What is copper based PCB?
1. What is copper based PCB?
A standard printed circuit board (PCB) relies on a base layer typically made of fiberglass.
We often named it as FR-4 PCB. While this material operates well in normal conditions, it often sustains damage in high-power applications. Metal core circuit boards, such as copper core PCBs, offer the durability and conductivity you need for high-temperature uses.
Meidear PCB can create a copper core PCB for your project to deliver superior results at an ideal cost.
How are copper pcbs made out?
Copper core circuit boards are a type of metal core PCB. With their layered design using a copper base, these PCBs offer superior thermal conductivity.
Circuit layer:
Copper foil makes up the circuit layer, and these often range from 1 to 10 ounces.
Dielectric layer:
An added dielectric layer absorbs the heat that travels through the circuit layer and sends it to the copper substrate for dispersion.
Thermal insulation layer:
Copper core PCBs use prepreg or another high thermal conductivity insulation to improve heat transfer.
Base layer:
The base layer is made of a copper substrate that offers high thermal conductivity and heat transfer.
When it comes to metal core PCB, there are three types of materials in metal core PCB, such as aluminum PCB, copper based PCB, iron based PCB. However, as the high power electronic components have a great demand for PCB heat dissipation, the need for metal core PCB in the market is also increasing, what’s more, there is a higher processing demand for copper based PCB, which is widely used in the field where has a high power and high frequency PCB design. Because copper based PCB needs to have a great current carrying, it needs a thick copper foil, in general, the thickness of copper foil is 35μm~280μm. Copper based PCB can be etched the fine pattern and processed into a convex platform, the component can be connected to the platform so that it makes a great effect on grounding and heat dissipation.
2. The types of copper based PCB
Immersion gold copper based PCB
Silver plating copper based PCB
Hot air soldering leveling (HASL) copper based PCB
Anti-oxidation copper based PCB
3. The advantages of copper based PCB
Comparing to aluminum PCB, copper based PCB has a great thermal conductivity which is the twice higher than aluminum PCB, the higher thermal conductivity is, the higher heat conduction is, as well as the better heat dissipation is. And copper base can be plated though hole but aluminum base can not, however, it needs to be the same for the network of plated through hole so that the signal has a great grounding property, still, the copper has the solderability to mount and solder the structural component of design in the end. What’s more, the copper base on the copper based PCB can etch a great drawing, there will a boss shape after processing, which is good for component, needless to say, the component can be directly pasted on the boss so that make a great effect on good grounding and heat dissipation. Because there is a different modulus of elasticity between copper and aluminum, such as for copper, its modulus of elasticity is about 121000MPa, but aluminum is about 72000MPa, and the warping and shrinking of copper based PCB is smaller than aluminum PCB, which has a more stable property.
Low thermal resistance and high pressure resistance
Excellent dimensional stability
good heat dissipation
Non-magnetic
High mechanical strength
Good viscoplastic property
Ability to withstand thermal aging
4. Thermoelectric separation copper based PCB
1）. Apply to copper base, for based PCB, there is a high density and has a strong thermal load carrying ability and great heat conduction and heat dissipation.
2）. Use the thermoelectric separation structure, and is in contact with zero thermal resistance to the lamp bead. So it can prevent the attenuation of lamp bead light from reducing and extend lamp life.
3）. For copper base, it has a high density and great thermal load carrying ability, as well as smaller size at the same power.
4）. Suitable for matching single high power lamp bead, especially COB package so that make a better effect.
5）. It can do various surface finish based on different demands, such as immersion gold, OSP, hot air soldering leveling (HASL), silver plating, immersion silver + silver plating, there has a great reliability on the layer of surface finish.
6）. It can make different structure according to different design needs of the lamps, such as copper bumps, copper concave block, the parallel thermal layers and circuit layers.
