Beryllium Oxide (Beryllia) substrates have thermal conductivity of 260 W/mk - that makes it the desirable material for high power microelectronic applications. Until fairly recently, this has been the case but now there is a controversy! Is BeO safe? Judge for yourself.
Related
Beryllia Web Pages:
Safety
data for Beryllium Oxide.
Beryllium
Industry Scientific Advisory Committee.
Beryllium
Oxide Substrates Replaced by Aluminum Nitride.
Aluminum Nitride (AlN) Products Update.
Because of the safety controversy
and also the cost, Beryllium Oxide has lost its popularity and Aluminum
Nitride is replacing BeO in numerous applications. Aluminum Nitride
substrates are more expensive than 99.5% Alumina Ceramic substrates but not
that drastically.
Hybrid circuit designers sometimes choose Aluminum Nitride because they are
not sure if alumina has the required thermal conductivity. Other times it is,
of course, an absolute necessity. Beryllium Oxide substrates are being chosen
less and less frequently.
Thermal management substrate related
Web sites:
Return to Home Page: Aluminum nitride substrates, aluminum nitride wafers
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