How much current can a heavy copper board carry?

It depends on copper cross-section, allowable temperature rise and cooling; send the current per net and we will size the copper and vias.

Can one board mix heavy and fine copper?

Yes. Mixed copper weights within a stack-up are standard practice for boards that carry both power and signals.

Do you offer thermal management alongside heavy copper?

Yes — copper coins, thermal via arrays and aluminium or copper core hybrids are all available.

— SOLUTIONS

Heavy Copper PCB Solutions

HyperPCB supplies heavy copper PCB solutions with inner layers to 12 oz and outer layers to 14 oz for power conversion, busbar replacement and motor drives, including mixed-weight builds and metal-core hybrids for thermal spreading.

— SPECIFICATIONS

Capability & tolerance chart

Heavy Copper PCB Solutions — standard vs advanced.
Parameter	Standard
Up to 100 A	4 – 6 oz copper
100 – 200 A	8 – 10 oz copper
200 – 400 A	10 – 20 oz copper, evaluated case by case
Above 400 A	Traditional busbar is usually the better answer — we will tell you when
Maximum Inner / Outer Copper	12 oz inner / 14 oz outer
Layer Count	Up to 20 layers on heavy copper builds
Thermal Options	Copper coin, thermal via arrays, aluminium and copper core hybrids

Replacing busbars and wiring

Heavy copper planes carry the current that would otherwise need busbars, cable lugs and the labour to fit them. The board becomes the power distribution, which removes assembly steps and the joints that come with them.

Design rules scale with copper weight

Thick copper etches with sloped sidewalls, so line and space limits grow with weight. Tell us the current per net and the temperature rise you can accept and we will return a geometry that is manufacturable at that weight.

— FAQ