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Micromechanics of multilayer printed circuit boards

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3 Author(s)
Lee, L.C. ; IBM Systems Technology Division, P. O. Box 6, Endicott, New York 13760, USA ; Darekar, V.S. ; Lim, C.K.

Analytical and experimental techniques are reported for the evaluation of micromechanical components in multilayer printed circuit boards. The concern in this investigation comes from the Z-axis thermal mismatch between epoxy-glass and copper that generates stresses when the board is subject to a temperature change. Finite-element modeling for both plated through-holes (PTH) and buried via (PV) structures is used to calculate the stresses in the copper barrel and at the via junctions. A simple experiment is designed to measure the thermomechanical strain in the PTH barrel. Also discussed are the PTH peel and PV pull techniques which have been used to characterize the barrel-laminate adhesion and the via junction strength.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:28 ,  Issue: 6 )