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All about SMD/SMT and what they entail

Surface Mount Technology (SMT) and Surface Mount Devices (SMD) considerably speed up the PCB assembly process. Instead of using traditional means of electronic assembly, which features the use of wire lead and huge components. Manufacturers are now leaning onto minute components to save cost and produce electronic devices in bulk.

If you open up any modern-day commercially made device, you will note that most if not all of its components are minute. So how is this possible? Well, that is where SMT and SMD come in. SMD and SMT allow manufacturers to mount minute components onto PCBs. In doing so, they save on cost and utilize less time in the manufacturing process. In that case, you get commercial electronics that are cheap, compact, and that function incredibly. But what exactly does SMD/SMT entail? Why are they useful? And what are the differences between the two? To find out more, follow along and let us unravel this mystery.


Surface mount technology (SMT) is simply a new tech design manufacturers use to arrange various components printed onto a PCB. Previous mounting versions were not as effective as SMT due to the use of holes to mount components. These traditional methods require careful preparation to ensure that all the lead you use fits various PCBs. The leads should also form the correct technique. It also needs a relatively larger PCB that can fit more than one circuit.

However, using SMT machine, the PCB assembly process becomes pretty efficient. That’s because you solder various components onto the PCB directly. Also, this impressive technique doesn’t require you to pass leads through your PCB. It is hence:

  • Simple
  • Efficient and,
  • Cost-effective

What’s more, SMT saves you a lot of space as you can mount components on both sides of the board. Moreover, you get to accommodate many components on a single PCB in so doing.

Therefore if you sometimes wonder how compact components pack great features nowadays. Then now, you have the answer; it is all about space utilization in the best way possible.

When working with a minute component, the error probability goes up. However, that is not a huge issue with SMT since you can easily fix errors using molten solder. In traditional methods, fixing errors was complicated and lengthy. However, with SMT, you face low wire attachments, and you do not have to drill holes onto the PCB, which saves you a lot of stress.

What is even more fascinating about SMT is that it features little to no lead making it eco-friendly. It also has solder joints and primary components on the same side of the PCB.

Features of SMT

  • Components have short leads or ultimately no leads
  • Solder joint and the components for the main body lie on the same PCB side


Surface mount devices (SMD) are the various components you find fitted onto a PCB. These components are pretty ideal in an era whereby people are looking for devices that are:

  • Cost-effective
  • Flexible
  • Faster

These features are what’s making SMD evolve and gain popularity pretty fast.

Previously, manufacturers were wiring SMDs onto various circuit boards, but now things have taken a turn. Modern-day SMDs come with pins that manufacturers use to solder them onto PCBs, making the entire process pretty easy.

With SMDs, tiny components can ensure that you achieve functionalities that equal the use of larger components. If so, then these components do not just save on space. They are also more functional. All these make it possible to place more circuits on a single board, and since you do not have to drill PCBs, the process becomes:

  • Fast and
  • Cost-effective

What’s more, SMDs also provide:

  • Fewer RF signals effects which are unwanted
  • Higher frequency performance

Since SMDs are tiny and easy to use, they are also cheaper than traditional SMDs, which need holes for installation. Hence utilizing SMD/SMT saves you more than you can even imagine. A combination of this two brings in a new era of technology.

SMD features

  • Miniaturization
  • Great for PCB surface assembly
  • No lead (short or flat lead)

SMD Types

Chip resistor

Chip resistors have three digits which you can find on the body of the chip resistor. These three digits show the chips resistance value.

Net Resistor

Network resistors are packages that have a couple of resistors in one parameter. Digital circuits use this feature extensively.


As of the 21st century, you can only find two standard capacitors in the tech market:

You, however, need to clearly distinguish between the two’s polarity.


Diodes are pretty popular in the SMD world. As a result, manufacturers working with SMD/SMT highly utilize diodes in their projects.


Two classes of Light Emitting Diode (LEDs) exits.

  • Ordinary LEDs
  • LEDs having high brightness, for example, blue, red, yellow, and white

You should also note that manufacturing guidelines determine LED polarity.


Mostly, transistors are either:

  • NPN or
  • PNP

They can also be either be:

  • Crystal Oscillators
  • Fuses
  • Transformers
  • Inductors


Integrated circuits are pretty important functional components of electrical products. Moreover, ICs are pretty complex and efficient, making them appropriate for SMD/SMT processing.


SMT utilizes mounting tech to mount and solder components onto PCBs. On the other hand, SMD refers to the use of various components that manufacturers mount onto PCBs using SMT tools. In addition, the SMD technique utilizes components that manufacturers solder onto PCBs using soldering paste.

Commercial manufacturing of electronic devices utilizes SMT as it is cost-effective. By using SMTs, manufacturers get to provide electronic devices to you as the client in a cost-effective manner.

SMT also offers stronger bonds ideal for various components built under stress.

Where SMD and SMT combine

Manufacturers use SMD/SMT in the PCB assembly process, and hence if you wish to tackle a similar problem, you should follow the same plan. However, the technique you will use greatly depends upon the material you will be using.

Another important thing to note is that you should always use the proper gadgets to get the right results. Utilizing the wrong tools has catastrophic results, which you do not want.


Tech advances every day, and so does how things function in the tech industry. A change in how components connect onto PCBs is one area that has undergone great changes. These changes have brought about faster manufacturing of compact electronic devices. Therefore, now we have many tiny smartphones that work better than the tall telephone booths from the 90s. Hence, for the question “is SMD/SMT necessary in the 21st century?” we would say, yes, pretty much.

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