With miniaturized electronic products becoming ubiquitous, the need for small circuit boards is on the rise. Multilayer circuit boards are therefore the order of the day. A 4-layer PCB stackup is becoming increasingly common. Let us look at the 4-Layered PCB in detail.
As its name suggests, a 4-layered PCB comes with 4 layers, these include a top layer, a bottom layer & 2 inner layers.
Of these 4 layers, 2 are signal layers, one VCC & the other GND.
Typically, the inner layers are used as power & GND, while the outer layers are used for routing of signals as well as for component placement. With the inner layers used as power and GND planes you can be sure that EMI emissions will be less, and the quality of signal will be robust.
The 4-layered PCB offers several advantages, including but not limited to:
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There can be 3 ways in which these can be stacked up
It is important to note that the less the distance between the power and the ground layer, the less will be the impedance.
In this option, the power and the ground layer acts as a shield for the inner signal layers. However, on account of the distance between the power and ground layer, the plane impedance tends to increase.
While this stack-up is like the first one, here the key signal layer is the top layer.
4-Layer PCBs come with two types of Core & Prepreg thickness. The standard thickness is 1.6 mm (about 0.06 in) although 1.2 mm (about 0.05 in) is also commonly used.
We have already published article where you can check difference between PCB core and prepreg .
With a 1.6 mm (about 0.06 in) PCB, the core material is 1.2 mm (about 0.05 in) thick while the prepregs are 0.2 mm (about 0.01 in) each.
With 1.2 mm (about 0.05 in) thickness, there is a core material of 0.8mm (about 0.03 in), o.2 mm (about 0.01 in) of prepreg with coil and 0.2 mm (about 0.01 in) of prepreg with copper.
Broadly the steps involved in manufacturing are as below:
When it comes to the cost of a 4-layer PCB, there is not a standard cost as it depends on several factors. Some of these factors include:
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It is important to make the right choice of PCB contract manufacturer who will be able to understand your bespoke requirements and fabricate your board according to your needs.
Technotronix is equipped with industry best practices. As a professional manufacturer with 40 years of experience who ensure that you do not have to reinvent the wheel. Technotronix provides PCB assembly and PCB fabrication service. Besides that, the cost and the turnaround time are also optimized so you will get a competitive advantage.
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