Jun 2, 2020|General

Wondering what a double sided PCB is and how you can use it in your designs? Find out now in Candor’s comprehensive guide. In this guide, we’ll tell you what double sided PCB is, how to make one, when to use it, and what the benefits are. 

What is a double sided PCB?

Double sided printed circuit boards (PCBs) are the most popular PCB used today. A double sided PCB, as opposed to a single side, is used in higher technology electronics because they have two-sided traces with a top and bottom layer.

You can imagine a double sided PCB as simply two single sided PCBs on top of one another. This explanation seems obvious when you explain it this way, but the layers involved in a double sided PCB are no more complicated than a single sided PCB, there are just two of them on either side. 

When your PCB is double sided, there are closer and more routing traces available because you can alternate between a top and bottom layer rather than just relying on one layer as you do with a single sided PCB. 

With a double sided PCB board, you can mount copper and other components on both sides of the circuit board, allowing the traces to cross over one another. This allows for a more complex circuit to be built, therefore increasing the utility of the PCB.  

How do you make a double sided PCB?

The construction of a double sided PCB is not too different from a single sided PCB. There are some exceptions, of course, one being that some layers are laminated on both sides of the circuit board. We’ll go through the double sided PCB assembly process below. 

The base of the double sided PCB is made up of an insulating material called substrate. The substrate is mainly fiberglass epoxy resin. The type of base material used is what defines if a PCB board is made of Flexible PCB or Rigid PCB. In double sided PCBs, copper foil is often laminated on both sides of the substrate. 

Solder mask, which helps protect the rest of the PCB, can be found above the copper foil on both sides of the board, and silkscreen can be found above the board’s solder mask. However, the silkscreen is mainly used to add symbols and characters on the outside of the board, so someone looking at it can understand the functions of the board. 

All of the layers that you find in a double sided PCB are also found in a single sided PCB; the only difference is that each layer appears on both sides of the board as opposed to one side, hence the name.

When should you use double sided PCBs?

Because there are many benefits to using double sided PCB, which we’ll go into later, they have a wide variety of electronic applications. The versatility of double sided PCB will allow you to use it on projects like: 

* Industrial controls

* Power supplies

* Converters

* Control relays

* Instrumentation

* Regulators

* UPS systems

* Power conversion


* LED lighting

* Hard drives

* Printers

* Phone systems

* Power monitoring

* Automotive dashboards

* Line reactors

* Test equipment

* Amplifiers

* Traffic systems

* Vending machines

There are uses for double sided PCB beyond what we have listed here, but this non-exhaustive list shows you just how functional double sided PCB can be. 

Anytime you need to save time, money, or increase capability is an excellent time to use double sided PCB. There’s no one project that it’s best suited for because it has so many different applications in the field of technology. However, we’ll go into more detail about the benefits of using double sided PCBs below. 

Benefits of double sided PCBs

We mentioned earlier that double sided PCBs are more useful in creating higher technology electronics because they have two-sided traces instead of one. This provides a lot of benefits for those using double sided PCB in their industry. 

Perhaps one of the most important benefits of using double sided PCB is that they help reduce overall cost. In addition to having a relatively lower price compared to single sided PCB, double sided PCB also provides more flexibility for designers while simultaneously reducing the size of the circuit board itself. Smaller board sizes can also help further reduce cost, which is another plus. 

PCB double sided is also associated with increased circuit density and an intermediate level of circuit complexity. Increased circuit density often helps contribute to lower cost as well, as compared to more complex, multilayer PCBs. 

Double sided PCBs are often a better choice than single sided PCBs because of their complexity. If your circuit board is more densely populated to connect a lot of components, it’s better to have some components connected to the bottom side rather than all on one side. 

If you’re unable to change the size of the board size, and you need to route Vcc and GND on a single board, picking a two-layer board and routing Vcc and GND to the bottom layer will help you out. 

If you intend to sink or source current, choosing double sided PCB will most likely make more sense because of the top and bottom layer. You can use the bottom layer as a ground copper pour. For all of these reasons, double sided PCB is often the ideal choice for most professionals working in the technology fields because it’s much easier to use and is much more flexible when you do use it.

Final Thoughts

If you’re interested in a career in technology or if you’re already in the field, PCB, specifically double sided PCB, is something that you’re going to be dealing with a lot. Most of your knowledge about this will come through hands-on experience, but it’s always a good idea to read up on a subject. 

Candor can help you bring your technological vision to life, visit our site to learn more about PCB manufacturing.


Author Profile

Sunny Patel
Sunny Patel is the Engineering and Sales Manager at Candor Industries. Sunny is trained as a IPC-A-600 trainer, AS9100 Lead auditor, IPC CID and got his Engineering degree at the University of Toronto.

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