Introduction of Metal Core PCB and Multilayer PCB
Metal core PCBS, also called mcpcb board, insulated metal substrate (IMS) or heat dissipation PCBS, is one of the most widely used PCBs today. These PCBs have applications in various industrial electronic equipment. You may ask how these pcb printed circuit boards are different from regular PCBs. What are their advantages over standard CEM3 or FR4 PCB.
Ⅰ. Basic introduction of metal core PCB
1. The basic structure of metal core PCB includes: solder mask, circuit layer, copper layer, dielectric layer, metal core layer, and heat sink.
The base material used in this PCB is metal, not FR4 or CEM3 material. The most commonly used metals for metal core PCB China are aluminum, steel alloys and copper. Aluminum is cheap with good heat dissipation and transmission capabilities. Copper has better heat dissipation and transmission capabilities than aluminum and stainless steel, but it is expensive. Stainless steel is harder than copper and aluminum, and its thermal conductivity is also very low.
Therefore, the choice of metal cores for PCB circuit manufacturers will depend on the applications in which they are used.
2. The types of metal core PCB
According to the position of the metal core and the wiring layer, PCBs are divided into four basic types. They include:
Single-layer MPCB: A PCB with a single etch layer on one side.
Double-layer MPCB: A PCB with two etch layers on the same side.
Double-sided MPCB: These PCBs have two etch layers on each side.
Multilayer metal core PCB: These PCBs have more than two layers per board.
Ⅱ. What is a multilayer PCB?
Multilayer PCBs are stacked by three or more double-sided boards. In theory, they can contain as many boards as needed, but the largest board ever is 129 layers thick. Generally, they have even numbers between 4 and 12 layers-odd numbers may cause problems such as warpage and distortion after soldering.
Each substrate layer in the multilayer board has conductive metal on both sides. PCB circuit manufacturers use special adhesives to connect the boards together, with insulating material between each board. On the outer edge of the multilayer pcb printed circuit board, a solder mask will be found.