How do I determine whether my project requires a custom PCB or a generic PCB?

Every electronic and most electrical device requires a custom-designed PCB to accommodate all connections. However, when developing prototypes, people sometimes consider using generic PCBs because the manufacturing process for custom PCBs is too complex. While this might save you some time and money, it can impact the prototype’s functionality. Furthermore, you’ll ultimately need to design and assemble the PCB after sampling the prototype. So why go for a custom PCB? Prototypes made with custom-designed PCBs perform better in the long run and accurately demonstrate their functionality. They are also designed based on the prototype’s overall structure, ensuring proper mounting. Generic PCBs can take up more space and may be difficult to operate if they are smaller than your requirements.

In short, while PCB manufacturing is complex, a PCB specifically designed for your prototype is always better than a generic PCB. So how do you determine whether a project needs a generic PCB or a custom PCB? Read on to explore the entire decision-making process step by step.

What are custom PCBs and generic PCBs?

PCBs can be broadly classified according to the number of layers, substrate type, manufacturing type, complexity, and so on. All these variations are driven by the different requirements of many applications. In PCB design and manufacturing, general-purpose PCBs and custom PCBs are two categories with distinct characteristics.

General PCB

Standard printed circuit boards (PCBs) are a category of PCBs that follow standard design guidelines in terms of materials, dimensions, and trace specifications. The most common lamination material for standard PCBs is FR4, with standard thicknesses ranging from 1.6 mm to 3.2 mm. Therefore, standard PCBs are more cost-effective than custom PCBs due to their standardized production specifications.

Custom PCB

Custom PCBs are another type of PCB designed and manufactured according to specific requirements, and therefore may differ from standard specifications. Consequently, custom PCBs are more expensive than standard PCBs. Custom printed circuit boards can have special characteristics, such as better thermal performance, higher mechanical strength, and customized surface finishes.

Key advantages of using general-purpose PCBs

General-purpose PCBs are built for a specific purpose with no room for modification. This is why general-purpose PCBs are ideal for learning, prototyping, and early development, while production boards are built for real-world performance and stability. Therefore, general-purpose PCBs offer several advantages.

Reduce costs and risks in early product design

Using a generic PCB helps you avoid wasting money when trying out new ideas. In the early stages, you don’t need to spend too much on custom boards. If a mistake occurs, you can fix it immediately without wasting time or starting over completely. It’s a safe and smart way to test your designs.

Easy customization, rapid iteration

Using a universal PCB, you can easily move objects and experiment with different settings. You’re not locked into one layout, so you can change your design at any time. This helps you test faster and find the best approach in a timely manner.

A bridge between concept and production

A universal PCB can help you turn your ideas into reality. Before creating the final version, you can test it and ensure everything works correctly. Once you have confidence, mass production becomes much easier and there will be fewer problems.

Temporary testing and permanent mass production

A general-purpose PCB is designed for temporary use, especially in the early stages of development. Here, ideas can be tested, modified, and improved. On the other hand, a final production PCB is designed for long-term use of the finished product. It is made with precise layout and specific materials, allowing for mass production.

The role played in the process of turning ideas into products

General-purpose PCBs act as a bridge between initial ideas and working equipment. They help you experiment, check for errors, and see how everything fits together before submitting the final version. Once the design is confirmed to be feasible, it becomes easier and more confident to continue creating production-ready PCBs.

Flexibility and Specialization

The reason why general-purpose PCBs are so useful is their flexibility. You can replace components, test different layouts, and make adjustments as needed, all on the same board. In contrast, production PCBs are specialized.

Key advantages of using custom PCBs

Custom PCBs (printed circuit boards) offer design flexibility, allowing for the production of end products that meet customer specifications while balancing cost, quality, functionality, and reliability. The advantages of custom PCBs are outlined below, making them the optimal choice for the electronics manufacturing industry.

Cost feasibility

Custom PCBs allow for modifications to different types of materials, design iterations, and processes to reduce costs and assembly prices.

Design flexibility

Using custom PCBs allows designs to be tailored to meet specifications for required device performance, material combinations, and geometries. For example, custom PCB assembly is not limited to rigid types and can support other laminate types, such as flexible polyimide and rigid FR4 substrates.

Performance and Reliability

As mentioned earlier, custom circuit board assembly requires design and prototyping to evaluate the design’s performance. At this stage, Design for Manufacturing (DFM) is also performed to ensure compliance with design rules and requirements, thereby achieving consistent manufacturing output. Some software can already automatically provide feedback on the design evaluation.

Price and cost

This factor cannot be overstated. A suitable custom PCB supplier should be able to provide reasonable quotes for materials, assembly, and tooling. In the initial stages, cost is the quickest indicator of whether a supplier can be further evaluated to the next level.

quality

Despite the high cost, a supplier is not an ideal partner for custom PCBAs if their quality control is inadequate. Suppliers must be able to provide evidence that they can handle parts correctly and consistently. They must provide certifications from internationally recognized companies such as IPC and UL to demonstrate their compliance with standards.

Delivery time

A key factor in choosing a reliable supplier is their ability to deliver parts within a short timeframe. Note that the PCB is just one part of a larger supply chain, so it’s crucial that parts are shipped in the promised quantity within the agreed timeframe.

ability

A suitable custom PCB supplier must have an assembly line with machines capable of processing parts to specifications. For example, if the PCB design has very limited width and spacing, and the board is to be placed through a component placement machine that cannot handle complex board designs, the result could be serious malfunctions. Therefore, the machine’s tolerances, processing, and inspection capabilities must be discussed with the supplier.

Basic manufacturing process applicable to general-purpose PCBs and custom PCBs

The basic process of PCB manufacturing covers core steps such as inner layer fabrication, lamination, drilling and electroplating, outer layer fabrication, and surface treatment. The entire process begins with the confirmation of engineering data and goes through dozens of precision procedures to finally achieve the final product.

Cutting	Large copper-clad laminates are cut into the sizes required for production.
Inner layer manufacturing	Inner layer circuit patterns are created on copper foil through lamination, exposure, development, and etching.
AOI optical inspection	Check the inner layer wiring for short circuits or open circuits.
lamination	The inner layer board, prepreg (PP) and outer copper foil are bonded together under high temperature and pressure.
Mechanical drilling	Use a CNC drilling machine to drill interlayer through holes and insertion holes at designated locations.
Deburring and cleaning	Clean the residue and burrs produced during drilling.
Chemical copper plating/electroplating	Electroplating copper is applied to the hole walls to achieve electrical connections between multilayer boards.
Outer graphics	The outer copper surface is then laminated, exposed, and etched again to form the outer circuitry.
Solder mask and characters	Apply green solder resist to protect non-soldered areas and print white text labels.
Surface treatment	Exposed pads can be treated with processes such as HASL (Hydrogen Spray Soldering), ENIG (Engineering Injection Gold), or OSP (Optical Stamping) to prevent copper surface oxidation.
Electrical testing	Perform flying needle testing or specialized fixture testing to ensure the pathway is functioning correctly.
External milling and final inspection	The PCB is separated from the main board into an independent shape, and then the final quality inspection and packaging are completed before shipment.

Two dimensions determine whether to choose a general-purpose PCB or a custom PCB.

PCB manufacturing is an indispensable part of the electronic product development process. It helps R&D teams quickly verify the rationality and functionality of circuit designs, reducing the risks of mass production. Currently, the production of both general-purpose and custom PCBs covers all sub-sectors of the electronics industry, and the parameter requirements for PCBs vary significantly depending on the product’s application. Therefore, when unsure whether to use a general-purpose or custom PCB for a project, the following two dimensions can help determine the appropriate choice.

Judgment and selection of PCB application areas

The applications of PCBs are currently very broad, ranging from consumer electronics such as smart alarm clocks and LED displays, to industrial applications such as security data transmission equipment and industrial control devices, and further to specialized fields such as automotive electronics, medical equipment, drones, and communication equipment. All of these require PCBs as core foundational components to carry circuit functions. Different fields have varying requirements for PCB parameters such as precision, number of layers, temperature resistance, and anti-interference capabilities. For example, security data transmission equipment has higher requirements for signal transmission stability, while consumer electronics prioritize cost-effectiveness. Therefore, when selecting a manufacturing service provider, it is necessary to match the capabilities to the specific characteristics of your product.

Judgment and selection in PCB manufacturing

Choosing a custom PCB to achieve your design goals for your project also means you’ll incur higher costs. Custom PCBs require some upfront costs, as well as other non-recurring engineering expenses related to tooling and fixtures. This also means the product can be marketed at a higher cost and with unique features. Choosing a custom PCB supplier who can provide technical and administrative support ensures the product functions as expected, and the cost of custom PCBs will be more reasonable.

On the other hand, generic PCBs are a cheaper option, with much simpler manufacturing and assembly steps. The design is not as complex as using standard design guidelines. The size and geometry choices for generic PCBs are less flexible than for custom PCBs. Operational scope and product functionality are also expected to be limited, resulting in a lower final product price compared to custom PCB designs. Therefore, generic PCBs are more popular due to the higher cost of custom PCBs.

General PCB Manufacturing VS Custom PCB Manufacturing

We’ll briefly explain the differences between general-purpose PCBs and custom PCB manufacturing from three dimensions: usage scenarios, core features, and a selection table. This will help you quickly decide whether to choose general-purpose PCBs or custom PCB manufacturing services.

Comparison items	General PCB manufacturing	Custom PCB manufacturing
Applicable Scenarios	Standard circuit testing, teaching experiments, simple electronic DIY projects, or prototype verification.	Final product mass production, complex smart hardware, special form factor constraints, or high reliability requirements (such as automotive electronics and medical devices).
Core features	Fixed dimensions and wiring, use of standard materials, low cost and fast delivery.	Fully customizable design (Gerber file customization), supports multi-layer boards/blind/buried vias/special materials, and process parameters can be strictly matched.
Selection Criteria	Your circuit diagram can use readily available standard board layouts, without the need for special asymmetric dimensions, high-frequency impedance control, or special layer counts.	Your product has a unique housing structure, special radio frequency performance, stringent industry standard certification requirements, or needs to be mass-produced.

Common application areas of general-purpose PCBs and custom PCBs

Choosing the right printed circuit board (PCB) for your project is crucial to the success and efficiency of your electronic device manufacturing. PCBs are a component of almost all electronic products, responsible for enabling electrical connections between numerous electronic components. Common applications of both general-purpose and custom PCBs include the following.

Medical equipment

Medical devices that frequently utilize PCBs during design include monitors, imaging systems, and even implants. They help engineers test that everything is working properly before creating the final version. This step is crucial because medical devices must be safe and reliable.

Consumer electronics

Many products we use every day, such as smartphones, tablets, and smartwatches, begin with PCBs. These boards are ideal for testing how parts fit together and work together. It’s a simple way to solve problems early and build better devices.

Industrial equipment

In factories, machines require powerful and stable electronics. Developers test their ideas on PCBs before using high-end materials. This applies to applications such as robots, solar systems, and power tools operating in harsh conditions.

car

Modern cars have more electronic components than ever before. Features including safety sensors, navigation, and entertainment systems are all tested on PCBs first. This helps ensure they function properly even in hot, cold weather or when the car is in motion.

Geyuan Electronics’ core advantages in PCB manufacturing services

When many customers are looking for PCB manufacturers, their biggest concerns are “Can you make it?”, “How well will you make it?”, and “Can you guarantee the delivery time?”. Geyuan Electronics has extensive experience in PCB manufacturing services and has established the following core advantages to completely resolve these concerns:

Process and technological advantages

We can manufacture high-multilayer PCBs with up to 40 layers, an aspect ratio of up to 15:1, impedance accuracy of ±5%, and layer offset of ±0.02mm—all industry-leading specifications. We have a dedicated R&D team that continuously optimizes processes and overcomes various technical challenges in PCB manufacturing. For example, our recently developed 40-layer lamination process achieves a yield rate of over 95%, far exceeding the industry average of 70%.

DFM and engineering capabilities

We also offer a dedicated Design for Manufacturing (DFM) audit service. After clients provide us with Gerber files, our engineers conduct a detailed DFM audit to identify design flaws that could hinder production, such as excessively thin linewidths, small apertures, or inadequate stack-up designs. This allows for proactive optimization and prevents production issues. For many clients, our DFM audits have increased production pass rates from 60% to 98%, resulting in significant cost savings.

Production base and advanced equipment

Our production bases in Dongguan and Shenzhen, China, are equipped with a full range of high-end PCB manufacturing equipment: high-speed drilling rigs, fully automatic laminators, LDI laser exposure machines, AOI optical inspection instruments, TDR impedance testers, X-Ray layer offset testers, etc., all of which were introduced in the last three years and are at the forefront of the industry.

PCB production capacity

Our PCB production capacity allows us to produce 1,000 prototypes and 10,000 square meters of PCBs per month, meeting the entire process from prototype to mass production. Our prototype delivery cycle is 5 days for 20-layer boards, 7 days for 30-layer boards, and 10 days for 40-layer boards, which is more than 30% faster than the industry average. Many clients have tight deadlines; other factories take 15 days, but we can deliver in 7 days, helping them gain a competitive edge in the market.

Quality Inspection and Assurance

Our PCB manufacturing, whether general-purpose or custom-made, boasts a yield rate exceeding 98%, far surpassing the industry average of 80%. We have a rigorous quality control system with 12 inspection checkpoints from raw material warehousing to finished product delivery, ensuring every board is qualified. We also offer a lifetime warranty; any board manufactured by us will be repaired free of charge for non-human-caused damage.

Excellent customer service

Our service is excellent. For any customer issues, our engineers will respond within 2 hours and provide a solution within 24 hours. Many customers encounter problems with their boards and when they contact other factories, they either face delays or are simply unreachable. But when they contact us, we immediately analyze the cause, provide solutions, and, if necessary, even remake the boards for free.

Conclusion

Choosing the right PCB is crucial to the success of your project. Selecting the right PCB not only improves manufacturing efficiency but also increases the probability of project success. However, general-purpose PCBs and custom PCBs each have their advantages and disadvantages. You can make your judgment based on the information and reference points provided in this article. The analysis points mentioned in this article are excerpts compiled from years of experience by the engineering team at Geyuan Electronics.

Furthermore, whether you need a generic or custom PCB, it requires choosing a partner who understands your unique needs and has the knowledge and experience to produce high-quality printed circuit boards. The best PCB manufacturers offer consistent quality assurance, rapid manufacturing progress, and reasonable prices. In addition, the ability to quickly prototype, effectively manage a global supply chain, and handle projects of all sizes, including those with low minimum order quantities, is crucial. Finally, the ideal PCB manufacturer will meet your project needs, providing a smooth, supportive, and cost-effective relationship to ensure the project’s success from start to finish.