact us for more information »

DesignCon 2013
Jan. 29., Santa Clara, CA, USA

APEX Expo 2013
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Industry Associations Events

SMTA - Surface Mount Technology Association is a non-profit international association of companies and individuals (totalling 4,000) involved in all aspects of advanced electronics assembly, surface mount and related technologies. Membership Info | SMTA Certification | Bookstore

Next Event: Webinar (Free for Members!) Voiding Control and Reliability of Solder Joints with Backward Compatibility - February 7

IPC - Association Connecting Electronics Industries is a US-based trade association dedicated to the competitive excellence and financial success of its nearly 2,600 member companies which represent all facets of the electronic interconnection industry, including design, printed wiring board manufacturing and electronics assembly. Membership Info | Training & Certification Programs | Standards & Publications - Online Store

Next Event: IPC Conference on Solderability and Reliability for Electronics Assemblies - February 6-7

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Newsletter Editor - Anna Girouard

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