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Heavy copper PCB – high current PCB that support high temperature thermal cycling


Have you ever experienced explosion, fire, fuming of the PCB and components? Electronic products have parameters. Some of the important parameters include extreme voltage, rated electricity, rated working current, working temperature, etc. Especially large -current and high voltage PCB is very easy to fire when they exceed the load. So how to avoid these situations? We can use heavy copper PCB to increase current conductivity of the board when PCB design.

What is heavy copper PCB?

What-Is-Heavy-Copper-PCBPCBs or printed circuit boards normally use copper as their conducting material, and PCBs in which the thickness of copper is more than the usual applications are called heavy copper PCB. Although there is no standard definition of heavy copper, it is generally recognized that if you use 3 ounces (OZ) or more copper on the interior and outer layer of the printing circuit board, it is called heavy copper PCB.

It is a multi-layered PCB, having an insulating layer and finally a copper layer. Increased thickness of copper in heavy copper PCB is mainly done to increase the electrical conductivity of PCB so that it can carry high currents. Copper is used as a material of conductivity due to its high thermal as well as electrical conductivity, it ensures that the heat is spread throughout the board making the high copper PCB more safer.

Is heavy copper PCB the same as high current PCB ?

Printed current boards are of various types, one of that is a high current PCB, which can withstand high temperatures and current situations. High current PCBs require a thicker and heavier copper layer to conduct a high amount of current because of which heavy copper PCB was introduced, these are a branch of high current PCBs.

These PCBs are very versatile because they are mechanically strong such as heavy copper PCB, as well as their electrical withstanding power is also high such as in thick copper PCBs, which enables them to remain durable for longer periods.

What is the copper thickness in PCB ?

What-Is-the-Copper-Thickness-In-PCBIt is the thickness of copper being used in the PCB. The standard unit to measure thickness in the PCB is Oz (ounces). It can be measured in inches, but this standard is usually not considered.

Copper is the conductive material coated over the PCB throughout the board. In standard PCBs, this layer has a thickness of 1Oz, although the thickness is much more than 1Oz in PCBs where the requirement of electrical conductivity is high such as high current PCB or heavy copper PCB.

If it is designed to carry more weight then, more layers of copper are added which increases the copper weight and also the cost of the PCB because copper is expensive.

What are the advantages of heavy copper PCB ?

What-Are-the-Advantages-of-Heavy-Copper-PCBA heavy copper PCB is considered to be a high current PCB due to increased thickness offering exceptional thermal and electrical conductivity features. Here are some of the benefits of a heavy copper PCB:
• Better thermal endurance as well as increased electrical conductivity.
• Smaller size of the circuit because copper thicker tracks are being used.
• They are reliable and cheap which makes them easily available to many electronics manufacturers.
• Mechanical strength is high thus stronger PCB.
• Simpler network of buses in heavy copper PCB as compared to others.
• Tight attachment also makes it affirmative to any kind of short circuit.
• Easy to repair when damaged, as only damaged part need to be repaired keeping the remaining PCB functional.
• Better application as heat sinks, especially where copper deposition is high.

FAQs about heavy copper PCB design ?

What is the future of heavy copper PCB design?

The electronic industry is steadily advancing, heavy copper PCB design will become more popular due to its increasing applications. It has evolved from time to time offering better thermal and electrical conductivity.

Heavy copper PCB and double or multilayer PCB

Heavy-copper-PCB-and-double-or-multilayer-PCBMost heavy copper PCBs are either double-layered or multi-layered meaning it has copper on the inside and outside of the board in double-layered PCB while there are more layers in between the inner and the outer layer in the multilayer PCB.

The number of layers in a PCB is based on the application of the PCB. Coming to its design it’s on each side there is a copper foil, and the middle layer is of copper again for better thermal and electrical conductivity.

What is heavy copper used for ?

We know cooper very well and know it is used in Printed circuit boards, but many of us are not familiar with heavy copper. It was introduced in the above that what is heavy copper PCB.

Heavy copper often refers to one that having layers of copper weighing more than 3 Ounces, which consists of more than 98% copper.Therefore, it is a lot heavier than its other copper counterparts and also used in many different fields.

The heavy copper PCB is used in different applications.
Some of them are:
• Military and airspace industry.
• A power converter in solar panels
• Communication devices
• Solar panel manufacturing
• Automobile industry
• Pumping plants
• To gain energy sources
• Battery system
• Weapon control system

How to choose the thickness of PCB copper?

How-To-Choose-the-Thickness-of-PCB-CopperRequirements for the usage of a certain PCB indicate the thickness of PCB copper. Different thicknesses are chosen depending on the expected current that is required to flow through the PCB. In the case of high-current PCB applications, the thickness of copper is usually kept high.

In some applications, a smaller amount of current is expected to flow, so there is no need for a high current capacity of PCB thus thickness is kept low. In High Current PCBs the copper thickness can go up to 3.0 oz/sq ft while in low current applications of the same PCB, the copper thickness of the PCB is kept low at 0.5 oz/sq ft or 1.0 oz/sq ft.

What is the difference between heavy copper PCB and thick copper PCB ?

These both are the same because it means that the copper layer is heavier or thicker than normal. Heavy copper PCB weights of up to 4 oz making it heavier than the generally used 1 oz copper thickness. Since both are the same so their uses and applications do not differ as well.

The additional copper added increases the current handling capabilities of the devices and results a smaller product as compared to the multiple layers of copper being used.


Heavy copper PCB have a high demand due to the conductivity of high current. The world is shifting to electronic devices at a rapid speed. We are using devices about which we had no idea about a decade ago. Sooner or later there is going to be a huge demand for high-current electronic devices which will, of course, make use of heavy copper PCB also they have a quality of quick dissipation of heat which adds to the advantages of this type of PCB.



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