Heavy Copper

Heavy Copper (thick copper board) is a special printed circuit board (PCB) used to carry large currents and high power. Its copper layer thickness is significantly higher than that of conventional PCBS. Usually, the outer copper thickness is between 2 and 20 ounces (oz) (about 70 to 700 microns), and the inner copper thickness can even be superimposed to a higher level.

Definition and Classification of copper thickness

Copper thickness range:

Outer copper thickness: 2-20oz (70-700μm)

Inner copper thickness: Can be superimposed to a higher level (such as 200oz)

Classification basis:

Even if the total Copper content is less than 3oz, if the thickness of a single layer of copper exceeds 4oz per square foot, it is still classified as a Heavy Copper PCB.

Core characteristics

High current carrying capacity: Supports large currents of over 100A, suitable for high-power devices.

Excellent heat dissipation performance: Direct heat conduction through the copper layer (such as welding the heat sink of the TO-220 package TO the copper surface) enhances thermal stability.

Resistance to thermal cycling and corrosion: It can operate stably for a long time in high-temperature (such as welding heat) and corrosive environments.

High electrical connection strength: Provides stronger electrical connection points to reduce signal interference.