- PCB Manufacturer & PCBA Service Provider You Can Count On.
- +86-755-27347385
- info@mktpcb.com
A printed circuit board (PCB) mechanically supports and electrically connects components with conductive tracks, pads, and other features etched from sheet layers of copper laminates. These layers define the overall functioning of the PCB. Therefore, it is a grave mistake to design a PCB without considering the PCB layers.
Imagine constructing a house from the roof! How does it sound? Weird, of course. Usually, building a home starts from the foundation up, which calls for a well-structured building plan. A professional construction engineer focuses on the foundation first. Later on, the builder focuses on the walls, doors, windows, ceiling, and other things.
The same principle applies to a PCB design. A PCB requires a firm and clear designing principle, and the layers act as the foundation of the design. This guide will teach you everything about PCB layers. Welcome, and let’s enrich our PCB knowledge.
A PCB layer is made up of signal transmitting levels that are vertical to the board’s plane. For instance, a 2-layer board has top and bottom layers while a 4-layered PCB has a top, inner 1, inner 2, and bottom layer.
There is an insulating substrate in the middle of every PCB layer – the FR4 (Fire Retardant Version4). This substrate is an epoxy saturated fiberglass with Teflon-based material. Generally, standard PCBs contain solder masks on the surface copper layers. Sometimes, the mask is present in both the upper and lower layers. These masks get applied as a liquid or sheet onto the board layers.
Dielectric materials play two essential roles in PCBs:
The role of copper in a printed circuit board is indisputable. Every designer acknowledges it as a good conductor of electricity, but it plays other important functions. For example, it affects the PCB’s capacity to receive the proper current flow and influences power loss.
The quality of copper in a board determines the impedance and thermal conductivity of a ground plane. Besides, you can strengthen your PCB stability by merging the copper’s length and thickness. The quality of copper also affects the PCB’s integrity.
Dimension lines and markings play an essential role in a printed circuit board. Their primary function is to define the dimension and mechanical layers of aboard. Secondly, they offer the board foundational measurements. The assembly information is useful in location regulation and component placement.