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Investigation of Pad Cratering in Large Flip-Chip BGA using Acoustic Emission

SMTnet Express January 3, 2013, Subscribers: 26072, Members: Companies: 9076, Users: 34113

Technical Library

Investigation of Pad Cratering in Large Flip-Chip BGA using Acoustic Emission

by: Anurag Bansal, Cherif Guirguis, Kuo-Chuan Liu; Cisco Systems

Electronics assemblies with large flip-chip BGA packages can be prone to either pad cratering or brittle intermetallic (IMC) failures under excessive PCB bending. Pad cratering cracks are not detected by electrical testing or non-destructive inspection methods, yet they pose a long term reliability risk since the cracks may propagate under subsequent loads to cause electrical failure. Since the initiation of pad cratering does not result in an instantaneous electrical signature, detecting the onset of this failure has been challenging. An acoustic emission methodology was recently developed by the authors to detect the onset of pad cratering. The instantaneous release of elastic energy associated with the initiation of an internal crack, i.e., Acoustic Emission (AE), can be monitored to accurately determine the onset of both pad cratering and brittle intermetallic (IMC) failures.

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

read article »

Forum search results for related keywords: pad cratering, BGA, IMC

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Internet Marketing tip of the week

The new the 'buying' cycle... Buyers almost ALWAYS do a search to compare and contrast features and/or prices when making a major purchase decision.

Furthermore, we recently reviewed that searcher is almost guaranteed to NOT go past the first 2 pages of search engine results (95% of searchers do not go past the 2nd page of search engine results, or top 20 - Source: Nielsen Net Rankings).

This week we will review the most important external factor that affects search engine rankings. The number one external factor that affects your rankings in search engines is proper linking to your website.

Links serve as a sort of "vote" for a web page & website. However, search engines deem links from relevant, popular sites to yours as 'important links'. Therefore, industry specific advertising can be very effective in the reinforcement of your search marketing efforts and a link from SMTnet can be deemed as more important than a link from a non-relevant, non-popular website.

Increasing your web site popularity through increasing the amount of important inbound links is an imperative, especially for Google. SMTnet can help your company with the creation of these important inbound links by linking from your product catalog to your website. Read more....

Roland Girouard, Managing Director, SMTnet

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

Contact us for more information »

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NEPCON JAPAN 2013 � 42nd Electronics R&D and Manufacturing Technology Expo
Jan. 16., Tokyo, Japan

APEX Expo 2013
Feb. 19., San Diego, CA, USA

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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: Webtorial - Design and Assembly Process Challenges for Bottom Terminations Components (BTCs) such as QFN, DFN and MLF in Tin-Lead & Lead Free World - January 15 & 22


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Next Event: Printed Board Assembly Cleaning and Contamination Defect FREE webinar - January 10

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