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Heavy Copper PCB

A Heavy Copper PCB is a printed circuit board where the conductive layer (typically copper foil) is significantly thicker than that of standard PCBs. Standard PCBs typically have copper weights ranging from 0.5 oz/ft² (approx. 17.5 µm or 0.7 mil) to 2 oz/ft² (approx. 70 µm or 2.8 mil). Heavy Copper PCBs generally refer to boards with copper weights starting from 3 oz/ft² (approx. 105 µm) and above. Extreme or Ultra Heavy Copper PCBs may refer to weights of 10 oz/ft² (approx. 350 µm) or even higher (e.g., 20 oz/ft² or 700 µm). Manufacturing Heavy Copper PCBs requires specialized etching and plating processes, as standard methods struggle to handle the thick copper while maintaining precision for fine features.
The core value of Heavy Copper PCBs lies in their exceptional current-carrying capacity and thermal management capabilities, complemented by increased mechanical strength. This makes them the ideal choice for high-power, high-current, and high-reliability applications. Although they have higher manufacturing costs and more complex processes, the performance and reliability benefits they provide in applications dealing with extreme electrical or thermal loads are often indispensable.
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Description

Product Characteristics

 
 

Significantly Increased Copper Thickness

Range: Copper weight ≥ 3 oz/ft² (105 μm), with extreme heavy copper reaching 10~20 oz/ft² (350~700 μm) or higher.
Comparison: Far exceeds standard PCBs (typically 0.5~2 oz/ft²).

 

High Current-Carrying Capacity

Characteristics:
Reduced resistance via larger conductor cross-sections, minimizing \(I^2R\) losses.
Example: A 3 oz copper trace (1mm width) carries 15~20A vs. 3~5A for 1 oz.
Advantage: Critical for high-power systems (e.g., power converters, motor drives) without overheating.

 

Superior Thermal Management

Characteristics:
Copper's thermal conductivity (401 W/(m·K)) enables integrated heat spreading.
Dissipates heat through planes and plated through-holes (PTH), reducing hotspots by 30%~50%.
Advantage: Enhances reliability of power components (e.g., IGBTs) with fewer external heatsinks.

 

Enhanced Mechanical Robustness

Characteristics:
Reinforced via walls (plated copper up to 10× thicker) resist thermal cycling stress.
Supports heavy components (transformers, capacitors) with improved vibration resistance.
Advantage: Extends PCB lifespan in automotive/industrial applications.

 

Design Integration Capability

Characteristics:
Mixed copper weights: Combine fine traces (≤10 mil) and high-current copper zones (>100 mil) on one board.
3D copper structures: Plated copper pillars/embedded heatsinks for thermal/electrical optimization.
Advantage: Simplifies integration of power+control circuits (e.g., all-in-one power supply PCBs).

 

Specialized Manufacturing Processes

Key Techniques:
Differential etching: Laser ablation + chemical etching to control undercut (maintaining trace integrity).
Step plating: Multi-layer deposition for ultra-thick copper (>20 oz).
Challenge: Costs 30%~100% higher than standard PCBs, requiring advanced equipment.

 

Product Application Field

 

 

 

Power Conversion Systems

Power Supplies:
- High-density server PSUs (>1000W), industrial AC/DC converters
- UPS power buses & inverter modules
Edge: Handles 200A+ current with <3% voltage drop, 40% better heat dissipation

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Renewable Energy & Storage

Solar/Wind:
- PV inverter MPPT circuits (withstands 600–1500V DC input)
- Wind turbine converter modules
EV Systems:
- On-board chargers (OBC), BMS master boards
- Traction inverters for e-drives (300–800V systems)
Edge: Stable operation at 105℃+, extends product lifespan

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Industrial Automation

Motor Control:
- Servo drives for industrial robots, VFD power stages
- High-current controllers for injection molding/ machine tools
Welding Equipment:
- Arc welder power modules (500A pulse current)
Edge: Resists vibration, reduces thermal failures by 30%

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Transportation & Aerospace

Rail Transit:
- High-speed train traction converters, auxiliary power units
Aerospace:
- Aircraft engine control systems, radar power supplies
- Satellite power distribution units (PDU)
Edge: Complies with MIL-STD-810G shock standards, operates at -55℃~125℃

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Medical & Defense

Medical Devices:
- MRI gradient amplifiers, X-ray generator HV circuits
Defense Equipment:
- Military vehicle e-drives, naval radar power systems
- High-energy laser weapon power modules
Edge: Ultra-high reliability (MTBF > 100k hours), EMI shielding

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