Heavy Copper PCB
- A heavy copper PCB is a board that uses a heavy copper circuit.
- You can also call it a thick copper PCB. After all, the copper weights range from 4 oz/ft2 to 20 oz/ft2.
- Plus, it comes with different perks like cost-effectiveness (long-term), low impedance power distribution, etc.
What Is Heavy Copper PCB?
A heavy copper PCB is a board that uses a heavy copper circuit. This type of PCB undergoes special etching and plating methods like differential etching and step plating. You can also call it a thick copper PCB. After all, the copper weights range from 4 oz/ft2 to 20 oz/ft2.
So, with the thick copper board, there’s no need to produce high-current/high-power circuits and control circuits on different boards. Also, the thick copper plating comes with a highly dense and simple board structure.
And it’s possible to integrate control circuits and high-power circuits on the same board. Plus, it comes with different perks like cost-effectiveness (long-term), low impedance power distribution, etc.
Some parts of the board that have heavy copper deposition can serve as heat sinks. Besides, you can interface it to cold plates as well.
Heavy Copper PCB/ Thick Copper
We’re one of the leading thick copper circuit board producers in China. So, here’s a table explaining the capacity of our boards:
Outline:V-cut, punching, routing
Holes:Maximum AR (Aspect Ratio) of holes – 10:1 Minimum drill bit hole size – 0.012” Minimum hole size: 0.008” + 0.005” / -0.008”
Minimum silkscreen line width:8 MIL
The material at the base:Aluminum, Polyamide, FR/4 all TGs, Copper, Ceramic, Teflon
Thickness of Copper:4 – 10 Oz
Number of layers:2 – 16
Vias:Buried and Blind
Surface finishing:HASL, OSP, and immersion Gold
Controlled impedance:+/- 10%
Maximum panel size:22.8" by 18.9"
Quality grade:Standard IPC 2
Finished thickness:0.020" – 0.275"
Minimum solder dam width:5.5 MIL
Minimum Soldermask clearance:6 MIL
Applications of Heavy Copper Circuit Board
Power line monitors
Solar power converters
Power converters for railway electrical systems
Nuclear power applications
Safety and signal systems
High power rectifiers
Power supplies for radar systems
Excitation systems for power regulators
PCB Copper Thickness
Why do you need a PCB copper thickness calculator?
Well, the tool is a vital design parameter in PCB design. That is, it helps you to know the right amount of current that you need to transport without overheating and damaging your board.
It also helps to give you an estimate for a particular current and copper weight. Plus, you should note; when you have a higher current, it would need thicker traces. Also, when you have a thicker copper weight, it permits thinner traces.
Heavy Copper PCB Design
Before you dive into the design process of thick copper PCB, it’s crucial to consider parameters like:
The type of parts
Here is a table that summarizes the dimensions:
|Criteria||Baseline thickness of copper foil|
|Loss (mils/mm)||Ca. 3 / 0.08||Ca. 5 / 0.13||Ca. 6 / 0.15||Ca. 7 / 0.18|
|Minimum spacing (mils)||13||15||20||27|
|Minimum path width (mils)||12||14||18||25|
With these parameters in mind, you can do the following:
1. Take note of the copper fill levels in the inner layers. The reason for this is to avoid very low fill levels. If this happens, at low resins levels, voids will occur between the layers of the board. And it will result in delamination.
2. It’s best to pick the number and types of prepregs with software that helps you achieve multilayer build-up designs.
3. The galvanic coating is important. And considering that you’re dealing with a heavy copper PCB, you’ll use more galvanic copper.
4. Ensure that the layers of your solder resist are thick. That way, you’ll adequately guard the mosaic edges. For instance, your final circumferential thickness should have a value of at least 0.25mm higher than its initial thickness.
Your Heavy Copper PCB Manufacturer
One thing is certain about heavy copper PCB—it needs special technology to achieve the best results. And despite the challenges involved in its fabrication, we deliver quality at the best price.
Plus, we have been in the business for years. So, you can count on our experience to build the best PCB based on your specifications. Our expertise doesn’t stop at PCB assembly. We conveniently handle small to a large volume of board fabrication. While at it, we stay committed to following strict standards
FAQs of Thick Copper PCB
The internal layer of a standard PCB usually has about 1 ounce of copper which translates to approximately 35µm thickness. But, the finished copper weight selection is 2 ounces which is approximately 75µmn in thickness.
You can choose the thickness of PCB copper by determining the width. So, if the width can put up with the average to maximum operating temperature, that's the thickness.
You can remove unwanted copper from a PCB by etching. The procedure is subtractive. And it involves using a temporary mask to protect the wanted parts of the laminate. Then proceed to use acid to remove unwanted copper while the other parts are protected.
The reason why copper is a thing in the PCB world is that the element transmits signals effectively. And in the process, it doesn't lose electricity.
Base copper weight refers to the quantity of copper that's present on the PCB before plating.