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PCB Component Placement

PCB component placement

Table of Contents

In the PCB manufacturing industry, PCB component placement is one of the most critical and essential factors. It’s not just about placing things in a circuit board but is like solving a puzzle. It affects the quality and performance of the system. 

Every component should fit perfectly and should ensure the device works as required. 

Thus, it is essential for a designer or anyone looking to understand the circuit board to understand the PCB component placement techniques. In ElePCB, we consider all the factors which is required for PCB component placement. 

Understand the Importance of PCB Component Placement

PCB Routing and Paths

The component is an essential aspect of PCB design that impacts various other elements of the final PCB product. Let’s see why the PCB component placement is essential in PCB design and manufacturing:

Functionality

The proper placement of PCB components ensures the electronic devices perform well per the requirement. 

Signal Integrity

Signal integrity is one of the most crucial aspects of PCB. The placement of PCB components directly affects the signal integrity by influencing the signal paths. 

Thus, strategic placement of components can reduce crosstalk, signal distortion, and EMI and ensure proper transmission of signal and data.

Heat Management

When powered up, electronic components are susceptible to heat generation. Proper placement of components can manage heat dissipation in PCB.

Space Optimization

PCB design affects component placement, and the practical design can save space and, thus, the manufacturing cost. Therefore, you need some experience manufacturing company to do so, as PCB component placement impacts the manufacturability of the PCB assembly process. 

Properly positioned components facilitate automated assembly, reducing production time and costs. Conversely, poor placement can lead to assembly errors, rework, and increased manufacturing expenses.

Tips and Techniques for PCB Component Placement

PCB Component placement Tips and Techniques

Group the Related Components

Carefully place the components that have similar functionality in the circuit board. 

For example, you have to place the digital and analog parts in the same category. 

Also, ensure you are not mixing the power management components with analog parts.

The aim is to avoid the noise and interference from the sensitive components. 

Thus, it’s better to plan where to place the component on PCB. You can separate areas for each component section, like analog, digital, power, high-frequency components, and more. 

Check the Heat Sources

Some components like MOSFETS, Voltage regulators, and IGBTs produce high amounts of heat. This can be a problem even if you use enough vias to dissipate the heat. 

Thus, it is recommended to place the components away from power components. It goes for all the devices that generate the heat.

Power and Ground First

First, start with proper planning for power and ground planes. This is because all the paths go to that section, so it can be used as a starting and ending point in the circuit board.

Proper planning for power and ground planes can prevent the issue of noise interference and ground loops. Don’t make any discounts on power and ground planes, especially the ground planes. This will create an issue in signal and power integrity. 

If the uniformity can’t be maintained, you need to be extra careful while taking the components across interruption. 

If the ground plane is placed on a middle layer, it is suggested to include a low-impedance route to safeguard the control signals and limit the danger of interference.

Leave Space for Traces

The latest trend in electronics is all about making PCBs smaller, especially for wearables and portable gadgets. But there’s a limit to how small we can go without causing problems. If the PCB gets too tiny, it’s tough to fit all the connections. So, when we’re putting the parts on the board, we’ve got to ensure there’s enough room for the copper wires to go between them, especially near parts with lots of pins.

  • Besides, try to include all the through-hole components on the top side of the PCB board. 
  • Also, keep the SMD, which is a surface mount component, placed on the same side of the board. 
  • Also, try to place the component in the same orientation. 
  • Try not to use the lead-free components with the one.

Special Considerations for High-Frequency and Heat-Sensitive Components

PCB Design

Handling High-Frequency Components

When dealing with parts that work fast, like Wi-Fi chips or speedy processors, it’s crucial to keep them away from things that could mess with their signals. Here’s how:

  • Keep them apart from stuff that gives off electric noise, like motors or power supplies.
  • Use short paths for their signals so they stay strong and clear.
  • Put shields around them to block any unwanted signals.

Being Smart with Heat-Sensitive Parts

For parts that don’t like getting too hot, such as computer chips or voltage regulators, you must be careful where you put them. Here’s what to do:

  • Keep them away from things that require heat, like big resistors or power parts.
  • Make sure air can flow around them so they don’t get too hot.
  • Use special tricks like extra metal bits or fins to help them stay cool.
  • Think about which way they’re facing so they can cool down properly.

Conclusion

Placing the PCB components on a circuit board depends on various factors like power, frequency, temperature, current circulations, and more. However, there are lots of calculator tools and software that could suggest the best spacing and excellent position for uniform heat dissipation without signal integrity. 

FAQs

What is the spacing for PCB components?

A rule of thumb for PCB component spacing is 100 in between each component and PCB edge, while 40mil should be considered between each component.

Why is PCB component placement important?

The proper PCB component placement can affect the reliability, performance, and manufacturing of PCB. It also ensures minimal interference, signal integrity, and efficient heat dissipation.

What are the important factors to consider while placing a component on PCB?

Factors like thermal management, signal routing, power distribution, and mechanical stress are the major factors to consider while placing a component on a PCB.

What tools can be used for effective PCB component placement?

PCB design software like Eagle, Altium Designer, and KiCad can help to provide ideas for placing a component. It also includes auto-placement features with proper design rules ensuring desired spacing and clearance. 

Does component placement impact the manufacturing?

Proper placement of the component can reduce the time of assembly and reduce the error risk, ensuring compatibility with the automated assembly process.

It is one of the most valuable tools for identifying the PCB short circuit. It is a specialized tool for examining the electrical characteristics of components concerning the board. It helps to detect the PCB short circuit quickly without any effort.

CONTACT ELE

ELE PCB has got the IS09001:2015, IS013485:2016, ROHS and FCC certifications. We can offer all kinds of services, including PCB manufacturing and PCB assembly, sample orders and batch orders. For PCB assembly, utilizing 7 high-speed SMT PCBA lines from Yamaha and Sony, to meet our customers’ needs. Our extended services include PCB design &PCB Layout, hardware design engineering, firmware &software development, and personalization. ELE company is honored as an excellent supplier from any company all around the world. We deeply believe that our good service and experience will completely meet your needs. Integrality, value and innovation are the forces that drive our success.

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About Michael

Michael is the general manager of ELEPCB, a leading PCB design and manufacturing company based in China. He has over 10 years of experience in the PCB industry, and has been involved in various projects.

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