Many small partners who have just touched the PCB industry often encounter the term aluminum substrate. So what is the difference between the aluminum substrate and the PCB board? Today, Xiaojie Ge will explain it to everyone:
Generally, the aluminum substrates that we encounter are single-layer aluminum-based PCB boards, which are one kind of PCB boards. It is suspected that the aluminum substrate has good thermal conductivity, so it is widely used in the LED industry. At present, the most commonly used LED aluminum substrate has two sides, the white side is soldered to the LED pin, and the other side is in the form of aluminum. Generally, the thermal conductive paste is applied and then contacted at the heat conducting portion. A metal-based copper clad laminate having a good heat dissipation function generally consists of a three-layer structure consisting of a circuit layer (copper foil), an insulating layer, and a metal base layer. Also used for high-end use is designed as a double panel, the structure is circuit layer, insulation layer, aluminum base, insulation layer, circuit layer. A very small number of applications are multi-layer boards, which can be made of ordinary multi-layer boards combined with an insulating layer and an aluminum base.
The PCB boards we say most are generally copper substrates, and are also divided into single-layer boards and multi-layer boards according to the number of layers. Compared with aluminum substrates, copper substrates and aluminum substrates are relatively good in heat dissipation. Therefore, it is relatively more expensive in terms of PCB pricing. It should be noted here that the aluminum substrate cannot be used as a via. Therefore, it is very easy to see whether the board is an aluminum substrate through the finished board of the PCB!