Copper Invar Copper PCBs
Copper Invar Copper PCBs was introduced into the printed circuit board industry to combat the differing coefficient of thermal expansion encountered when bonding very dissimilar materials together. Here at PW Circuits we have extensive knowledge of this and many other types of printed circuit board.
Copper invar copper (CIC) is a special type of printed circuit board (PCB) designed for situations where maintaining consistent size and shape is crucial. It achieves this by incorporating a layer of Invar, a nickel-iron alloy known for its minimal expansion and contraction with temperature changes. This Invar core sits sandwiched between two copper layers, offering superior dimensional stability compared to traditional PCBs. This makes CIC boards ideal for high-precision electronics applications, particularly in aerospace or environments with large temperature swings. Additionally, the copper layers provide excellent electrical conductivity for efficient current flow.
Invar, also known generically as FeNi36, is a nickel–iron alloy notable for its uniquely low coefficient of thermal expansion. The name Invar comes from the word invariable, referring to its relative lack of expansion or contraction with temperature changes.
Copper Invar Copper is a layer of invar which is a nickel situated in-between two layers of copper foil. From this stack up we can create your specialised printed circuit board.
Copper Invar Copper is readily available in the two thicknesses shown below:
| Total Thickness | Copper | Invar | Copper |
|---|---|---|---|
| 0.152mm (0.06″) | 0.019mm | 0.113mm | 0.019mm |
| 0.254mm (0.10″) | 0.051mm | 0.152mm | 0.051mm |
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