370HR with mixed PCB Manufacturers

When designing a four layer PCB circuit board, how to design the stack? Theoretically, there can be three schemes

Our common computer boards and cards are basically epoxy resin glass cloth based double-sided printed circuit boards. One side is the plug-in components, and the other side is the welding surface of the component feet. It can be seen that the welding points are very regular

The environment in an industrial workshop is different from that of ordinary places, especially in production and processing workshops. Summer temperatures are already high, and combined with the heat dissipation from the machines, temperatures in the workshop often reach over 60°C, and in some cases even reach 80°C. The HDI PCB in industrial control equipment are the "brains" of the equipment. If they are not heat-resistant enough, problems can easily arise. These include circuit aging, component loss, and even direct short circuits. If the equipment stops, the entire production line will be affected.

HDI in HDI Board is the abbreviation of High Density Interconnector. It is a kind of (technology) for producing printed circuit boards. It uses micro-blind and buried via technology for a circuit board with a relatively high line distribution density. HDI is a compact product designed for small-capacity users.

With the rapid development of electronic design and communication fields and the application of cloud computing, products have higher and higher requirements for data volume, and data transmission rates are getting faster and faster. At the same time, the performance of high-speed plates that carry data transmission is also required to be higher and higher.So what should be paid attention to when using high-speed plates?

Nowadays, the automobile industry is developing towards intelligence, networking and sharing. ADAS and automatic driving technology are also advancing rapidly