Beryllium
oxide (BeO) is useful for circuits which must dissipation large
amounts of heat. The thermal conductivity is 248 W/m-K which is
higher than alumina or aluminum nitride. It has a fairly low dielectric
constant for a ceramic circuit substrate, 6.5. The primary limitation
is the potentially hazardous dust. Precision Surface Technology’s
engineers are prepared to discuss tradeoffs in the properties
of various ceramics in the design of circuits requiring heat
dissipation
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