Printed Circuit Board or PCB is a board where electronics components are mounted and connected electrically using conductive tracks, pads or through multiple layers. PCB also provides mechanical support to the electronic components. Electronic components are mounted on the PCB using the soldering. To know more about the soldering please read our article about soldering.
Most commonly used substrate in printed circuit boards is a glass fiber reinforced (fiberglass) epoxy resin with a copper foil bonded on to one or both sides. PCBs made from paper reinforced phenolic resin with a bonded copper foil are less expensive and are often used in household electrical devices.
The printed circuits are made of copper, which is either plated or etched away on the surface of the substrate to leave the pattern desired. The copper circuits are coated with a layer of tin-lead to prevent oxidation.
Most commonly used substrate in printed circuit boards is a glass fiber reinforced (fiberglass) epoxy resin with a copper foil bonded on to one or both sides. PCBs made from paper reinforced phenolic resin with a bonded copper foil are less expensive and are often used in household electrical devices.
The printed circuits are made of copper, which is either plated or etched away on the surface of the substrate to leave the pattern desired. The copper circuits are coated with a layer of tin-lead to prevent oxidation.
There are various types of PCBs as below:
- Single Sided PCBs
- Double Sided PCBs
- Multilayer PCBs
- Rigid PCBs
- Flex PCBs
- Rigid-Flex PCBs
Single Sided PCBs
This type of PCBs includes only one layer of base material or substrate. One end of the Substrate is coated generally with copper or in some cases with other conducting material. Then a solder mask is applied for protection and above it a silkscreen coat is applied on the top of it.
These types of PCBs are less expensive. However they are used less due to their intrinsic design limitation.
Double Sided PCBs
In this PCBs both side of board include metal conductive layer. You can connect circuit at one side of PCB to the circuit at other side of PCB.
Circuits are connected with each other by using through-hole or surface mount technology. In through hole technology components are connected via leads or small wires through the holes. Whereas in surface-mount technology many leads are soldered directly into the board.
Multilayer PCBs
Multilayer PCBs use additional layers beyond top and bottom layers. Since there are multiple layers designers have to make very thick and highly compound designs.
Rigid PCBs
Best example for these kind of PCBs is motherboard in the computer. In this kind of PCBs a solid,rigid substrate material is used. This material will avoid the twisting of the board.
Flex PCBs
Flexible plastic is used as a substrate in Flex Printed Circuit Boards. These kind of PCBs has advantages of taking any form over the inflexible PCBs. Hence anyone can save bulky wiring in the circuit which result in reduction of weight and space. Hence Flex PCBs are used in the designing of satellites.
Rigid-Flex PCBs
As the name suggests it is the combination of Rigid and Flex PCBs. In these kind of PCBs a rigid PCB is joined with the Flex PCB.
Circuits are connected with each other by using through-hole or surface mount technology. In through hole technology components are connected via leads or small wires through the holes. Whereas in surface-mount technology many leads are soldered directly into the board.
Multilayer PCBs
Multilayer PCBs use additional layers beyond top and bottom layers. Since there are multiple layers designers have to make very thick and highly compound designs.
Rigid PCBs
Best example for these kind of PCBs is motherboard in the computer. In this kind of PCBs a solid,rigid substrate material is used. This material will avoid the twisting of the board.
Flex PCBs
Flexible plastic is used as a substrate in Flex Printed Circuit Boards. These kind of PCBs has advantages of taking any form over the inflexible PCBs. Hence anyone can save bulky wiring in the circuit which result in reduction of weight and space. Hence Flex PCBs are used in the designing of satellites.
Rigid-Flex PCBs
As the name suggests it is the combination of Rigid and Flex PCBs. In these kind of PCBs a rigid PCB is joined with the Flex PCB.
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