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How to Enhance PCBA Durability and Longevity

Enhance the PCBA durability and longevity
PCB and PCBAs are extensively utilized in many electronic devices and are essential to electronics manufacturing. Do the PCB and PCBA have an expiry date? Will they expire? Yes, they also have their lifespan. PCB and PCBA shelf life depend on many variables.
Therefore, what are some practical ways to improve their durability and longevity? Today, FS Tech will investigate the most useful approaches for you.

What is PCBA Shelf Life?

The time a PCBA is in use is called its shelf life. The environment, material, PCB surface finish, and the PCBA board’s operational load are only a few of the numerous variables that typically influence it. Naturally, PCBA is typically stored for two to ten years.
Under the guidance of FS Tech professional and technical team, we can improve the longevity of PCBA through meticulous design, selection of dependable components, and impeccable manufacturing and maintenance practices. The anticipated lifespan of our provided PCBA can span from several years to several decades.
Expired PCBAs
The following are the main factors of PCABA expire:
Humid and dusty environment is not favourable for the preservation of PCBA, which will accelerate the oxidation and dirtiness of PCBA and shorten the shelf life. It is recommended to keep PCBA in a constant temperature of 25 degrees Celsius, dry, dust-free space.
The reliability of components on different PCBAs also largely determines the preservation period of PCBAs. Because cheap, low-quality electronic components will only continue to deteriorate and shorten the shelf life of the PCB A. In addition to this, substandard PCB components are also one of the reasons for total PCB failure and poor electronic performance. Therefore, the use of high-quality components has a stronger resistance to oxidation and the ability to fight against harsh environments. In turn, they can also extend the shelf life of the PCBA.
The circuit board’s surface treatment process by the air oxidation has a greater impact. Good surface treatment processes can extend the shelf life of PCBA. For example, compared with OSP and other materials, HASL PCB shelf life is longer.
The type of soldering on a PCBA also affects its shelf life, so it is best to fully study the type of soldering on a PCB and its relationship to the shelf life of the PCB.
It positively affects the shelf life of the PCB and protects your setup from weather damage, technical complexity and other issues. It is best to rely on good conformal coating to prevent PCB shelf life challenges.
PCBA running load is one of the most important factors in its shelf life. High-frequency, high-load operation produces a consistently higher shock to the board’s wiring and components, which is more likely to oxidise and cause short-circuits and circuit-breaks. Therefore, it is best to run the parameters in the middle range of the components, avoiding the peak near to extend the preservation period of the PCBA.
The way PCBs are transported is also important here. Unmonitored and reckless PCB transport can damage the structure and can also cause PCB components to fall off on the way to your customers and clients.
PCBs should always be stored in the best possible conditions to minimize damage because the temperature of the PCB storage room has an impact on them as well.

What Happens When PCBA Expires?

When our PCBAs age, they can cause damage to our products. The use of expired PCBA may bring the following problems:
PCBA circuit boards in the storage process will absorb moisture, resulting in circuit boards become brittle, in the reflow soldering high temperature welding, there may be bursting or cracking, this ‘popcorn effect’ or bursting the board phenomenon will seriously affect the integrity and reliability of the circuit board.
Storage time is too long and will lead to the adhesive layer of the adhesive hardening or drying, resulting in the separation of the circuit board layer and layer. This delamination phenomenon will cut off the conductive path between the layers, resulting in reduced electrical characteristics, and even cause intermittent failures or micro-short circuit problems.

over-warranty PCBA circuit board surface pads are prone to oxidation, resulting in poor soldering, such as false soldering, cold welding and other issues. These problems will affect the normal function of the circuit board, and even lead to component detachment or failure.

Due to the existence of the above problems, the reliability and stability of over-warranty PCBA circuit boards will be significantly reduced. During long-term use, intermittent problems may occur, affecting the overall performance and service life of electronic products.
Over-warranty PCBA circuit boards may be due to material aging, design defects and other problems, in the use of the process is more likely to expose these problems. For example, improper circuit design, layout wiring and other factors in the over-warranty may trigger more serious consequences, such as signal interference, heat build-up and other issues.
Humidity, dust and other environmental factors have a more significant impact on the over-warranty PCBA circuit boards. A high humidity environment may lead to moisture, mould, reduce insulation strength and even damage to the circuit board. Dust contamination, on the other hand, may affect the soldering quality and component contact performance.
Therefore, to avoid these problems, preventive measures and solutions such as strict control of storage conditions, regular inspection and baking, following the shelf-life use, and adopting moisture-proof measures are recommended to ensure the quality and reliability of electronic products.

Why Is the PCBA Lifespan Important?

We already know that if we use presbyopia PCB, it will damage our products. Even in the medical industry, it is directly related to the performance and reliability of medical equipment, which affects patients’ safety and health. Below, we briefly understand the importance of PCBA preservation from several aspects:

The life of a PCBA is critical to the overall quality, reliability, and cost-effectiveness of a product. FS Tech is working to extend the life of PCBAs through better materials, design practices, and testing to ensure long-term performance and meet consumer and industry expectations.

How to enhance PCBA longevity?

Tip 1: Layout Design Optimization

Unreasonable component layout design may lead to excessively long signal paths, increasing signal attenuation and crosstalk, thus affecting the performance of the circuit. At the same time, heat-generating components that are centrally arranged may lead to localized overheating, affecting the stability and life of the components. In addition, improper layout may also lead to soldering problems during the production process, increased difficulty during maintenance, as well as confusion visually, making the board difficult to understand and maintain.
Therefore, the layout design is to ensure the performance and reliability of the PCBA key link, need to comprehensively consider the signal, thermal, mechanical and production and other factors.
PCBA Layout Design Optimization

Component Placement

To ensure optimum performance and maximum board life, we must carefully plan the placement of components to optimize the layout design.
  • Heat Distribution: Place heat-generating components near areas with good heat dissipation or airflow. Use vias to connect these components to thermal planes for efficient heat transfer.

  • Mechanical Stability: Arrange heavy components near mounting points to minimize mechanical stress. Ensure that vias do not compromise the structural integrity of the board.

Trace Width and Spacing

 Correct design width and spacing reduce breakage of alignments caused by mechanical stress or thermal expansion and enhance the mechanical stability of the board.
  • Current-Carrying Capacity: Lay down design traces with required widths to carry the expected current. Make sure the vias are large enough to accommodate the current without becoming too hot.
  • Spacing: Maintain a sufficient distance between traces to minimize crosstalk and avoid short circuits. For high-voltage and high-frequency communications, this is especially crucial.

Thermal Management

Layout design optimization and thermal management go hand in hand. A reasonable layout can provide a better heat dissipation path for the board, while effective thermal management can safeguard the board’s performance and reliability under various temperature conditions.
  • Thermal Vias: Place thermal vias beneath heat-generating components to transfer heat to other layers or a heat sink. This helps distribute heat evenly across the board.

  • Heat Spreading: Use wider traces or copper pours for power and ground connections to spread heat more effectively.

  • Thermal Relief Pads: These can also be used on components connected with large copper areas, balancing heat dissipation with solderability.
  • Heat Sinks and Thermal Pads: A proper placement and contact of heat sinks or thermal pads with components to maintain the operating temperature within optimal range.

Via Usage

Layout optimization is not only about the arrangement of components but also the careful design of vias, which have a direct impact on ensuring the electrical performance and signal integrity of the circuit.

  • Via Types: Utilize different types of vias (through-hole, blind, buried) based on design requirements. Through-hole vias provide robust connections, while blind and buried vias can increase routing density in multilayer PCBs.

  • Current-Carrying Capacity: Ensure vias are sized appropriately for the current they will carry. This prevents overheating and potential failure at the via.

  • Thermal Vias: To improve heat dissipation and lower thermal stress, use thermal vias to link component thermal pads to internal ground or power planes.

  • Mechanical Reliability: Verify that the board’s mechanical integrity is not compromised by placement. Vias should not be positioned in regions of significant mechanical stress or too near the margins.

     

Tip 2: Material Selection

Since material selection greatly affects the assemblies’ longevity and durability, it is an extremely vital step in the fabrication of high-quality PCBAs. The solder mask, copper layers, substrate, and other parts all significantly impact the board’s performance and dependability. This comprehensive guide on material selection can improve PCBA’s lifetime and durability:

So choosing the right materials is crucial in producing high-quality PCBAs, as material selection plays a vital role in enhancing their durability and longevity. The substrate, copper layers, solder mask, and other components significantly impact the board’s reliability and performance. Here’s a detailed guide on how material selection can enhance PCBA durability and longevity:

PCBA Material Selection

Substrate Material

Classification of PCB materials

Take into account the importance of substrate materials, as they provide the basis for the support and electrical connection of electronic components.

  • FR-4: FR-4 is the most widely used substrate material because it strikes a reasonable mix between availability, cost, and performance. It works well for the majority of common applications.
  • Polyimide: Polyimide substrates provide excellent heat stability and flexibility for high-temperature applications. They are ideal for aerospace, automotive, and other harsh environments.
  • Ceramic:  This medium suits high-power and high-frequency applications with superior electrical insulation and good thermal conductivity.
  • Metal Core PCBs: MCPCBs are substrates of copper or aluminum. These substrates are preferred for such applications because they possess superior heat-dissipating properties, thereby making them ideal for power electronics and LED applications.

Solder Mask and Silkscreen

In an in-depth discussion of PCB layout optimization, it is inevitable to consider the use of pad masks and silkscreen printing, which play a vital role in improving board functionality, durability, and assembly efficiency.

  • Solder Mask: To shield copper traces from oxidation and environmental harm, use a premium, heat-resistant solder mask. During assembly, this layer also avoids solder bridges.
  • Color and kind: Although the solder mask’s color is primarily decorative, its kind (gloss, matte, etc.) may have an impact on inspection procedures and light reflection.
  • Silkscreen: To guarantee that labels and identifiers stay readable for the duration of the product’s life, choose long-lasting silkscreen inks that won’t fade when exposed to heat or other environmental factors.

Solder and Surface Finish

We next look at solder and surface finishes, which are also key factors in ensuring board performance and durability.

  • Lead-free solder: To adhere to environmental standards (such as RoHS), use lead-free solder. Alloys with good mechanical qualities and resistance to thermal fatigue include SAC305 (tin-silver-copper).
  • Surface Finish: Select the right surface finish according to the application and assembly method. Among the options are: HASL (Hot Air Solder Leveling), ENIG (Electroless Nickel Immersion Gold), and OSP (Organic Solderability Preservative).

Tip 3: Protective Coatings

Protective coating, also known as triple-proof paint, is a special coating applied to PCBAs to protect electronic components only from environmental factors. This coating targets three main environmental threats: moisture, dust, and chemical corrosion. Through the application of protective coating on electronic components and circuit boards, Triple Proof Coatings have been able to extend the product’s life and enhance its reliability effectively.

Conformal Coating on PCBs

These protective coatings can be divided into two types depending on whether or not they are removable by chemical solvents: solvent-removable coatings like acrylic coatings, and non-solvent-removable coatings like epoxy and Paraline coatings. Selection of the correct protective coating to use involves consideration of its moisture resistance, chemical resistance, temperature resistance, dielectric properties, thickness, and so forth.

Coatings prevent moisture ingress, which can lead to corrosion and electrical shorts, ensuring long-term reliability.

Protects against exposure to harsh chemicals and solvents that can degrade materials and components.

Helps the assembly withstand temperature fluctuations and extreme heat, preventing thermal expansion and contraction damage.

Provides a buffer against mechanical shocks, vibrations, and abrasion, which can physically damage the board and components.

Improves electrical insulation between components, reducing the risk of shorts and ensuring stable performance.

Key parameters for protective coatings include: Coating thickness, dielectric strength, thermal stability, chemical resistance, moisture resistance, and mechanical properties.

Tip 4: Soldering Techniques

Because solder joints are often considered the “weakest link in the chain” regarding PCBA, strong methods of soldering are necessary to improve the resilience and longevity of the assembly. Indeed, enhancing soldering strength is crucial for extending the assembly’s lifetime. Some of the approaches to take in this regard are:

PCBA Reflow Soldering
PCBA Reflow Soldering

Controlled Reflow Soldering

Controlled reflow soldering produces extremely repeatable and dependable solder junctions by carefully regulating the temperature profile. By guaranteeing constant solder quality, this technique lowers the possibility of flaws and raises the assembly’s overall dependability.

Wave Soldering

Because it produces consistent and robust solder junctions, this method is perfect for through-hole components. Large component volumes are handled well using wave soldering, which maintains the assembly’s mechanical and electrical integrity.

Selective Soldering

For mixed-technology PCBAs, selective soldering is especially helpful since it enables the targeted soldering of specified regions while preserving sensitive components. By reducing heat stress on sensitive components, this method safeguards fragile circuits and improves the overall PCBA’s durability and dependability.

Tip 4: Moisture and contaminant Control

Moisture and other impurities can cause a PCBA to corrode, experience electrical shorts, or fail. Therefore, one of the most important ways to guarantee the longevity and durability of PCBAs is to minimize moisture and contamination. Methods to lessen these elements consist of:
SMT cleanroom
SMT cleanroom

Desiccants

Use desiccants in the package to absorb moisture while the PCBAs are being stored and transported. It will keep the atmosphere dry and prevent harm from moisture.

Cleanroom Production

To reduce exposure to dust and other airborne particles, PCBAs are manufactured in a cleanroom setting. To avoid static electricity that could draw dust, which could pollute and jeopardize the circuits, use antistatic. This safeguards delicate components and guarantees a cleaner assembling procedure.

Sealed Enclosures

Protect the PCBAs from severe environmental conditions using sealed enclosures, properly sealed and gasketed against moisture/contaminant entry into the assembly for enhanced durability and reliability.

Tip 5: Environmental Considerations

The particular environmental conditions the assembly will encounter must be taken into account when improving the robustness and endurance of PCBAs. Diverse settings provide distinct difficulties, and customized approaches can lessen possible problems with moisture, pollutants, and other environmental elements.

PCB simulations
PCB simulations

Temperature Tolerance

Design engineers should only include electronic components in the Bill of Materials (BOM) that are rated to function well at the high or low temperatures anticipated in the application environment when choosing components for the PCBA. This guarantees that the assembly won’t fail when subjected to heat stress.

High-Humidity Environments

Use moisture-resistant materials and coatings, like encapsulation or conformal coatings, to safeguard PCBAs in high-humidity situations. Long-term dependability is ensured by these protective coatings, which stop moisture intrusion that might cause corrosion and electrical shorts.

Corrosive and Chemical Exposure

Use coatings and components with chemical resistance for areas where exposure to chemicals may occur. To create a barrier against corrosive substances, think about applying potting compounds or conformal coatings.

Mechanical Stress

Flexible coatings and secure mounting can assist absorb mechanical stress in settings that are prone to shock or vibration, lowering the chance of solder joint and component damage.

Tip 6: Continuous Improvement and Feedback

Enhancing the robustness and dependability of PCBAs requires constant input and modification. Manufacturers may enhance processes, guarantee long-term success, and increase product quality by putting in place an organized approach to feedback and iterative enhancement. Here’s how to successfully incorporate feedback and ongoing improvement into PCBA development:

PCBA test
PCBA test

Establish Feedback Loops

  • Customer Feedback: Collect regular feedback on the product’s performance and reliability in real-world applications. This information can highlight areas for improvement and guide future design changes.

  • Supplier Collaboration: Work closely with component and material suppliers to receive feedback on material performance and potential improvements. This collaboration can lead to enhanced material selection and better supply chain practices.

  • Internal Audits: To find inefficiencies and potential improvement areas, conduct routine internal audits of manufacturing processes. Make use of these audits to improve quality control and guide process improvements.

Implement Process Improvements

  • Root Cause Analysis: To find the underlying causes of problems, conduct in-depth root cause analyses when they occur. Make focused adjustments based on these observations to stop recurrence.

  • Lean Manufacturing: To reduce waste, boost productivity, and improve product quality, implement lean manufacturing concepts. Finding process variances and putting remedies in place can be aided by methodologies like Six Sigma.

  • Agile Methodologies: Iterative improvements based on input and test findings are possible when agile approaches are incorporated into the design and development process.

Enhance Testing and Validation

  • Expanded Testing Protocols: Continuously update and expand testing protocols to cover new potential failure modes and environmental conditions. This ensures that PCBAs are thoroughly validated before deployment.

  • Simulation Tools: To anticipate probable failure sites and optimize designs for longevity, use sophisticated simulation tools. This preventative measure may lessen the need for subsequent, expensive redesigns.

  • Prototyping and Iteration: Create prototypes, then test and improve designs repeatedly in response to user feedback and test results. Early in the development cycle, this method aids in the identification and resolution of problems.

Encourage Cross-Functional Collaboration

  • Interdepartmental Teams: To exchange ideas provide all-encompassing solutions to problems, and encourage cooperation between the design, engineering, manufacturing, and quality assurance teams.
  • Knowledge Sharing: To spread best practices and lessons gained throughout the company, use knowledge-sharing techniques like frequent meetings and seminars.
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Measure and Track Performance

To keep tabs on PCBA performance in the field, continuous monitoring systems should be put in place. Make well-informed decisions regarding customer service and product improvements using this data.

Conclusion

Careful considerations of design, material selection, and manufacturing procedures can enhance robustness and endurance in printed circuit board assembly. Applying protective coatings, using the right materials, and enhancing layout design can greatly increase the performance and dependability of their PCBAs for manufacturers. Long-term durability also depends on strong soldering methods and efficient moisture and contaminant management.
By implementing these best practices into our production procedures, FS Tech concentrates on producing dependable PCBAs. Our dedication to quality guarantees that our products satisfy the requirements of many applications, enabling our clients to confidently accomplish their objectives.

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