From the level of substrates, ceramic PCBs include the aluminum, AIN, BeO, Si₃N₄, hybrid substrate boards, etc. From the layers of the circuit boards, there are the single-layer, double-layer, and multilayer.
Ceramic PCBs are usually made up of ceramic cores, with alumina and aluminum nitride (AIN) being two of the primary types. Both of these kinds of boards provide better thermal performance than metal core PCBs because there isn’t a need for an electric layer between the core and the circuits. Find out more about these two main kinds of ceramic PCB types below:
For high thermal conductivity, aluminum nitride boards are ideal, providing greater than 150 w/mK. AIN is a top choice for many other reasons as well, such as its good dielectric properties, non-reactiveness with various semiconductor process chemicals and low CTE.
Since aluminum nitride boards are expensive, those opting for less expensive ceramic PCBs may find themselves with Alumina boards. These PCBs are made out of aluminum oxide and offer about 18-36 w/mK.
Frequently Asked Questions
What are the primary substrate materials used in ceramic PCBs?
Ceramic PCBs are categorized by substrates including Alumina (Al2O3), Aluminum Nitride (AlN), Beryllium Oxide (BeO), Silicon Nitride (Si₃N₄), and hybrid substrate boards.
Why do ceramic PCBs offer better thermal performance than metal core PCBs?
Ceramic PCBs perform better thermally because they eliminate the need for an electrical insulation layer between the core and the circuits, allowing direct thermal dissipation.
What is the thermal conductivity of Aluminum Nitride (AlN) boards?
Aluminum Nitride (AlN) boards offer high thermal conductivity, providing values greater than 150 W/mK, which is ideal for high-power thermal management.
How does Alumina compare to Aluminum Nitride in terms of cost and performance?
Alumina boards are a more cost-effective choice compared to the more expensive AlN boards. However, Alumina offers a lower thermal conductivity range of approximately 18-36 W/mK.
What layer configurations are available for ceramic PCBs?
Ceramic PCBs can be manufactured in single-layer, double-layer, and multi-layer circuit board configurations depending on the design requirements.
What are the additional benefits of using AlN substrates?
Beyond high thermal conductivity, AlN features excellent dielectric properties, a low Coefficient of Thermal Expansion (CTE), and non-reactiveness with various semiconductor process chemicals.
