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Which materials are used to make circuit substrates, wiring, and cables?

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electron hole: movement — materials science Movement of an electron hole in a crystal lattice.

In materials science, the selection of materials for electronic components is critical for performance, reliability, and signal integrity.

Circuit Substrates

Substrates serve as the foundational base for electronic components. Alumina (aluminum oxide) is the dominant ceramic material used due to its high resistivity, mechanical strength, and thermal stability. Other materials include:1
* Silicon: Often used as a substrate for integrated circuits.1
* Glass-ceramics: Developed for their low dielectric constants and ability to match the thermal expansion coefficients of conductive metals.1
* Specialized films: Multichip modules may utilize substrates integrated with thin films made of tantalum nitride, titanium, palladium, and plated gold.2

Wiring and Cables

Conductive materials are essential for linking components and transmitting electrical signals.
* Wiring: High-purity copper is the standard for electrical conductors due to its excellent conductivity. For microchip interconnections, very fine gold or copper wiring is used.32
* Cables: Copper is frequently used in cables, often protected by insulating materials such as paper, fabric, rubber, or plastic. To enhance durability and resistance to moisture, cables may be covered with lead or reinforced with hemp or metal armouring.3
* Internal Conductors: In multilayer packages, tungsten or molybdenum are used as metallization lines for internal conductor paths.1