What is The Difference Between PCBA and PCB?

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Difference Between PCBA and PCB

What is The Difference Between PCBA and PCB?

January 13,  2021

 

PCBA (Printed Circuit Board Assembly) is the board with all components like ICs, resistors, capacitors etc. mounted on it.

 

PCB (Printed Circuit Board) is simply the bare board, often green, without any components mounted.

 

Here’s a picture of a PCBA followed by one of a PCB.  In this post I’ll explain how to analyze the PCBA Cost, and give important pointers on how to find & select the best PCBA assembly shops.

 

PCBA vs PCB

PCBA (Printed Circuit Board Assembly)


PCB vs PCBA

PCB (Printed Circuit Board)

A PCB (Printed Circuit Board) is a board that electrically connects electronic components 

 

To make such connections the board uses

 

  • Conductive traces
  • Pads
  • Holes

 

PCB’s can be single-sided (one copper layer), double-sided (two copper layers), or multi-layer (outer and inner layers). 

 

Multi-layer PCBs allow higher component density and design complexity.

 

PCBs are usually a laminated composite made from conductive substrate materials with layers of copper circuitry buried internally or on the external surfaces. 

 

A PCBA (Printed Circuit Board Assembly) is the board after all the components and parts have been soldered and installed on the PCB; now it performs its functions.

 

How to solder components onto a PCB? SMT or THT ? 

How to make a PCB waterproof? 

 

SMT, pads, traces on PCB (1)

 

Understanding the difference between PCB and PCBA is simple.

 

The tricky part is knowing how to source both PCB and electronic components correctly.

 

You want to make sure you source your PCB and components from trusted vendors that will deliver quality and on time.

5 Things to Know Before You Start Looking for a PCBA Manufacturer

 

1. Not Everyone Provides Small PCBAs Runs

 

To avoid wasting everybody’s time, before you send a quotation email, find out if the manufacturer you’re reaching out to does small runs or large ones only.

 

Chances are that if you order your PCBs from China you can order any amount you want.

 

This is because Chinese manufacturers have been in the business for many years.

 

They have the capacity and have already covered their overhead costs, hence manufacturing a couple dozens for you will be okay, thousands too.

 

If you’re wondering if China is the best place to buy PCBs, don’t worry I’ll answer that later.

 

2. PCBA Circuit Design Must Be Thoroughly Tested

 

If you’re ordering a PCBA you already have a PCBA design, that’s a given, but has this PCBA design been tested thoroughly? 

 

Did the engineers already build a working prototype of the electronic device to prove it works? 

 

If the above hasn’t been done then there’s no point in ordering a batch of PCBAs, chances are, eventually, you’ll encounter design issues and money will be wasted.

 

It doesn’t matter if the PCB is of the utmost quality; if the circuit design is bad, everything is bad.

 

IoT manufacturing TITOMA

 

Electromagnetic issues are a big problem in PCBAs.

 

If by the time you get to testing for electromagnetic compatibility, the waves are still not within limits, then several months of product launch delay are ahead of you.

 

Before the project can move forward, the engineering team will have to find the place where the noise is and most likely do a redesign of the board, then test again.

 

3. PCBA Manufacturers and Testing Facilities.

 

As we mentioned before, testing is vital.

 

Unfortunately, it’s also highly time-consuming, especially when you’re testing for certifications.

 

That’s why you need to make sure you partner up with a PCBA manufacturer that’ll make it as easy as possible to test your board.

 

4. The More Layers it has The More You’ll Spend

 

There are 3 main types of PCB boards layout

 

  • Single Side
  • Double-Sided
  • Multi-Layered

 

Why are Multi-layered PCBs expensive?

 

  • The manufacturing process is highly complex
  • They take way more time to test
  • They’re highly labor-intensive to produce
  • Mistakes in assembly are close to impossible to rework
  • The equipment to manufacture multilayer PCBs is expensive, not all manufacturers have it
  • Multi Layers PCBA require more time to manufacture

 

After reading all of that, why would a design engineer decide to create a multilayer PCB? 

 

Well, it’s because if done correctly, it outperforms single or double-layer PBCs in every aspect.

 

  • Smaller size
  • Lighter weight
  • Better design functionality

 

Just to mention a few of the advantages.

 

Smartphones and smartwatches usually use multilayer PCBA.

 

I’m telling you all this not because you’re going to interfere in the decision of whether the PCB should be single or multilayer; because that’s an engineering decision.

 

But, because when the DFM team, which procurement has to be part of, starts discussing the PCB design, you should raise your hand and point out that multilayer PCBs are expensive.

 

Remember, hardware is a cash flow business, you want to be really careful with your money.

 

5- Finding a Team Player is Essential

 

Now, this might sound like a filler in this list, but it isn’t.

 

The secret to designing an easy to manufacture electronic that will meet its time to market is teamwork.

 

As early as possible in the product design stage, you want to invite your PCBA manufacturer to the discussion table to make sure they have the capacity and technology to manufacture your design.

 

This is what is known as Design for Manufacturing

 

That’s why a PCB manufacturer that’s willing to cooperate is important.

 

PCBA vs PCB what are the differences (1)

Beware of Fake Components on Your PCB

 

 

When you’re looking for an electronic components provider, you don’t only have to make sure that components:

 

  • Are delivered on time
  • The price is right
  • Their End of Life stage won’t mess up your product life cycle
  • They’re not fake

You read that right- fake.

 

In case you didn’t know there’s a black market for electronic components, it’s made of what’s known as Components Brokers.

 

They currently make up for 6 to 8% of the total electronic components market and makeup as much as $60 billion’ worth.

 

They’re not components manufacturers nor authorized distributors.

 

They’re small shops that “specialize” in sourcing components that are difficult to get or that are no longer manufactured.

 

Some of these brokers are legit, some are not, so be careful because if you choose the wrong ones you risk buying counterfeit components for your PCB.

 

If you’re wondering why you would need an electronic component that’s no longer being manufactured, well, that’s got to do with poor electronic design decisions.

 

Share this article with your engineering team

 

How to reduce components’ lead time? 

 

It also has some more information on component brokers and how to deal with them.

Analyzing the Cost of PCBA

 

 

  1. Labor Costs
  2. Tooling and Set up charges
  3. Turnaround Time
  4. Quantity
  5. Technology
  6. Packaging

 

Let’s talk a little bit about each one

 

1. Labor Costs

 

This is the easiest one to understand. PCBA involves human labor and automated machinery.

 

The lower the wages in the country you choose to manufacture, the cheaper the labor costs, and the opposite holds too.

 

PCBA Custom Shape (1)

 

2. Tooling and Set Up Charges

 

If you’re looking for a custom PCB shape you’ll have to pay for tooling and set up charges for the production line the PCBA provider will have to set up.

 

If you’re looking for standard shape PCBs, then you’ll avoid tooling and set up charges.

 

3. Turnaround Time

 

You want your PCBA delivered in 5 days or in 3 weeks. The faster you want it the more expensive it will be.

 

Unless you get them done in China where turnaround time is crazy fast.

 

But for those doing it outside China, well, if you tell a PCBA manufacturer that you want your PCBs in 5 days, they’ll most likely have to 

 

  • Put some existing orders on hold
  • Work extra time and pay for expedited shipping

 

They’ll charge you more for that.

 

4. Quantity

 

Economies of scale apply here. 

 

The more units you order the cheaper the price, especially in custom boards, as you’re able to pass tooling and set up costs onto many units.

 

Order a handful of customized boards and prepare to pay a lot.

 

5. Technology

 

The total cost of PCBA is also affected by the technology used to put the components on the board, it can be either SMT or Through Hole Technology.

 

SMT can provide you with cost savings as it is a highly automated process.

 

6. Packaging

 

PCBA Ball Grid Array

Ball Grid Array

 

If your PCBs need ball grid array packaging the costs will be higher.

 

BGA takes considerably more time and effort to mount, and because it requires many electrical pins assembly costs are higher. 

 

Are PCBAs always Cheaper in China?

 

The short answer is yes, PCBA is cheaper in China.

 

Allow me to give you some numbers for more clarity.

 

30 two-layer boards, 80x90mm in size will cost you US$ 339 from a PCBA manufacturer in Germany.

 

The same units with the same specifications will cost you US$20 in China.

 

Also, PCBA manufacturers in China have turnaround times of one week or less.

 

A USA PCBA will give you a turnaround time of a month and a unit price of US$3.48/unit for a 1k units’ order.

 

The same order made to a Chinese PCBA would cost you US$0.37/unit and have a turnaround time of 5 days.

 

Even after import tariffs are calculated, PCBA in China is cheaper and faster.

 

If you want to follow this topic and see what others have to say about it visit the evvblog, they have a discussion thread about it.

 

PCBA Manufacturers Alternatives in Asia

 

I gave you some examples of what PCBA manufacturers charge in Germany and the US, but you might be wondering, what about some other low-wage Asian country.

 

Look, it’s not all about low wages and cheaper costs, it’s also about expertise and technology.

 

PCB Soldering (1)

 

Countries like Vietnam and India are good at lowering operational costs, but when it comes to complex electronics manufacturing, they lack expertise and technology.

 

One country that is becoming somewhat of an alternative – not cheaper than China though- for PCBA and electronics, in general, is Malaysia.

 

But here’s the thing about PCBA in Malaysia, as you know we manufacture B2B electronics, so we’re talking from experience here.

 

  • SMT in Malaysia is more expensive
  • SMT efficiency in Malaysia is a lot lower
  • Shipping components reels from China to Malaysia is a hassle, especially for small runs
  • Calculating labor costs is difficult as there’s a double-digit cost increase every year.
  • Assembly workers in Malaysia tend to be slower than in Shenzhen.

 

In the end, PCBA manufacturing in Malaysia is more expensive and time-consuming than in China.

What Files are Needed to Manufacture a PCBA?

 

A PCBA manufacturer will need you to send them the following.

 

Gerber Files

 

Gerber files are open ASCII vector format files that show information on each board layer of a PCB design.

 

Generating Gerber files will vary a bit depending on which PCB design software you use.

 

This is what a Gerber looks like, the different colors represent different layers.

 

PCBA Gerber File

 

Bill of  Materials (BOM)

 

The Bill of Materials will show all the components necessary to put together the PCBA.  For your own benefit it should be clear and optimized for mass-manufacturing.

 

Here you can find all the details on how to optimize a BOM .

 

Pick and Place File 

 

This is a file that shows all the components of the PCBA  and their respective x-y coordinates and rotation. You can obtain this file from whichever PCB design software you’re using.

Box Build for PCBA

 

Before we wrap things up, allow me to introduce you to something related to PCBA and that you should consider when looking for a PCBA provider.

 

Box Build.

 

It can be as simple as fitting PCBAs into simple enclosures – plastic boxes.

 

Reducing the product complexity means reducing the production cost

Perhaps a plastic box with some interfaces and displays.

 

It can also involve more complex tasks such as the installation of extra components, routing of wire harnesses, and building custom made enclosures.

 

So, when you’re looking for a PCBA manufacturer, don’t forget to ask them about their box build services.

PCBA Manufacturing Conclusion 

 

The difference between PCB and PCBA is that the first one is just the bare board, PCBA includes all the components mounted on the PCB.

 

When doing your search for a PCBA manufacturer remember

 

  • Small or large PCBA runs make a difference
  • A PCBA circuit design must be thoroughly tested before manufacturing
  • Find a PCBA manufacturer with testing facilities
  • The more layers a PCB has the more expensive will be
  • A team player is key

 

Make sure you source electronic components from reliable providers.

 

PCBA Close Up

 

 

The costs of a PCBA are calculated based on the following

 

  • Labor Costs
  • Tooling and Set up charges
  • Turnaround time
  • Quantity
  • Technology
  • Packaging

 

For PCBA manufacturing, China is still the best option when it comes to price and turn around response.

 

To bring your PCBA to life you’ll need the following 

 

  • Gerber File
  • Bill of Materials
  • Pick and Place File

 

You also want to inquire about Box Build with your PCBA manufacturer.

Eulises Quintero

Currently working as the content manager for TITOMA. With an extensive background in content marketing and a real interest in electronic products I'm able to produce some of the pieces of content you'll find here, all with the help of the TITOMA team of course. On my free time I like to travel, explore and work out.

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