In the modern electronic age, the miniaturization and thinning of electronic devices have led to rigidityPCBAnd flexibility/rigidPCBThe necessary appearance. So what type of substrate material is suitable for them? This article will reply.

Rigid printed circuit boards and flexible ones/The application fields of rigid printed circuit boards are constantly increasing, bringing new requirements in terms of quantity and performance. For example, polyimide films can be divided into various types such as transparent, white, black, and yellow, which have high heat resistance and low thermal expansion coefficient to be suitable for different situations. Similarly, polyester film substrates with high cost-effectiveness, such as high elasticity, dimensional stability, film surface quality, optoelectronic coupling, and environmental resistance, will also be accepted by the market to meet the diverse needs of users.

Compared to rigidityHDI PCBSimilarly, flexiblePCBIt is necessary to adapt to the requirements of high-speed and high-frequency signal transmission, and the dielectric constant and dielectric loss of flexible substrate materials must also be taken into account. Flexible circuits can be composed of polytetrafluoroethylene and advanced polyimide substrates. Inorganic dust and carbon fibers can be added to polyimide resin, resulting in the formation of a three-layer flexible thermal conductive substrate. Inorganic filling materials can be aluminum nitride, aluminum oxide, or hexagonal boron nitride. This substrate material has1.51W / mKHas thermal conductivity and can resist2.5kVThe voltage and180The curvature of degrees.

Flexible circuit boards are mainly used in fields such as smartphones, wearable devices, medical equipment, and robots, which requires new requirements for the structure of flexible circuit boards. So far, some new flexible materials have been developedPCBProducts such as ultra-thin flexible multilayer printed circuit boards have a thickness ranging from ordinary ones0.4mmReduce to0.2mmHigh speed transmission of flexible printed circuit boards can be achieved with lowDkandDfThe application of polyimide substrate material has reached5GbpsThe transmission speed. High power flexible printed circuit boards with a thickness exceeding100μmThe conductor is designed to meet the requirements of high-power and high current circuits. All these special flexible printed circuit boards naturally obtain unconventional substrate materials.