Printed Circuit Board Components?

If you’ve ever wondered what those tiny green and black squares are on the back of your computer’s motherboard, you’re not alone. Those are called printed circuit board, or PCB, components, and they are integral to the proper functioning of your machine. In this blog post, we’ll take a closer look at PCB components, what they do, and how they’re made.

PCB Components

PCB Components are the basic building blocks of any printed circuit board. They include the following:

1. Dielectric material: This is the material that forms the body of the PCB and provides insulation between the conductive layers. It can be made from a variety of materials, including glass, plastic, and ceramic.

2. Conductive material: This is the material that forms the conductive pathways on the PCB. It can be made from a variety of materials, including copper, aluminium pcb, and gold.

3. Solder mask: This is a thin layer of material that covers the conductive pathways on the PCB and protects them from shorts and other damage.

4. Silkscreen: This is a printable layer that is used to identify the various components on the PCB.

5. Surface finish: This is the final coating that is applied to the PCB to protect it from corrosion and provide a smooth surface for components to be soldered to.

SMD Components

Surface-mount technology (SMT) is a method for producing electronic circuits in which the components are mounted or placed directly onto the surface of printed circuit boards (PCBs). SMT components are much smaller than through-hole components, and they can be mounted on both sides of a PCB. This allows for a much higher density of components on a PCB than through-hole mounting.

SMT components are placed on the PCB using a pick-and-place machine, and they are then soldered in place using a reflow oven. SMT soldering is a process in which the entire board is heated to a temperature that is above the melting point of the solder. This allows the solder to flow and form a strong connection between the component and the PCB.

The main advantage of SMT over through-hole mounting is that it allows for a much higher density of components on a PCB. SMT components are also much less likely to be damaged during handling and assembly.

Through Hole Components

A through-hole component is a type of electronic component that is attached to a printed circuit board (PCB) using leads that pass through the holes in the board. The leads are then soldered to pads on the surface of the PCB. Through-hole components are typically larger than surface-mount components, and they are less susceptible to damage from heat and vibration.


Connectors are used to physically connect two or more parts of an electronic circuit. They come in a variety of shapes and sizes, and are made from a variety of materials. The most common type of connector is the pin header, which consists of a row of metal pins that are inserted into a matching set of holes on a PCB. Other types of connectors include D-sub connectors, BNC connectors, and DIN connectors.


Switches are one of the most basic and essential components in electrical circuits. A switch allows or prevents the flow of electricity through a circuit by making or breaking the connection between two conductors. Switches are usually operated by hand, but can also be operated automatically by sensors or other devices.

There are many different types of switches, including toggle switches, push-button switches, rotary switches, and slide switches. Each type of switch has its own unique set of features and benefits. For example, toggle switches are typically used to turn on/off lights or other devices, while push-button switches are commonly used to control the flow of electricity in a circuit.

While switches are relatively simple devices, they play a critical role in the operation of electrical circuits. Without switches, it would be very difficult to control the flow of electricity in a circuit.


An LED is a light-emitting diode that emits light when an electric current is passed through it. LEDs are used in a variety of electronic devices, including TVs, computers, radios, and clocks. LEDs are becoming increasingly popular as a replacement for traditional incandescent light bulbs, as they are more energy-efficient and have a longer lifespan.


A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider. If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat. The measuring instrument called a potentiometer is essentially a voltage divider used for measuring electric potential (voltage); the component is an implementation of the same principle. Potentiometers are commonly used to control electrical devices such as volume controls on audio equipment.


A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to limit current flow, to adjust signal levels, bias active elements, and terminate transmission lines among other uses. High-power resistors that can dissipate many watts of electrical power as heat, may be used as part of motor controls, in power distribution systems, or as test loads for amplifiers. Fixed resistors have resistances that only change slightly with temperature, time or operating voltage. Variable resistors can be used to adjust circuit elements (such as a volume control or a light dimmer), or as sensing devices for heat, light, humidity, force, or chemical activity.


A capacitor is a device that stores electrical energy in an electric field. It is composed of two conductors separated by a dielectric (insulating material). The conductors can be either metal plates, or strips of metal foil separated by an insulating film. The dielectric can be a solid, liquid, or gel.

The amount of energy that a capacitor can store is determined by its capacitance, which is measured in Farads. The capacitance is determined by the size of the conductors and the dielectric constant of the material between them.

Capacitors are used in a variety of electronic devices, including radios, televisions, computers, and electric motors. They are also used in power supplies to filter out unwanted AC (alternating current) noise.


A trimpot is a type of variable resistor which is often used to calibrate electronic devices. It usually has three terminals, and the resistance between two of the terminals can be adjusted by turning a knob or screw on the third terminal. Trimpots are often used in audio equipment, where they can be used to adjust the volume, balance, or other parameters.