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3 Oz Copper PCB

Jarnistech > Heavy Copper PCB > 3 Oz Copper PCB
3 Oz Copper PCB

If you are considering enhancing the current carrying capacity of PCBs in your appliances or seeking a PCB that can efficiently handle high heat transfer, a 3 oz copper PCB could be an excellent choice. To provide clarity on this topic, the following guide presents a compilation of pertinent questions that will address any queries you may have about 3 oz thick copper PCB. Let’s delve into the information below without delay.

What is 3 0Z Copper PCB?

A 3 oz copper PCB refers to a specific type of circuit board where the copper layers have a weight of approximately 3 oz. There is a meticulous configuration of these copper layers, endeavoring to materialize a PCB maintaining a copper weight of merely 3 oz. It is meritorious to remark that an assortment of PCB types with diverse copper weights is accessible in the market.

The design of the circuit board is influenced by the prescribed spacing of the copper around the PCB, which determines the specific layout of the board. In 3 oz copper circuits for PCBs, the least copper thickness is ordinarily in the around of 3.0 mm. Subsequently, the final copper thickness in these PCB also culminates at 3 oz.

In the realm of 3 oz PCB circuitry, the solder mask conventionally bears a white hue and denotes the partition amidst the copper strata. The extent of copper thickness in the PCB emerges as a crucial determinant of not only the thermal transference but also the board’s current bearing As the copper thickness increases, so does the thermal and current conductivity of the PCB.

Therefore, increasing the copper thickness in PCB circuits leads to improved thermal conductivity and higher current carrying capacity.

Main Features of 3 0Z Copper PCB

Reinforcing Material: The PCB is constructed using a combination of glass fiber and wood pulp as the reinforcing material. Complementing this, it boasts a copper cladding on both flip sides of the board, contributing to a superior conductive performance.

Heat Dissipation: The PCB is designed to enhance heat dissipation throughout the circuit board, ensuring even distribution of heat and forestalling potential impairments elicited by uneven thermal conditions.

International Standards: The materials used in the PCB adhere to established guidelines and international standards, ensuring compliance, quality, and compatibility with industry requirements.

Conductor: The PCB exhibits exceptional properties as both an electrical conductor and a heat conductor, enabling efficient transmission of electrical signals and effective heat transfer.

Benefits of 3 Oz Copper PCB

3 oz copper PCB offer some benefits:

●Increased Current Carrying Capacity
●Reduced Power Loss
●Enhanced Thermal Management
●Improved Signal Integrity
●Higher Reliability
●Superior EMI/RFI Shielding
●Fine Trace and Space Capabilities

Applications Suited for 3 oz Copper PCB

PCB crafted with 3 oz copper are ideally compatible with a plethora of applications necessitating high current carrying capacity, efficient heat dissipation and credible performance. Several familiar applications where you would commonly find the utilization of these 3 oz copper PCB encompass:

Power Electronics:

3 oz copper PCB are ideal for power electronic devices such as inverters, motor drives, power supplies, and electric vehicle charging systems. They can handle high current levels without significant power loss, ensuring efficient power delivery while minimizing overheating risks.
Industrial Equipment:

3 oz copper PCB are used in industrial equipment like robotics, automation systems, and heavy machinery controls. These applications often have demanding power requirements and benefit from the higher current-carrying capacity of 3 oz copper PCB.

LED Lighting:

LED lighting fixtures require efficient heat dissipation to maintain optimal performance and prolong LED lifespan. 3 oz copper PCB can effectively dissipate heat, making them suitable for high-power LED applications, including street lighting, commercial lighting, and stadium lighting.

Renewable Energy Systems:

Solar inverters, wind power converters, and other renewable energy systems necessitate PCB capable of handling high currents and efficiently managing heat. 3 oz copper PCB are well-suited for these applications due to their robust current-carrying capacity and thermal management capabilities.

Automotive Electronics:

Modern vehicles increasingly rely on advanced electronics and power-hungry components. 3 oz copper PCB are employed in automotive applications like engine control units (ECUs), lighting systems, electric vehicle battery management systems, and high-power audio systems.

Aerospace and Defense:

The aerospace and defense sectors require PCB that can endure harsh operating conditions, maintain stability, and handle high currents. 3 oz copper PCB find application in avionics, satellite communication systems, military radar systems, and other electronic components for aerospace and defense applications.


Telecom infrastructure such as base stations, routers, and communication modules benefit from the reliable performance and high current capacity of 3 oz copper PCB, ensuring efficient data transmission and signal integrity.

What Materials Used in 3 Oz Copper PCB Manufacturing?

In the production process of the 3 oz copper PCB, producers utilize an array of materials, tin alloy being one such materials, contributing to the overall thickness of the heavy copper PCB. Additionally, the 3 oz copper PCB incorporates other conductive materials to enhance its functionality.

Steel wood is prevalently incorporated into PCB circuits to confer strength and steadfastness to the board. In the manufacturing process of heavy copper boards, carbon steel is a frequently used material. It is usually sheathed with resin to bolster its durability and functionality.

Prepreg is an essential component incorporated into 3 oz PCB to ensure the circuit can withstand extended temperature ranges. FR-4 materials are widely utilized for fabricating 3 oz PCB, comprising epoxy reinforced fiberglass. FR-4 exhibits poor electrical conductivity, making it an effective insulator. Furthermore, FR-4 is lightweight while maintaining a rigid mechanical structure.

Key Factors to Consider When Selecting Materials for 3 oz Copper PCB

When selecting materials for 3 oz copper boards, it is crucial to consider the following:

●Thermal Conductivity
Impedance Control
●Material Thickness
●Dk (Dielectric Constant) of the Material

By carefully considering these factors during material selection, manufacturers can create reliable and high-performance 3 oz copper PCB.

Design Considerations for 3 oz PCB Fabrication

Determining the thickness of the copper conductor trace is a crucial task for manufacturers prior to designing a 3 oz copper PCB. In the fabrication of such PCB, there are several important design considerations to keep in mind:

Trace spacing:

It is essential to recognize that heavier copper PCB require increased spacing. For 3 oz metal copper boards, a minimum spacing of 10 mils is recommended. The spacing between traces is determined by considerations of creepage and clearance, which are vital for minimizing the risk of flashover.

Connection points:

It’s important to use markings to show where electronic parts are placed on the circuit board. This helps in applying the masking techniques during the production process.

Trace width:

The width of the conductive trace on the board surface, known as trace width, is critical for establishing connections with components. Trace width is a determining factor of the current-bearing capability of the conductor route, establishing it as an indispensable attribute to contemplate in the design process.

Hole Placement:

The strategic placement of drilled holes is a key design consideration. Accurate hole placement is imperative to avoid interfering with the overall board design. Any misplacement of holes can result in financial costs and other manufacturing complications.

Overall, when designing a 3 oz copper PCB, manufacturers need to carefully consider trace spacing, connection points, trace width, and hole placement. Complying with these design considerations guarantees the assembly of a superior PCB that fulfills the demanded electrical and functional stipulations while diminishing the risk of complications throughout the manufacturing phase.

Comparison of 3 oz to Standard 1 oz Copper

Parameter1 oz Copper3 oz Copper
Copper Thickness1 oz/ft2 (35 μm)3 oz/ft2 (105 μm)
Trace ResistanceHigher~65% lower
Current CapacityLower~2.5x higher
InductanceHigher~2x lower
Thermal ConductionModerateImproved
EMI ShieldingFairExcellent attenuation
Fine Line Capability3-4 mil lines/spaces2-3 mil lines/spaces
CostLowerModerately higher

In high-power, high-frequency, or mission-critical applications, utilizing 3 oz copper instead of the standard 1 oz foil yields significant performance enhancements. The increased copper thickness offers substantial improvements, making it the preferred choice for demanding applications.

How Thick is 3 oz Copper PCB?

The thickness of a 3 oz copper PCB is typically estimated to be up to 10 mil or 0.254mm, which is equivalent to 105 microns. This substantial thickness gives the PCB its “Heavy Copper PCB” designation. To create a multi-layer PCB, the heavy copper PCB is integrated with PCBs of different thickness levels.

During the manufacturing process, a high-quality solder mask is carefully applied to align the copper layers, achieving the desired thickness level for the PCB circuit board. Manufacturers like JarnisTech offer services to produce PCB circuit boards with various thickness levels to meet specific requirements.

To avail of such services, simply visit their website and inquire about the desired thickness level for the copper PCB circuit boards. They will provide you with high-quality PCB circuit boards to meet your needs.

How to Measure the Weight of 3 0Z Copper PCB?

The weight specifications of a 3 oz copper PCB are ascertained by gauging the thickness of the copper strata integrated within the PCB. Generally, the weight of such a PCB is evaluated in ounces per square foot. Conversely, the minimal copper-clad area on the PCB can also serve as a viable metric for estimating its weight.

The weight of a copper PCB is directly linked to how much copper’s. The more copper layers the PCB has the heavier it will be. You can determine the thickness of a copper PCB by looking at it when rolled up unless it covers one foot of space.

Moreover, the weight of a 3 oz copper PCB is driven by various determinants, encompassing the assembly of connectors integrated on the board, the interplay of components within the PCB circuit, and control of impedance.

These factors collectively contribute to the overall weight of the thick copper PCB.

How to Choose the Best 3 oz Copper PCB Manufacturer?

Choosing the most suitable 3 oz copper PCB manufacturer requires careful contemplation of various determinants to ensure the attainment of superior products and steadfast services. Here are essential elements to evaluate:

Quality and Standards: Aim for a manufacturer who is committed to high-quality benchmarks. Investigate their compliance with conventional industry manufacturing protocols, their conformity with international quality certifications such as ISO 9001, and a solid track record of providing trustworthy products.

Experience and Expertise: Gauge the manufacturer’s history in the fabrication of 3 oz copper PCB. A manufacturer with significant experience is more likely to possess the technical know-how, state-of-the-art machinery, and proficient workforce to cater to your distinct demands.

Capability and Capacity: Evaluate the manufacturer’s capabilities and capacity to handle your project. Consider factors such as production volume, lead time, PCB layer count, and the ability to meet your customization needs. Make sure they have the necessary infrastructure and resources to fulfill your orders efficiently.

Pricing and Cost-effectiveness: Although price shouldn’t serve as the exclusive determinant, it’s crucial to assess the manufacturer’s pricing plan to ascertain its compatibility with your financial planning. Procure estimations from various manufacturers and contemplate their price points in harmony with the quality of their goods and services.

Customer Support and Communication: A trustworthy manufacturer should deliver top-notch customer assistance and exhibit agility in addressing your queries and worries. Seek transparency and fluidity in communication routes, speed response intervals, along with a dedication to comprehending and fulfilling your distinct requisites.

Additional Services: Consider any additional value-added services offered by the manufacturer, such as design assistance, prototyping, PCB assembly and testing. These services can streamline your PCB development process and reduce the need for multiple suppliers.

By judiciously evaluating these elements, you are empowered to make a knowledgeable selection and opt for a 3 oz copper PCB manufacturer that best fits your unique requirements, guaranteeing superior products, efficient delivery and dependable support.


Tripling the thickness of conventional 1 oz foils, 3 oz copper delivers a prominent uplift in current capacity. It permits more delicate features, diminishes losses, optimizes thermal management, strengthens reliability, and affords excellent EMI control. These merits solidify 3 oz copper’s standing as the preferred material for sophisticated, high-performing, and highly reliable electronic devices.

To fully leverage the capabilities of 3 oz copper, engineers must employ disciplined layout and design practices tailored to the finer geometries and higher densities achievable. By adhering to proper design principles, 3 oz copper PCB technology empowers electronics to meet present demands and future requirements.

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