Differences between copper-based PCB circuit boards and ordinary FR4 glass fiber PCB circuit boards

The copper substrate PCB is the most expensive one of the metal substrates PCB, and its heat conduction effect is many times better than that of the aluminum substrate/core/base PCB and the iron substrate/core/based PCB. It is suitable for high-frequency circuits and regions with high and low temperature variations and the heat dissipation and architectural decoration industries of precision communication equipment.

Generally, there are a gold-plated copper substrate PCB circuit Board, a silver-plated copper substrate PCB circuit board, a tin-plated copper substrate PCB circuit board, an anti-oxidation copper substrate/base PCB circuits board, and so on.

The copper substrate PCB circuit board circuit layer is required to have a large current carrying capacity, so thick copper foil should be used, and the thickness is generally 35μm~280μm; the thermal conductive insulating layer is the core technology of the copper substrate, and the core thermal conductive component is aluminum oxide and silicon powder. It consists of a polymer filled with epoxy resin, low thermal resistance (0.15), excellent viscoelasticity, resistance to heat aging, and ability to withstand mechanical and thermal stresses. The copper substrate metal base layer is a supporting member of the copper substrate, and is required to have high thermal conductivity, generally a copper plate, which is suitable for conventional mechanical processing such as drilling, punching and cutting, and the metal layer (block) mainly serves as heat dissipation, shielding, covering or Grounding, copper substrates have more performance advantages than aluminum substrates due to the difference in copper and aluminum properties and the corresponding PCB processability.

The high-frequency board is usually pressed with FR4 fiberglass board, and is pressed by a whole piece of epoxy glass cloth. The whole board is uniform and bright in color. The density is larger than the low-frequency board, which is the weight point.

Many low-frequency PCB circuit boards are made of low-end materials, such as paper substrates, composite substrates, epoxy boards (also known as 3240 epoxy boards, phenolic boards), FR-4 glass fiber boards (separation boards), and paper substrates. And the composite substrate, the overall density is low, the back color is the same, but it is easy to see that there is basically no glass fiber cloth inside the substrate. The difference between the epoxy board and the FR4 glass fiber board is that the color of the back substrate is different. The epoxy board is cut at the break, with a hand or other tool, it is easy to see the white powder, the color is beige of. The FR4 panel is easier to see because it is pressed with the trim of FR4 fiberglass cloth and a large strip of stripe can be seen on the back of the board.