What is PCB? Full Form, Types, Design, Applications


The full form of PCB is Printed Circuit Board. In modern electronics industries, the applications and uses of PCB are very much. Every electronic device, in fact, some electrical devices also have printed circuit boards as their internal parts. PCB holds the electrical or electronic components, connect them together, and provides physical support. In this article, we are going to know about the PCB from basics to advance. Also, we will know about the different types of PCB, their applications and their advantages.


What is PCB?


PCB is a thin board made up of different types of non-conductive substrate or laminated materials, fiberglasses, composite epoxy. PCB gives physical support to the electronic components by holding their base or terminals and also make electrical contacts between them by laminated conductive copper tracks and pads. So, the main function of a PCB or Printed Circuit Board is to connect electronic components in a simple way, holds them, reduce the complexity of a large electronic circuit. 


Different Types of PCB


PCB or Printed Circuit Boards are classified into different types according to the substrate, number of layers, applications, tracks, frequency etc. So, the different types of PCB are,
  1. Single-Sided  or Single Layer PCB
  2. Double-Sided or Double Layer PCB
  3. Multilayer PCB
  4. Rigid PCB
  5. Flexible PCB
  6. Rigid-Flex PCB
  7. High-Frequency PCB
  8. Aluminium Backed PCB




Single Layer PCB


Single-layer PCB is the most usable and common type. It has a single conductive layer on the substrate. This type of PCB board holds the electronic components on one side only. As it has a single layer, it is best for small circuits. Of course, the design cost of the single-layer PCB is very low than other types. 

Here, you can see the construction of a single-sided PCB below,

single sided or single layer pcb construction diagram



You can see here a single copper layer exists between the solder mask and the substrate.

Applications of Single Layer PCB


Single-layer PCBs are mostly used for basic and low-density circuit designs. 




Double Layer PCB


Double-layer PCB has two conductive copper layers. Here, the conductive layers exist on both sides of the board. Mainly two different technologies are used to place the electronic components in a double layer PCB - 1. Surface Mount Technology(SMT) and 2. Pin Through Hole(PTH) technology. 

SMT technology helps to hold and connect the SMD components on the surface of the board whereas PTH technology helps to hold the leaded components at the same side as the SMD components but connect to the opposite side conductive layer. I mean to say that, SMT and PTH, both components are placed on the same side of the board but they are connected on different sides.
Here, you can see the construction of a  double layer PCB.

double sided or double layer pcb construction diagram


Here, you can see two conductive layers exist on both sides of the substrate.

Double Layer PCB Advantage


The main advantage of the double-layer PCB is, large or complex circuits can be implemented with the double layer PCBs. 

Double Layer PCB Applications


Double layer PCBs are used in mobile circuit boards, compact electronic power supply circuits, regulator circuits, etc.




Multilayer PCB


Multilayer PCB has more than two conductive layers. If the PCB has three conductive layers then also it will be called a multilayer PCB. All the conductive layers are laminated and insulated from each other. Generally, the multilayer PCBs are designed and manufactured in a Sandwich fashion.
Here, you can see the construction of a multilayer PCB.

multilayer pcb construction diagram

You can see there are multiple conductive layers.

Application of Multilayer PCB


Multilayer PCBs are used for industrial electronic boards, medical boards, and other complex boards.


Rigid PCB Boards


According to the flexibility or folding feature, it is a type of PCB board. Rigid PCB boards are cannot be twisted or folded. They are made up of hard substrate materials. Rigid PCB boards come with all types means - single layer, double layer or multilayer. Generally, there are four different layers exists in a rigid PCB board such as - a substrate layer, a conductive copper layer, a solder mask layer, and a silkscreen layer.

Rigid PCB Applications


In most cases, rigid PCB boards are used such as computer boards, power supply boards, television boards, etc.


Flexible PCB Boards


Flexible PCB Boards are made up of flexible substrate materials such as polyamide, polyester film, etc. So, they can be twisted or folded without any damage to the circuit printed on the board. Flexible PCBs also come with a single layer, double layer or multilayer.

Flexible PCB Applications


Flexible Printed Circuit Boards are used in flexible solar panels, cameras, Organic Light Emitting Diode(OLED), robotics circuits, complex electronic circuits, etc.




Rigid-Flex PCB


Rigid-Flex PCB is the combination of Rigid PCB and Flexible PCB. It can be a part of a big circuit, where hardness and flexibility both are required. You may notice flexible printed circuit boards are mostly used to connect two or more rigid boards together. In these cases, flexible boards are carrying conductors only. On a mobile phone also, you can notice the camera is connected through a flexible board to the main rigid PCB board. 

Rigid-Flex PCB Application


Rigid-Flex PCB boards are used in mobile phones, laptops, industrial boards, medical testing devices, etc.


High-Frequency PCB


High frequency in electrical and electronic circuits causes electromagnetic interference(EMI), unwanted signals, heat, etc. So, the PCB used for the high-frequency circuits are designed and manufactured in a different way. Generally, the high-frequency PCBs are made up of FR4 grade glass materials, polyphenylene oxide(PPO) resin, etc. High-frequency PCBs are designed by considering these important factors such as good mechanical strength, Dielectric Loss, Thermal Expansion, Water Absorption, etc.


Aluminium Backed PCB


In, normal PCBs fibreglass is generally used as a substrate material but in the aluminium backed PCB, aluminium is used as a substrate. There are some important advantages for which, aluminium is used as a substrate such as aluminium has more durability than other materials, aluminium can dissipate heat very easily, it is recyclable. Aluminium Backed PCBs are used in some special applications and special electronic devices or circuits.


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What is PCB? Full Form, Types, Design, Applications What is PCB? Full Form, Types, Design, Applications Reviewed by Author on 8/25/2021 Rating: 5
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