Aluminum PCB is a type of ims substrate which made of metal-based copper-clad laminate with good heat dissipation function, and generally single-sided Aluminum PCB is composed of three Structural layers, namely the circuit layer (copper foil), the insulation layer and the metal base layer. For high-end use, there are also designs that are double-sided, and the structure is circuit layer, insulation layer, aluminum base, insulation layer, and circuit layer. Very few applications are multi-layer boards, which can be made of ordinary multi-layer boards laminated with insulation layers and aluminum bases.
Referring to the picture above, aluminum PCBs can be divided into single-sided aluminum PCBs, double-sided aluminum PCBs, and multi-layer aluminum PCBs according to the number of layers, while double-sided and multi-layer aluminum PCBs are divided into two types, one is aluminum base pcb with aluminum plate at the bottom layer, and the other is aluminum core pcb with aluminum plate in the middle.
Aluminum base PCB has better heat dissipation performance, and its heat dissipation surface is basically equivalent to the area of the whole board, so it is more widely used. The disadvantage of aluminum base pcb is that it cannot achieve double-sided SMT, because one side is aluminum plate.
Aluminum core PCB is a sandwich structure of aluminum PCB, the heat dissipation surface is tightly at the edge interface of the board, so it is generally used in products with light heat dissipation requirements, and the advantage is that it can be double-sided SMT.
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In the field of electronics, aluminum PCBs are widely used in the manufacture of LED lights, power supplies, automotive electronics and other products. Its thermal conductivity can effectively dissipate heat and ensure the stable operation of the equipment.
The manufacturing of aluminum printed circuit boards （aluminum PCB） is not much different from traditional PCBs, and to a certain extent, it is relatively simple, because the circuits of aluminum printed circuit boards are relatively simple and wide, but some applications require thick copper materials. In addition, the manufacture of multi-layer aluminum printed circuit boards requires the aluminum plate to be isolated from the vias, otherwise it will be short-circuited, so it is generally necessary to drill a large hole first, then fill in the resin, and finally drill a small hole in the large hole filled with resin to conduct it.
The main application scenario of aluminum pcb is electronic products with high heat dissipation requirements, while FR4 PCB is relatively more widely used.
The production process of aluminum pcb is roughly the same as that of FR4 PCB, the difference is that the shape processing of aluminum pcb is more difficult, which is easy to understand, because aluminum is relatively hard, especially to the alloy aluminum.
In terms of cost, the cost of conventional aluminum pcb is not much different from FR4 PCBs, but when the thermal conductivity increases, the cost of aluminum pcb will increase significantly.
Finally, the circuit pattern of the aluminum pcb is generally simpler than that of the FR4 PCB, that is, the circuit is relatively wide.