The Key Difference Between PCB And PCBA: What You Need To Know

Modern-day smartphones are doing wonders with the developed camera, higher refreshing rate, and hardware improvement. Similarly, contemporary warfare has seen tremendous use of drone helicopters to spy on enemies.

All these have been made possible because of the advancement of PCB and PCBA. These two technologies have changed the communication, electronics, military, medical device, etc. industries dramatically.

Yet we found that many people consider the PCB and PCBA the same thing. Hence, we decided to discuss the difference between PCB and PCBA in a way so everyone can understand it.

PCB is a bare circuit board consisting of only the signal transmitting and heat dissipation substrate. The PCBA, on the contrary, consists of different electronics components including ICs, resistors, etc.

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The ceramic circuit board has the following characteristics: high-temperature resistance, high electrical insulation, low dielectric constant, low dielectric loss, high thermal conductivity, good chemical stability, and the thermal expansion is almost can be coefficients of components.

Ceramic PCB is actually made of electronic ceramic materials and can be made into various shapes.

What Are PCB and PCBA?

PCB, as we all know, stands for Printed Circuit Board. It is the fundamental of modern-day and highly complicated electronic devices. It is made for both electrical transmission and mechanical support to the other components.

The base is made of different metals, ceramics, or other elements and it works as the substrate. It dissipates the heat to reduce the temperature of the components mounted over it. This is the mechanical support of the PCB. And electronic transmission refers to the data transfer from one component to another through the base.

However, the PCB is a bare electric circuit board. It has only the substrate and conductive parts. The electronic device manufacturer will mount the electronic components over the bare PCB. This process is called the PCBA which stands out for the PCB Assembly.

The PCBA has a different layout and uses a soldering process to complete the entire component mounting and assembly process.

The Key Difference Between PCB And PCBA

Although you might not understand, PCBA and PCVB comes with subtle differences. If you are in the PCB and PCBA industry or electronic device manufacturing, understanding these distinctions between the two essential parts of your electronic device production is important.

The key differences are-

PCB is made to dissipate the heat generated during electrical signal transmission. It has a heat-dissipating layer and an insulation layer on its top. However, it doesn’t contain any wiring or electric components. The PCBA is the next part of device manufacturing that follows PCB production. It has various components including ICs, registers, transistors, SMD capacitors, etc.
The PCB is made of scratch using various metal or non-metal surfaces. On the contrary, the PCBA is built upon the PCB. This is a key distinction between the two parts of device production. Once the PCBA manufacturer gets the PCB ready at his hand, he can work over it to assemble the various components on it.
The printed circuit board is of various types and it is determined, mostly, by the material used in its substrate. Thus, you have to look at the substrate material to find the actual type of the PCB. The list includes FR4, ceramic, or metal PCB. PCBA, however, doesn’t have such classification based on the materials.
PCB can also have single or multiple layers of substrate. Thus, it is also classified as single, dual, or multi-layered PCB. There are also flexible and rigid PCBs. Nonetheless, PCBA doesn’t have such types of variety. Its classification comes from mainly the components mounted over it.
PCB has one standard manufacturing process. However, PCBA follows multiple ways to mount the components on it. You may follow the automatic reflow soldering or wave soldering for PCBA manufacturing.
PCBA manufacturing needs a definite layout to mount the components according to the design. It differs due to the requirements of device variations. Also, the layout is a software-based design. PCB follows a generic design for all devices.

A Hint on the PCBA Manufacturing Process:

Different manufacturers follow a standard PCBA manufacturing process. The main difference comes in the soldering process primarily. Also, there are distinctions in the component types also mounted over the PCB.

The twocomponent types are-

SMD components: SMD component refers to the standard surface mount electronic devices and components. Manufacturers use SMT or surface mount technology to mount the SMD components on the PCB. You have to count the number of actual pins attached to the components to identify the SMD ones.
Through-hole components: It is also referred to as thru-hole components mainly because of their design. It has multiple leads on the base and these leads will be mounted on the PCB surface. You need to create holes using a drill machine to mount these thru-hole components on the printed circuit boards.

Another part of PCBA manufacturing is the soldering technique. Usually, the PCB and the required components to build the PCBA passes through the pick and place machine to initiate the actual soldering process.

When the PCB passes through the pick and paste machine, it places the components on the bar circuit board. It follows a design layout provided by the PCBA manufacturer to arrange the components in the proper way. The bare circuit board however has soldering glue pasted on it before it enters the machine for attaching the electronic parts.

These days, manufacturers like FX PCB usean automatic soldering process to mount the components safely over the circuit board permanently. It is also known as the reflow soldering system. It is a fast and safe process of manufacturing a bulk amount of PCBA without any faults.

Previously, manufacturers opted for the wave soldering mechanism. However, it has become outdated now. It has many flaws which have forced the PCBA producers to leave it forever.

Conclusion

The main difference between PCB and PCBA lies in the manufacturing mechanism and steps. PCB follows a generic manufacturing system. On the contrary, PCBA design varies according to the requirements of the device manufacturer. The layout is done in software and a machine is used to arrange the components according to the layout.

FX PCB manufactures both PCB and PCBA and also serves you with the design layout so you can build your device on it at ease. Also, our pricing is competitive and we offer delivery in any amount you need for the project.

Peter Gong

I am Peter Gong. I have been working in PCB and PCBA industry for 15+ years now. I have been a part of the PCB revolution with my dedication to circuit board technologies and creative ideas. I write in FX PCB to impart my knowledge on PCB and PCBA for all circuit board lovers, manufacturers, and users.