Heavy Copper PCB
Heavy copper PCBs feature 3oz+ copper thickness, designed for high-current and high-power applications. Excellent thermal dissipation and current-carrying capacity, widely used in power supplies, automotive electronics, and industrial control systems.
Specifications
Key Features
Applications
What Is a Heavy Copper PCB?
A heavy copper PCB is a printed circuit board built with copper weights of 3oz (105µm) or more on inner and outer layers, versus the 1-2oz used on standard boards. The extra copper lets a single board carry high current, survive repeated thermal cycling and act as its own heat sink. PCB168 manufactures heavy copper PCBs from 3oz up to 20oz on 1-16 layers, with board thickness from 0.8mm to 6.0mm.
Choosing Copper Weight: 3oz, 4oz, 6oz and Above
Copper weight drives current capacity and trace width. As a rule of thumb, 3oz suits moderate power rails, 4oz-6oz is the sweet spot for automotive and industrial power stages, and 8oz-20oz is reserved for welding gear, high-power inverters and busbar-style traces. Heavier copper needs wider spacing and etch compensation, so sharing your current, temperature-rise budget and layer count up front lets our engineers optimize the stackup.
Thermal Performance and Reliability
Because copper conducts heat far better than FR-4, thick copper planes spread hot spots and lower peak junction temperatures. Combined with high-Tg FR-4 (TG170/TG180) laminate, heavy copper boards resist delamination and plated-through-hole fatigue under high-current load, which is why they dominate power conversion, EV, and industrial control applications.
Ordering Heavy Copper PCBs from PCB168
As a China-based heavy copper PCB manufacturer, PCB168 supports online quoting from your Gerber files, with prototypes typically shipping in 3-5 working days. Available finishes include HASL, ENIG and OSP. Send your stackup and current requirements for a manufacturability review before you commit to production.
Frequently Asked Questions
What copper thickness can PCB168 produce for heavy copper PCBs?
PCB168 manufactures heavy copper PCBs from 3oz up to 20oz copper weight, on 1-16 layer boards with thickness from 0.8mm to 6.0mm.
What are heavy copper PCBs used for?
Heavy copper PCBs suit high-current and high-power applications such as power converters, automotive electronics, industrial control, welding equipment, UPS systems and solar inverters.
Why choose heavy copper instead of standard copper?
Thicker copper carries more current, dissipates heat better and improves mechanical strength, making it ideal where standard 1-2oz copper would overheat or fail.
Can PCB168 build 4oz and 6oz heavy copper PCBs?
Yes. 4oz and 6oz are among our most common heavy copper builds. A 4oz (140µm) inner layer typically needs ~0.35mm trace width per 10A at a 10°C rise, while 6oz (210µm) handles higher current in the same footprint. We also produce 8oz-20oz for extreme power designs.
Are you a heavy copper PCB manufacturer in China with online quoting?
PCB168 is a China-based heavy copper PCB manufacturer serving global customers. Upload your Gerber files for an online quote and lead time; prototypes typically ship in 3-5 working days.
What surface finishes and materials are available for heavy copper?
We offer HASL, ENIG and OSP finishes on FR-4 TG170/TG180 base material, with board thickness from 0.8mm to 6.0mm for 3oz-20oz copper builds.
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