Multilayer PCB with High Copper Thickness — Power, Performance & Precision

 In the modern electronics industry, the demand for high-performance and power-dense circuit designs continues to rise. From industrial control systems to automotive power modules, reliability under high current loads is critical — and this is where Multilayer PCBs with High Copper Thickness play a vital role.

These advanced boards combine the complexity of multilayer design with the strength of thick copper conductors, making them ideal for applications that require high current capacity, thermal stability, and superior mechanical durability.

🧩 What is a Multilayer PCB with High Copper Thickness?

A Multilayer PCB consists of three or more conductive copper layers laminated together using insulating dielectric materials. These layers are interconnected through plated through-holes (vias) or microvias, allowing dense routing in compact spaces.

When the copper thickness in each layer exceeds 2 oz/ft² (approximately 70 μm), the PCB is categorized as a high copper PCB or heavy copper PCB.

🏗 Typical Structure:

• Top and Bottom Layers: Used for component placement and routing.

• Inner Layers: Dedicated to power distribution and signal integrity.

• Dielectric Layers: Provide insulation and mechanical strength.

• Vias: Connect multiple layers to ensure efficient current flow.

This configuration enables the PCB to handle high current and dissipate heat efficiently, ensuring long-term reliability even under harsh conditions.

⚙️ Key Features of High Copper Multilayer PCBs

✅ High Current-Carrying Capacity
Thick copper traces allow more current to pass without overheating, ensuring stability for power circuits.

✅ Superior Heat Dissipation
The added copper thickness spreads heat across the board more efficiently, protecting components from thermal damage.

✅ Improved Mechanical Strength
Reinforced copper structure increases board rigidity and resistance to vibration, making it suitable for industrial and automotive environments.

✅ Compact Design with Multi-Layer Integration
By stacking multiple layers, complex circuits can be implemented within a small footprint — perfect for high-density power systems.

✅ Enhanced Reliability and Lifespan
Thick copper reduces the risk of conductor cracking, delamination, and short circuits, extending operational life.

⚡ Applications of Multilayer High Copper PCBs

These boards are essential for products where power, durability, and precision are non-negotiable.

🔹 1. Industrial Equipment

Used in:

• Motor controllers

• High-power converters

• Industrial robotics

• Power supply modules

Why? Because they can handle continuous high current and extreme environmental conditions.

🔹 2. Automotive Systems

Applied in:

• Electric vehicle (EV) chargers

• Battery management systems (BMS)

• Power distribution units (PDUs)

• LED headlights and infotainment systems

Why? High copper PCBs support efficient energy transfer and minimize heat buildup in confined automotive designs.

🔹 3. Renewable Energy & Power Electronics

Used in:

• Solar inverters

• Wind turbine controllers

• Energy storage systems

Why? Thick copper ensures better energy conversion efficiency and supports high current flow in renewable energy devices.

🔹 4. Consumer & Communication Devices

Though less common, high copper multilayer PCBs are used in premium-grade electronics such as high-performance amplifiers and telecom power systems.

🏭 Manufacturing Multilayer High Copper PCBs at SQPCB

At SQPCB.com, we specialize in producing precision-engineered Multilayer PCBs with various copper thickness options — from 1 oz to 6 oz and beyond — depending on your project’s electrical and thermal requirements.

🔧 Our Manufacturing Capabilities:

• Advanced LDI (Laser Direct Imaging) for high-accuracy patterning

• Automatic copper plating for uniform thickness and reliable vias

• Controlled impedance for high-speed and power circuits

• High-TG and FR4 substrates for thermal resistance

• Surface finishes: ENIG, HASL, OSP, immersion silver/tin

🛠 Quality Assurance:

• 100% electrical testing

• AOI and X-ray inspection for multilayer registration

• ISO, RoHS, and UL-certified production lines

Our engineering team ensures perfect layer alignment, stable copper thickness, and optimized stack-up designs for each customer’s application.

💰 Why Choose High Copper Multilayer PCBs?

Because they provide the best of both worlds — the compact routing capabilities of multilayer boards and the power-handling strength of thick copper.

Feature	Standard PCB	High Copper PCB
Current Capacity	Moderate	High
Heat Dissipation	Normal	Excellent
Durability	Average	Very High
Cost	Low	Moderate
Best Use	Low-power electronics	Power & industrial systems

Thus, while they may cost slightly more to manufacture, their long-term performance and reliability make them a superior investment for demanding applications.

🌍 Choose SQPCB — Your Trusted Multilayer PCB Partner

With years of expertise and cutting-edge facilities, SQPCB is a global supplier of high-performance multilayer PCBs for industrial, automotive, and renewable energy systems.

We focus on:
✅ Precision engineering
✅ Fast prototyping to mass production
✅ Custom stack-up design
✅ Competitive pricing

At SQPCB, we don’t just manufacture PCBs — we build the foundation for powerful, reliable electronic systems.

🚀 Conclusion

A Multilayer PCB with high copper thickness is the backbone of modern power electronics — delivering enhanced current handling, superior heat management, and mechanical stability.

Whether you’re developing EV systems, industrial control boards, or energy converters, choosing a high copper PCB ensures efficiency, durability, and safety.