2-Layer PCBs
Compared to 4-layer PCBs, 2-layer PCBs are much easier to work with due to their simple design. While not as simple as 1-layer PCBs, they’re as straightforward as you can get without sacrificing the functionality of double-sided inputs. The reduced complexity leads to an equally reduced price tag, but this means there are fewer possibilities than with the 4-layer PCB. As a pro, though, there is no propagation delay with the signal.
4-Layer PCBs
4-layer PCBs have much greater surface area than a 2-layer PCB, increasing the possibilities. As a result, they can be great for more complex devices. Because of their complexity, the production cost will be higher and development will be a bit slower. They are also more likely to have propagation delays, so be sure to factor in extra production time to any project timeline.
What are the Layers Used For?
The most important layer in a PCB is the copper signal layer, which is what the PCBs are named after. While 2-layer PCBs have two signal layers, 4-layer PCBs have – you guessed it – four. These signal layers are used to connect to other electronic components in the device. In between those layers is the insulation layer or core, which is added in between the signal layers to give it structure. In 4-layer PCBs, here’s also the solder mask layer, which is applied on top of the signal layers. This prevents the copper traces from interfering with other metal components on the PCB. They also have a silkscreen layer which is used to add numbers to the different components, making them easier to understand.
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There is no doubt that 4 layers PCB is more expensive than 2 layers PCB because of complexity of design and higher sensitivity.
But more and more electronic engineers prefer to 4 layers PCBs due to the higher levels of signal integrity and reduced interference levels.
What is the budget?
If you take a suitable budget into consideration, it’s better to choose 2 layers PCB.
What is the maximum dimension of PCB can be?
There are more functionality into a smaller space for 4 layers PCB.
How quickly do you need your boards?
2 layers PCB has a fast lead time compared to 4 layers PCB.
Dear Ronin, Could u please let me know the durability? sincerely appreciate your reply.
If you need to have a good durability, choosing 4 layers PCB.