National Physical Laboratory

Improving Electronic Reliability - Through Product and Process Qualification at NPL (webinar series)

NPL's Electronic Interconnection Group is presenting a new series of technical webinars in 2015.

Recordings of previous webinars are available here

This Group is internationally recognised for its practical and innovative work on lead-free reliability, PCB interconnection failures, tin whisker migration and conformal coating research.

These FREE online webinars provide the opportunity to draw on years of practical experience without the participant needing to leave his/her desk - to participate, all that is needed is a phone line and Internet access. Please note that registration is essential.

Each webinar lasts approximately 60 mins (and is limited to 100 delegate/company registrations). After the webinar, participants receive a copy of all of the slides and a listing of all relevant technical reports which can be downloaded for FREE.

Please note that all webinars are at UK time - check local time in other countries here

CAF Conductive Anodic Filaments - How to Avoid Failure
Presented by Ling Zou, NPL

Monday 16 November 2015 (14:30 hrs UK time)

Book your place here

Conductive Anodic Filamentation (CAF) is a subsurface failure mode for woven glass-reinforced laminate (FR4) materials, in which a copper salt filament grows and results in a consequential electrical short between plated through-hole (PTH) walls or adjacent copper planes. In this webinar we cover FR4 laminates, in the form of high PTH density multi-layer test circuits, exposed to different manufacturing conditions and studied for resistance to CAF initiation and growth. CAF performance was assessed using high temperature and humidity conditions to promote failures, with a voltage applied across adjacent vias. By application of a range of voltages and via geometries, the basis for a performance map for laminates was obtained for use in materials comparison. The changes due to exposure of laminates to lead-free temperatures and other processing steps were then examined using the technique, and a number of important recommendations made regarding minimising the possibility of CAF initiation and growth. A new approach to characterise CAF processes has been developed using a Simulated Test Vehicle (STV). The STV, can be easily built under controlled condition in the laboratory using different glass fibres and resin power to investigating effect of different variables on CAF separately. The advantage of STV will be described and examples of material studies that can be undertaken presented.

Topics covered:

  • What is CAF?
  • How does failure occur?
  • Testing techniques
  • Testing performance
  • Failure modes
  • Design and its impact on CAF
  • Latest research work on CAF

This webinar will run for between 45-60 minutes, with a Q&A session. The webinars are limited to 100 delegates/companies. A copy of each of the slides presented and links to NPL reports will be provided after the webinar.

Last Updated: 17 Sep 2015
Created: 4 Apr 2011


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