We have a four layer (FR-4) board with one ounce copper on all
layers and a six-layer (FR-4) board with two ounce copper pwr and gnd planes and
one ounce on other layers that have recently began developing opens at specific
locations where the thermal spokes on the gnd plane attach to the barrel of the
PTH or PTV.
Microsection show the breaks, and we're looking at some
handling issues during assembly, but I think its likely a thermal issue during
the solder process based mostly on the post I've seen here. We're seeking
information from the assembly house, but don't have that yet. I don't think it's a design issue; the spokes are 15 mils
wide.
What else in design or fabrication or assembly might might be
causing the problem?
Any comments, suggestions, solutions or help would be
appreciated?
Calvin Reynard
Securaplane Technologies
10800 N. Mavinee
Dr.
Tucson, AZ
85737
Voice
520-297-0844
Fax 520-498-4924
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