Most often, the foundation, or base, of a printed circuit board (PCB) consists of a substrate and laminate. Different substrate and laminate materials determine how the PCB will perform. So, selecting the right types of PCB material for the intended purposes is critical to achieving the best possible:To get more news about fr4 board, you can visit pcbmake official website.
Those qualities should be part of any PCB design guide, and they’re the qualities we’ll keep in mind as we discuss below.
The material you use for your PCB can affect short- and long-term performance, as well as the ability of your contractor to manufacture it. It's just like anything else -- you get what you pay for. When you buy bad materials and they fail when your contractor tries to manufacture the board, you can’t blame it on the contractor.
So, what to use? Materials commonly used in PCB substrates range from FR-1 and G-10 to PTFE, alumina and Kapton. Laminates are formulated from CTE, PTFE, CEM, and a variety of other compounds.When high performance is not an essential PCB characteristic, a material like lightweight polyester is probably a good choice. There are at least two reasons to select lightweight polyester under these circumstances, as long as it’s used in conjunction with printed electronics (PE) technology.
However, traditional PCBs are still the first choice for high-performance applications, and the decision about which materials to use in their creation should be based on the kind of board required. For example, will the board:
Temperature and a substrate or laminate’s ability to handle it is of particular importance for PCBs. High heat can render a board useless, so heat resistance has to be higher than heat generatedTg, or vitrification temperature, is the point at which a PCB goes soft and loses its ability to perform well.
For high-performance boards, the Tg is usually higher than 170˚C. Standard PCBs have a Tg of 130˚C. A high Tg also indicates a greater ability to resist chemicals and moisture.Also, it’s important to specify the Tg to match the assembly process being used. A Tg with a minimum of 170˚C is recommended for lead-free assembly.
Some electronics contract manufacturers will fill in the blanks when you’re vague on your specifications. For example, we’ve had customers say, “We want a RoHS-compliant PCB,” but don’t provide the Tg specs. In cases like that, some electronics manufacturers will figure out the specs for the customer.