The best material of thin PCB--BT FR4

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The best material of thin PCB--BT FR4

With the thinning, multilayering, and increase of substrate-mounted components, especially the development of semiconductor mounting technologies such as BGA. MCM, the substrate is required to have high Tg, high heat resistance and low thermal expansion rate, so as to improve the interconnection of the board. And installation reliability; at the same time, with the development of communication technology and the improvement of computing processing speed, the dielectric properties of substrates have also begun to attract people's attention, requiring them to have lower dielectric constant and lower dielectric loss to meet signal transmission Speed and efficiency.To get more news about BT PCB, you can visit pcbmake official website.

BT (Bismaleimide-triazine) resin-based copper clad laminate (hereinafter referred to as BT board) has high Tg, excellent dielectric properties, low thermal expansion and other properties, making it a popular high-density interconnect (HDD). It has been widely used in multilayer PCBs and packaging substrates.

"BT" is the chemical trade name of a resin produced by Japan's Mitsubishi Gas Chemical Company. The resin is synthesized from bismaleimide (Bismaleimid, referred to as BMI) and cyanate ester (abbreviated as CE) resin. . As early as 1972, Ling Gas Chemical Company began the research on BT resin. By 1977, BT board began to be used in chip packaging soil, and then they continued in-depth research. By the end of the 1990s, more than a dozen varieties had been developed. , Different products can be made to meet different needs, such as high-performance copper clad laminate, chip carrier board, high-frequency application copper clad laminate, BT resin for packaging, resin-coated copper foil, etc. The demand for this type of sheet in the market is growing day by day.According to the survey results of the sales of various domestic glass cloth-based sheets in 1999 by Japan's JPCA, the sales of BT resin-based sheets are second only to FR-4 boards. , Reaching 36 billion yen.

Because of the importance of BT resin substrate, it has been listed in some authoritative standards in the world, such as EC 249-2-1994 as "No.18" board, IPG4101-1997 as "30" board: MIL-S- 13949H is defined as "GMr board, and the product standard formulated by JIS for this type of product is JS C-6494-1994. my country's national standard GB/T 4721-1992 also defines it as BT" board.

At present, BT boards on the market are dominated by products of Mitsubishi Gas Chemical Company. Only in recent years have some CCL manufacturers launch their BT boards, such as ISOLA and Hitachi Chemical. In China, the industrial production of BT boards is currently blank. However, with the development of the electronics industry and many foreign electronics industry manufacturers investing and building factories in mainland China, the demand for high-performance copper clad laminates in the domestic market is increasing. At present, there are already Research institutes have begun research on BT resin. For example, the BT resin developed by Wuxi Chemical Industry Research Institute has reached a certain level in performance, and Guangdong Shengyi Technology Co., Ltd. has also begun research on this type of sheet.