PCB Single-Sided Board Manufacturing Process, Advantages, Disadvantages and Applications
In today’s intelligent era, the internal PCB designs of electronic products required by the market are becoming increasingly complex, with PCB layer counts and miniaturization being major trends. However, simple and practical single-sided PCBs remain an important component of modern electronic product manufacturing. Whether for prototyping, DIY electronic projects, or cost-effective consumer electronics manufacturing, single-sided PCBs are an efficient and economical choice. Although multilayer PCBs have become the preferred choice for high-speed, high-density intelligent applications, single-sided PCBs remain widely popular due to their high cost-effectiveness and short manufacturing cycles.
This article will provide you with a comprehensive explanation of single-sided PCB manufacturing: from material selection, manufacturing process, surface treatment technology, advantages and disadvantages analysis , application fields, and future changes in manufacturing methods , helping you improve the accuracy of project decision-making and cost control capabilities.
Basic Concepts of Single-Sided Printed Circuit Boards
Single-sided PCBs are widely used in consumer electronics due to their low cost and heavy weight. They are also in high demand in home appliances and consumer goods because of their low price and low cost. A single-layer PCB, also called a single-layer copper-clad PCB, has copper clad on one side and epoxy resin glass insulation on the other. The thickness varies depending on product requirements, ranging from 0.8, 1.0, 1.2, 1.6, to 2.0 mm, with thicker options available for customized or special product needs. Single-layer PCBs have flame retardant requirements, such as FR4 (flame retardant grade 4), and the PCB material must meet international and domestic certifications, such as UL, and comply with CCL and RoHS (hazardous substance restrictions), including requirements for bromine, halogen-free materials, copper foil, prepreg, and chemical additives.
Basic manufacturing process of single-sided printed circuit boards
A single-sided PCB refers to a basic PCB where components are concentrated on one side, while traces are concentrated on the other side; the traces only appear on one side. Because single-sided PCBs have many strict limitations in circuit design (since there’s only one side, traces cannot intersect and must follow their own independent paths), understanding the manufacturing process of single-sided PCBs can help you optimize your design and reduce error rates.
| Cutting copper-clad laminates | When cutting copper-clad laminates, pay attention to the cutting specifications and bake the board before cutting . |
| Grinding plate | The cut copper-clad board is cleaned in the grinding machine to remove dust, burrs and other debris from the surface, combining the two processes into one . |
| Printed Circuit | Circuit diagrams are printed on one side of the copper foil; the ink has anti-corrosion properties. |
| examine | Remove excess ink, add ink to areas without ink, and if numerous defects are found, adjustments are needed. Defective products can be placed in the second step of etching for ink cleaning, and can then be returned to this channel for further processing. |
| Prepare | The ink is ready to dry. |
| Etching | The process of etching away excess copper with a reagent, leaving the copper on the circuit with ink, followed by cleaning the ink off the circuit with a reagent and then drying it, is a single, integrated process. |
| Drill positioning holes | Drill positioning holes on the etching plate |
| Grinding plate | Clean and dry the board with the positioning holes drilled, just like board 2. |
| silkscreen | The insert components are screen-printed on the back of the substrate, along with some marking codes. After screen printing, the components are dried, combining the two processes into one. |
| grinding disc | Clean again |
| Solder resist | Green solder resist is screen-printed onto the cleaned substrate. No green solder resist is needed on the solder pads. The substrate is then dried directly after printing, combining the two processes into one. |
| forming | Forming is done using a punch. If V-pit treatment is not required, it can be formed in two stages. For example, for small round plates, first punch from the silkscreen side to the solder mask side to form a small round plate, and then punch from the solder mask side to the silkscreen side for insertion holes, etc. |
| V-cut | Small round plates do not require V-cut processing; the substrate is cut out of the slot by a machine. |
| rosin | First, the board is sanded to remove dust, then dried. Next, a thin layer of rosin is applied to the side with the solder pads. These three processes are done in one step. |
| FQC test | Check if the substrate is deformed, and whether the holes and circuits are of good quality. |
| flatten | Flattening the deformed substrate is not required in this process. |
| Packaging and shipping | Customized packaging and transportation arrangements will be made according to the project design requirements. |
| Remark | The sanding process between the screen printing and solder mask layers can be omitted. Solder masking can be done first, followed by screen printing, depending on the substrate. |
Materials commonly used in single-sided PCB manufacturing
Different materials directly affect the heat resistance, mechanical strength, and final price of the PCB. The following are common substrates used in single-sided PCBs (the copper layer thickness of these substrates is generally between 0.5oz and 2oz, with a standard thickness of 1oz (approximately 35 micrometers)).
| FR4 (fiberglass board) | Most common, economical and durable |
| Aluminum substrate | It has good heat dissipation performance and is commonly used in LED lighting. |
| CEM-1 | Lower cost, suitable for simple, low-end products |
Advantages and disadvantages of single-sided printed circuits
The use of single-sided PCBs in many scenarios is inseparable from their advantages. However, despite the many advantages of single-sided PCBs, their limitations are also very obvious in the electronics industry where functional requirements are becoming increasingly complex. We have summarized the advantages and disadvantages of single-sided printed circuit boards as follows.
Advantages of single-sided PCBs
| Low production cost | The production process of single-sided boards is simple, requiring only etching and electroplating on one side. The material and manufacturing costs are significantly lower than those of double-sided and multilayer boards. |
| Mature manufacturing process | Single-sided panels have a long history and very mature technology, with few technical challenges in production. This not only shortens the production cycle but also reduces rework rates and increases the yield. |
| Easy to design and maintain | Single-sided boards have simple wiring rules and are less difficult to design, making them especially suitable for beginners or small projects. Furthermore, their simple circuitry makes troubleshooting relatively easy and maintenance costs low. |
| Suitable for mass production | For simple circuits produced in large batches, single-sided boards enable rapid and stable production, helping companies shorten delivery cycles. |
Disadvantages of single-sided PCBs
| Circuit complexity limited | Single-sided boards can only accommodate a single layer of wires and cannot allow for cross-wiring, which means they can only meet simple circuit requirements and are difficult to support the implementation of complex functions. |
| Limited performance | Due to limitations in wiring layers, single-sided boards struggle to meet the demands of high-frequency, high-density, and multifunctional circuits. They fall short in applications requiring high performance. |
| Low component density | The single-sided design limits the flexibility of component layout, which is a major drawback in the modern trend of pursuing lightweight and miniaturization in electronic devices. |
| Not suitable for high-end applications | High-end fields such as communication equipment, medical electronics, and aerospace often require multi-layer circuit boards to provide higher functional integration and electromagnetic compatibility. |
Common surface treatment processes for single-sided PCBs
The surface treatment process for single-sided PCBs mainly involves treating the exposed pad surfaces, such as HASL (low cost) or ENIG (higher quality gold fingers), to improve solderability and prevent oxidation. Generally, the following surface treatment processes are commonly used in the manufacture of single-sided PCBs.
Hot air leveling
Hot air leveling, also known as hot air solder leveling, is a process in which molten tin-lead solder is coated onto the surface of a PCB and then leveled (blown) with heated compressed air to form a coating that resists copper oxidation and provides good solderability. During hot air leveling, a copper-tin metallic compound is formed at the interface between the solder and copper, with a thickness of approximately 1 to 2 mil.
Tin-plated
Since all solders are currently tin-based, the tin layer can be compatible with any type of solder, making immersion tin plating a promising technology. However, previous PCBs treated with immersion tin plating were prone to developing tin whiskers, which caused reliability issues during soldering due to whisker and tin migration, thus limiting the adoption of this process. Later, organic additives were added to the immersion tin solution, creating a granular tin layer structure, overcoming the previous problems and providing good thermal stability and solderability. Other treatment processes are less commonly used, with electroplating nickel-gold and electroless palladium plating being more prevalent.
OSP Antioxidant
OSP differs from other surface treatment processes in that it acts as a barrier layer between copper and air. Simply put, OSP chemically grows an organic film on a clean, bare copper surface. This film is oxidation-resistant, heat-shock resistant, and moisture-resistant, protecting the copper surface from further rusting (oxidation or sulfidation, etc.) in normal environments. At the same time, it must be easily and quickly removed by flux during the subsequent high-temperature soldering process to facilitate soldering.
Silver Immersion
Immersion silver plating is a process between OSP (Optical Sealing Plated) and electroless nickel/immersion gold plating, and it is relatively simple and fast. Immersion silver doesn’t coat the PCB with a thick layer of armor; even when exposed to heat, humidity, and pollution, it still provides good electrical performance and maintains good solderability, but it will lose its luster. Because there is no nickel underneath the silver layer, immersion silver does not possess all the good physical strength of electroless nickel/immersion gold plating. Immersion silver is a displacement reaction, resulting in an almost submicron-level pure silver coating. Sometimes, the immersion process also includes some organic matter, mainly to prevent silver corrosion and eliminate silver migration problems. This thin layer of organic matter is generally difficult to measure; analysis shows that the weight of the organic matter is less than 1%.
Chemical palladium plating
The process of electroless palladium plating is similar to that of electroless nickel plating. The main process involves using a reducing agent to reduce palladium ions to palladium on a catalytic surface. The newly formed palladium acts as a catalyst, allowing for the creation of palladium layers of any thickness. The advantages of electroless palladium plating include good weld reliability, thermal stability, and a smooth surface finish.
Electroless nickel/immersion gold plating (also known as chemical gold plating)
Chemical nickel plating/immersion gold plating coats a thick layer of electrically superior nickel-gold alloy onto the copper surface, providing long-term protection for the PCB. Unlike OSP, which merely acts as a rust-preventive barrier, it remains effective and delivers excellent electrical performance throughout the long-term use of the PCB. Furthermore, it possesses environmental tolerance unmatched by other surface treatment processes.
Electroplated nickel-gold (electroplated gold)
Nickel-gold plating is the ancestor of PCB surface treatment processes. It has existed since the advent of PCBs and has gradually evolved into other processes. Nickel-gold plating involves first electroplating a layer of nickel onto the conductors on the PCB surface, followed by electroplating a layer of gold. The nickel plating is mainly to prevent diffusion between gold and copper. Currently, there are two types of nickel-gold plating: soft gold plating (pure gold, the gold surface does not appear shiny) and hard gold plating (smooth and hard surface, wear-resistant, containing cobalt and other elements, the surface appears brighter).
Soft gold is mainly used for wire bonding during chip packaging; hard gold is mainly used for electrical interconnects in non-soldering areas (such as gold fingers). Under normal circumstances, soldering will cause electroplated gold to become brittle, which will shorten its lifespan, so soldering on electroplated gold should be avoided; while electroless nickel/immersion gold plating rarely becomes brittle because the gold is very thin and uniform .
Common application areas of single-sided PCBs
A single-sided PCB refers to a circuit board with conductive circuitry on only one side, while the other side is primarily used for mounting components or providing support. This simple design makes its manufacturing process relatively basic, but it holds an irreplaceable position in the following application areas:
| Consumer electronics | Single-sided PCBs are widely used in consumer electronics products such as radios, calculators, and small household appliances. These products have lower requirements for circuit complexity but need to balance reliability and cost-effectiveness. |
| Lighting industry | In products such as LED lighting fixtures, displays, and backlight modules, single-sided PCBs are highly favored due to their strong thermal conductivity and simple design. |
| Automotive and home appliance industries | In traditional household appliances such as electric toys, rice cookers, and vacuum cleaners, single-sided PCBs are an economical choice. In addition, they are often used in certain non-critical circuits in automobiles, such as door light control modules. |
| Industrial electronic equipment | In small control circuits or simple interface boards where signal processing requirements are not high, single-sided boards can provide stable performance and save costs. |
Single-Sided PCB Manufacturing
single-sided PCB manufacturing is being shaped by cutting-edge technologies and ever-changing market demands. We have summarized and predict that the future of PCB manufacturing will see innovation in the following areas.
| Additive manufacturing (PCB 3D printing) | Additive manufacturing methods do not use subtractive etching; instead, conductive ink is deposited only where needed. This reduces waste, enables rapid prototyping, and allows for embedded components. |
| Embedded components | Passive and active components are being integrated directly into the PCB layer, reducing footprint and improving performance. |
| Smart factories and Industry 4.0 | IoT devices, real-time monitoring, predictive maintenance, and AI-driven analytics are transforming traditional printed circuit board manufacturing into intelligent, responsive operations. |
| Sustainability Initiatives | Water recycling, lead-free processes, biodegradable substrates, and energy-efficient equipment are becoming the standard for environmentally conscious factories. |
| Advanced Materials | New dielectrics with ultra-low Dk/Df values, improved thermal conductivity, and enhanced mechanical strength are being used in next-generation 5G, AI, and autonomous systems. |
Geyuan Electronics ‘ core advantages in PCB custom manufacturing
customers from anywhere are looking for a professional PCB manufacturer , their concerns are always : “Can you do it?”, “How well will you do it?”, and “Can you guarantee the delivery time?”. Geyuan Electronics has many years of experience in the PCB manufacturing field and has built various advantages to better serve global customers. My advantages mainly include the following aspects.
| 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 the technical challenges of multilayer PCBs . For example, our recently developed 40-layer lamination process achieves a yield rate of over 95%, far exceeding the industry average of 70%. |
| DFM analysis services 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. |
| Internal factories and advanced equipment | Our in-house production bases in Shenzhen and Dongguan, China , are equipped with a full range of high-end PCB manufacturing equipment: high-speed drilling rigs imported from Germany, fully automatic laminators, LDI laser exposure machines, AOI optical inspection instruments, TDR impedance testers, X-Ray layer offset testers, etc. All of these equipment were introduced in the last three years and are at the forefront of the industry in terms of performance. |
| Prototype and mass production capabilities | Our PCB production capacity allows us to produce 1,500 prototypes per month and 10,000 square meters of PCBs per month in bulk, 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 management and after-sales capabilities | Our PCB manufacturing yield rate reaches over 98%, far exceeding the industry average of 80%. We have a strict quality control system with 12 inspection checkpoints from raw material warehousing to finished product delivery to ensure that every board is qualified. We also offer a lifetime warranty; any board manufactured by us that is not damaged by human error will be repaired free of charge. |
| Service advantages | 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. |
Summarize
Even in today’s smart era, single-sided PCBs remain an irreplaceable and crucial component of electronics manufacturing. Their low cost, fast turnaround time, and simple design make them widely used in education, entrepreneurship, and consumer electronics. Understanding their manufacturing process, design specifications, and price range will help you undertake projects with greater confidence.
Furthermore, based on Geyuan Electronics’ order and customer feedback, the manufacturing process for single-sided PCBs is becoming increasingly mature, and the demand is growing. Whether in consumer products or other products, single-layer PCBs are increasingly used as core components because they effectively reduce manufacturing complexity and control costs. If you have single-layer PCB manufacturing needs, whether for prototypes or mass production, please contact Geyuan Electronics for assistance. Start your single-sided PCB manufacturing project now! We welcome your design files, and our team will create a high-quality, cost-effective circuit board for you.