FR-4-Applications-Specifications-Custom Design

Circuit Board Electronic Pcb

Applications

Specifications

When ordering a copper clad laminate board, the FR-4 thickness and the copper foil thickness must be specified separately.

In the USA, FR-4 thickness is specified in thou or inches, and common thicknesses range from 10 thou (0.010 in, 254 µm) to 3 inches (76 mm).

In the USA, copper foil thickness is specified in units of ounces per square foot (oz/ft²), commonly referred to simply as ounce. Common thicknesses are 1 oz/ft²(300 g/m²), 2 oz/ft² (600 g/m²), and 3 oz/ft² (900 g/m²). These work out to thicknesses of 34.1 µm (1.34 thou), 68.2 µm (2.68 thou), and 102.3 µm (4.02 thou), respectively. Some PCB manufacturers refer to 1 oz/ft² copper foil as having a thickness of 35 µm (may also be referred to as 35 μ, 35 micron, or 35 mic).

• 1/0 - denotes 1 oz/ft² copper one side, with no copper on the other side.

• 1/1 - denotes 1 oz/ft² copper on both sides.

• H/0 or H/H - denotes 0.5 oz/ft² copper on one or both sides, respectively.

• 2/0 or 2/2 - denotes 2 oz/ft² copper on one or both sides, respectively.