Heavy Copper

Heavy Cu does not have a set definition per IPC. We generally define Heavy Copper PCB as the use of 3heavy-cu-min-spacing ounce copper or higher in inner and/or outer layers of a printed circuit or power distribution board. Saturn is UL-Certified for up to 6-oz copper on inner and outer layers and capable of double-sided and multilayers up to 20 oz. Increasing the thickness of the copper trace as opposed to its width allows for higher-current carrying capacity as well as a higher density and a lower layer count. Moreover, its ability to conduct heat allows for thermal distribution and heat dissipation for large power components.

Applications Fabrication issues
1.  High-power heat dissipation 1.  Delamination / resin voiding
2.  Planar transformers 2.  Inner layer alignment
3.  Power convertors 3.  Fabrication concerns with thinner materials
4.  Electric vehicle (EV) and photovoltaics (PV) 4.  Over-etching (anti-puddling)
5.  BMS (Flexible Heavy Cu) 5.  Etch factor / compensation
6.  High-voltage Click here for more

Heavy Cu Resource Centercta-heavy-cu-resource-center
Click here for our latest Resource Center featuring information on materials, methods, articles, calculators and DFM rules.

Sample Boards

20 oz Cu PTH Power Supply
Mouse over pictures below to see description


Click here for additional Heavy Copper sample boards from our sister company Saturn Flex.

About Us

Domestic PCB Fabricator

Bare printed circuit board manufacturer (NAICS: 334412)
Romulus, MI (since 1985)
(734) 941-8100

BREAKING: DPA for PCBs: Defense Production Act prioritizes domestic circuit boards.

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