Hi Jae-heun,
I sure have not come across the acronyms "BVH" and "IVH" before; I take it
that VH stands for via hole, B perhaps for blind, but what is "I"?
I do not know of any reliability studies on blind vias. As a first step and
until more definitive information is available, I would apply the information
in IPC-D-279, "Design Guidelines for Reliable Surface Mount Technology Printed
Board Assemblies", Appendix B, to blind vias. Considering the construction,
the loading on blind vias during soldering processes will be significantly
less than for PTVs, and therefore the minimum copper plating thickness is most
likely defined by functional or manufacturing requirements, not reliability
issues.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask]

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