Aluminum printed circuit board is the most common type of metal core PCB, and its base material is made up of aluminum core with standard FR-4. Aluminum PCB includes a thin layer of thermally conductive dielectric material that transfers heat better, and can improve the overall PCB performance to some extent.
Aluminum PCBs also can be called as aluminum clad, aluminum base, metal clad printed circuit boards, insulated metal substrate, and thermally conductive PCBs. Though there are many names, they all mean the same thing and perform the same way.
As shown in the above picture, you can clearly find that the electrically insulating dielectric layer is laminated between the circuit copper layer and aluminum layer. The copper foil is etched into the desired circuit pattern and the metal base draws heat away from this circuit through the thin dielectric.
Aluminum PCBs can be used for many applications, so you can easily find them in power converters and LEDs. Aluminum PCBs also have many types, including hybrid aluminum PCBs, multilayer aluminum PCBs, through-hole aluminum PCBs, and flexible aluminum PCBs.
Aluminum PCBs have several superior benefits, and they are as follows: better heat dissipation than standard FR-4 material; the dielectrics used are typically 5 to 10 times as thermally conductive as conventional epoxy-glass but only with a tenth of the thickness; more efficient thermal transfer than conventional rigid PCBs; lower copper weights and cheaper cost.