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Why 9oz PCB is Best for You

The importance of the thickness of copper on board cannot be overemphasized. This is because it plays a huge role in improving the device’s reliability and power density. The 9oz Copper PCB simply has a lot to offer in this regard

In this guide, we are going to touch various aspects of the 9oz PCB. Please continue reading, as we treat this topic systematically, and give answers to questions regarding this copper PCB.

What is a 9oz PCB?

9oz PCBs feature boards with thick copper and the total weight of the copper is 9 ounces. The thickness that results for the 9oz copper is 0.0126 inches or 12.6 mils.

This copper PCB plays a vital role, as it can carry current values that are large. Consequently, the thermal energy dissipated will be huge as well. Let’s go on to know the benefits of 9oz PCB.

Benefits of the 9oz PCB

Below are some of the benefits of 9oz PCB

  • With 9oz PCB, you are sure to prolong the product’s service life
  • It reduces the equipment’s operating temperature
  • It ensures that the circuit’s design has the right heat diffusion
  • Help in improving the device’s reliability and power density

Qualities of 9oz PCB

Below are some of the qualities of the 9oz PCB.

Conduction of large currents

Without any impairing performance, the 9oz copper printed circuit board, has all it takes to carry large amounts of current. This ability to carry current has to do with the board’s thickness. A thick layer for your copper helps in increasing the area of the path of current.

Endurance of Thermal Strains

9 oz copper can endure any thermal strain that results from the construction of large current. There is a direct relationship between the thermal power, which has been dissipated in heat energy form and the current conducted.


The 9oz copper PCB is useful in environments that have boards with lower thickness value which are not useful. Environments having high temperatures may cause problems for the standard thickness of copper PCBs. This is why 9oz copper is useful because it has great thermal management.

Things to Consider when Designing 9Oz PCB

The process of designing your 9Oz PCB entails proper attention to its present demands and the nature of the application.

You will discover that this PCB’s current-carrying capacity has to do with an increase in heat dissipation. Due to this reason, there are some considerations for thermal management. Below are some of the elements for designing the 9Oz PCB.

  • The amount of current to be carried
  • Spacing of the components
  • The 9 Oz copper PCB’s configuration
  • The density of the board, which influences the size of the board
  • Width, length, and spacing of the trace
  • Component type
  • The heat dissipation mode

Can you Make a 9Oz PCB with Multiple Layers?

It is possible to find the 9Oz PCB as multilayer boards. If you are new to this, multilayer boards refers to boards having many layers. The use of many layers provides a lesser board size and an increase in density.

 Furthermore, it is possible to make the count of the layers to suit the needs of the application. You can make your 9oz copper PCBs to have a count of over eighteen layers.

Also, you can see copper foils having 0.5 ounce as well as 1oz copper thickness utilized in this construction. Note that, whenever you are creating multilayer boards, you should use through-holes. This will help in providing interlayer connectivity.

The Significance of Glass Transition Temperature in a 9Oz Copper PCB

Laminates are utilized in holding the layers together, anytime you are making a multilayer 9oz PCB. Usually, laminates are made up of a fiberglass material that is reinforced with resin or epoxy.

When dealing with these laminates, one important parameter is the glass transition temperature. This temperature refers to that temperature where material having glass properties changes form to the viscous state.

Laminates in 9oz PCB, usually have a glass transition temperature that is high. 9oz copper PCB usually carries large amounts of current. This follows that the heat energy that is dissipated will be large as well.

Laminates having a glass transition temperature that is low will have to succumb to this thermal dissipation. This changes from a leading structure to a weak one.

How do you Attach Chips directly to the 9Oz Copper PCB?

Attaching the chip onto the board offers communication paths and electrical conductivity between the chip and system board. You can achieve this by using flip chipping, automated binding using tape, and wire bonding.

Wire bonding

Wire bonding is well-known as the more prominent and earliest methods. Here, the chip features wired leads, which are attached to the board’s drilled holes.

Inspecting this technique for attachment is easy and you can also replace the chips with ease.

Automated bonding

With automated bonding, you will be able to test the components before you attach them. This method is common when utilized with components having low profiles.

Flip Chipping

This technique is an attachment type, which offers an electrical connection that is more reliable.

Reasons why FR-4 is commonly used as Prepreg for 9Oz PCB

FR-4 is useful for binding the layers of 9Oz copper pcbs. This is because it comes with some special features. These include:

High Compatibility: FR-4 can serve many different types of material, which includes inorganic fillers

Low Cost: FR-4 comes at a low cost. This is due to its ease in production with already-existing technology.

Wide Application: FR-4 can serve many other industries. This is one reason why it readily available

Restrictive Use of Lead: Because the use of lead has been restricted because it os hazardous, the FR-4 can serve as a good option during assembly processes without lead.

Great material: The FR-4 material features great performance stability

Control certain properties: Using FR-4 coupled with other materials allows you to control some properties like dielectric and thickness of the board. Furthermore, you will be able to tailor the prepreg with the application’s demands.

Great mechanical, electrical, and thermal properties: FR-4 offers great mechanical properties, which ensures the board has great mechanical strength. Also, it gives great electrical and thermal properties.


9oz copper PCB comes with great features. You are making a good decision, working with one. If you have any questions, contact us; we will always be here to help you.