Beryllium Oxide (Beryllia) Substrates
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:
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
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: