Thick Copper PCB Guide

Thick copper PCB refers to a printed circuit board with a copper foil thickness greater than 3 ounces (3oz). 1 ounce is approximately equal to 35 microns. This special PCB design can meet the needs of high current and high power.
Compared with standard PCBs, thick copper PCBs can carry higher currents.
  1. 3oz copper foil can carry a current of about 12A
  2. 6oz copper foil can carry a current of about 20A
  3. 10oz and above can carry a higher current
Thick_Copper_PCB

Technical Specifications Table for Thick Copper PCB

Parameter Category Technical Parameter Specification Range
Copper Thickness Standard Thickness 3oz-20oz (105μm-700μm)
Inner Layer 1oz-12oz (35μm-420μm)
Outer Layer 3oz-20oz (105μm-700μm)
Board Parameters Material Type FR-4, High Tg Material (Tg 150-180℃)
Board Thickness 0.4mm-5.0mm
Layer Count 1-16 layers
Design Parameters Minimum Line Width 3oz: 8mil
6oz: 12mil
10oz: 16mil
Minimum Spacing 3oz: 8mil
6oz: 12mil
10oz: 16mil
Minimum Hole Size 0.3mm (finished hole)
Board Dimensions Max 650mm × 550mm
Surface Finish Available Options HASL(Lead-free)
ENIG
OSP
Immersion Gold
Immersion Tin
Electrical Properties Withstanding Voltage ≥3000V
Insulation Resistance ≥10^4 MΩ
Maximum Current Density 35A/mm²
Reliability Indicators Soldering Heat Resistance 288℃, 10s
Peel Strength ≥1.4N/mm
Temperature Resistance -65℃ ~ +125℃
Via Reliability Meet IPC Standards
Special Requirements Impedance Control ±10%
Bending Performance Meet IPC-6012 Standard
Board Flatness ≤0.7%

Notes:

  1. Parameters may be adjusted according to customer requirements
  2. Special specifications need advance confirmation
  3. All parameters comply with IPC standards
  4. Customized solutions available

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Advantages of Thick Copper PCB

Advantages_of_Thick_Copper_PCB
  1. High Current Capacity
  • Handles larger current loads
  • Suitable for high-power applications
  • Reduces circuit overheating risks
  1. Superior Heat Dissipation
  • Better thermal conductivity
  • Efficient heat spreading
  • Lower operating temperature

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Applications of Thick Copper PCB

Power_Supplies pcb

Power Supplies

Thick Copper PCBs are used in power supplies for their ability to handle high currents and dissipate heat efficiently.

Automotive_Electronics pcb

Electric Vehicle (EV) Charging Stations

  • High current handling capability
  • Reliable power distribution
  • Enhanced safety features
Industrial_Controls pcb

Industrial Power Supplies

  • Stable power output
  • Excellent heat dissipation
  • Heavy-duty performance
Renewable_Energy_Systems pcb

Solar Power Inverters

  • High power conversion efficiency
  • Thermal stability
  • Weather-resistant design
Aerospace_Applications pcb

Aerospace Applications

  • High reliability power distribution
  • Radiation-resistant design
  • Thermal cycling tolerance
Telecommunications pcb

Telecommunications

  • High-frequency signal handling
  • Power amplification modules
  • Thermal management systems

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