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Date: | Fri, 08 Sep 1995 08:21:37 EDT |
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In agreement with Tom's comments, the major difference is in the
thermal properties of the laminate, not only Tg, but max operating
temperature. Typical value for FR-4 maximum operating temp is 130C,
while FR-5 is 170C. Electrical properties are nearly identical, and
some physical properties are significantly different. A solder float
test value for FR-5 is about 2 times the tolerance of FR-4, and
dimensional stability of the FR-5 is superior to FR-4. FR-5 can meet
many of the tough requirements for military and commercial high
density SMT applications.
David Mander
Sun Coast Supply
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