Single-sided PCBs: Cheap, but is it smart?

When I choose a single-sided PCB, I am usually trying to keep the design simple and the production cost under control. That choice can work well for a basic circuit. It can also create extra expenses when the board needs more space, more wire links, or repeated redesigns.

The low board price is only one part of the calculation. I also need to review assembly time, enclosure size, repair access, electrical performance, and the cost of future changes.

Where single-sided PCBs make sense

A single-sided PCB has copper traces on one side of the board. Components are normally placed on the other side, although some designs may use through-hole parts or jumpers.

I find this structure useful for products such as:

• Simple LED boards
• Basic relay modules
• Low-cost control panels
• Small power indicator boards
• Simple sensor interfaces
• Educational electronics kits
• Circuits with few components and short signal paths

A single-sided board is easier to inspect. A technician can often follow the copper paths without using special documentation. Repairs may also be easier because the circuit layout is visible from one side.

The manufacturing process can be less demanding than a double-sided design. This may help when the product has a small board area, low circuit density, and stable requirements.

For a simple LED indicator with a few resistors, connectors, and one switch, using two copper layers may add cost without giving the design a useful benefit. A single-sided PCB can meet the electrical needs while keeping the layout easy to understand.

The hidden cost of a low board price

A single-sided PCB may require more board area. When traces cannot cross, I need to route them around other connections. This creates longer paths and may force the board to grow.

A larger board can affect several parts of the product:

• A bigger enclosure
• More plastic or metal material
• Higher shipping weight
• More space required inside the machine
• Longer assembly time
• More difficult cable placement

Jumpers are another common cost. If two traces need to cross, I may add a wire link or a zero-ohm resistor. One jumper is not a major issue. A board with many jumpers can become slower to assemble and harder to inspect.

Manual jumper installation also adds variation. A worker may place the wrong wire length, miss a connection, or create a weak solder joint. Automated assembly becomes less convenient when the design depends on hand-installed parts.

This is where a low PCB quotation can lead to a higher product cost.

A practical example from product development

Imagine a small controller for a ventilation fan. The first version uses a single-sided PCB because the circuit has only a few components. The board price looks attractive.

During layout, the designer finds that several signal paths need to cross. The design then adds eight wire links. The board also becomes wider because the traces need extra routing space.

The result may include:

• A larger plastic housing
• More manual assembly work
• Longer inspection time
• More points that can fail during repair
• Less room for later circuit changes

A double-sided PCB may cost more as a bare board, but it could reduce the board size and remove most of the wire links. If the product is made in larger quantities, the assembly savings may balance the higher board price.

This does not mean a double-sided PCB is always the better choice. It means the board should be judged as part of the full product.

Electrical limits to review

A single-sided layout may work well for low-speed and low-density circuits. I need more care when the design includes fast signals, sensitive analog paths, switching power circuits, or long current loops.

The trace layout can affect:

• Noise between signal paths
• Voltage drop
• Heat around high-current traces
• Ground return paths
• Signal timing
• Electromagnetic emissions

A single copper layer gives me less freedom when I need to create a clean ground path. I may need wider traces, extra routing space, or separate wire connections. These changes can increase the board size and make testing less convenient.

For a small battery-powered alarm, the limits may not create a problem. For a compact motor controller or a mixed-signal measurement device, the layout needs closer review before the board type is selected.

How I compare the real cost

I use a simple cost check before making the decision.

Board price

I request quotes for both single-sided and double-sided versions. I compare the same material, thickness, finish, quantity, and delivery requirements.

Board size

I measure the area needed by each layout. A larger board may affect the enclosure and the amount of material used elsewhere.

Assembly work

I count jumpers, hand-soldered parts, extra connectors, and manual inspection steps. These costs can exceed the difference between two board quotations.

Testing and repair

I ask how easily a technician can test the circuit. A simple layout with fewer jumpers may reduce troubleshooting time.

Future changes

I review the product roadmap. If new sensors, connectors, or control features may be added, a single-sided layout may leave little room for change.

Production quantity

A small batch may favor a simple board with easy manual assembly. A larger production run may benefit from a denser design that supports more automated assembly.

Questions I ask before selecting the board type

I ask myself:

• Does the circuit have many trace crossings?
• Will jumpers be needed?
• Can the board fit inside the planned enclosure?
• Are high-current or sensitive signals present?
• Will the product need changes later?
• Can the assembly line handle manual wire links?
• Will repair staff understand the layout easily?
• Does the board need a clean ground return?

If most answers point to a low-density circuit, a single-sided PCB may be a sensible option. If the design needs many workarounds, the low board price may not reflect the total cost.

My view

I do not treat single-sided PCBs as a cheap substitute by default. I see them as a useful option for circuits that match their limits.

They work best when the circuit is simple, the board area is not tightly restricted, the signal requirements are modest, and manual assembly remains manageable. They become less attractive when jumpers multiply, the enclosure is compact, or the product needs room for future updates.

The right choice comes from comparing the whole manufacturing process, not just the bare PCB quotation. A slightly higher board cost can support a smaller product, faster assembly, and easier testing. A single-sided design can still be the better choice when it keeps the circuit clear and avoids unnecessary layers.

When I compare PCB quotes, a single-sided board often looks like the easy choice. The price is low, the design appears simple, and the production process is familiar. That can make it attractive for prototypes, basic control boards, LED products, and small electronic devices.

The low quote does not tell the whole story. A single-sided PCB can save money when the circuit matches its limits. It can also create extra design work, larger board dimensions, or assembly problems when the circuit needs more routing space.

The real question is not whether a single-sided PCB is cheap. The better question is whether it fits the product.

Where a single-sided PCB works well

A single-sided PCB has copper traces on one side of the board. Components are usually placed on the other side, depending on the assembly method. The structure is simple, which helps keep material and processing costs under control.

I would consider this board type for products such as:

• LED lighting boards
• Simple sensor circuits
• Basic relay or switch boards
• Small power control units
• Educational electronics kits
• Low-speed audio or control circuits
• Simple battery holders and indicator boards
• Products with a low component count

A basic LED sign is a useful example. If the LEDs, resistors, and power connector can be connected with short traces on one copper layer, a single-sided PCB may provide enough space and electrical performance.

The design also becomes easier to inspect. A technician can follow most traces from one side without checking vias or hidden copper layers.

The main cost advantage

The board itself may cost less because it uses fewer copper layers and a simpler manufacturing process. The design may also need fewer vias, and some assembly steps can be easier to manage.

For a small batch, the difference may not be large enough to decide the whole project. Setup charges, drilling, soldering, testing, shipping, and component prices still affect the total cost.

I always compare the full project cost rather than the bare PCB quote:

• Board fabrication
• Surface finish
• Component placement
• Soldering
• Testing
• Rework
• Packaging
• Shipping
• Engineering time

A single-sided board that saves a small amount per piece may require a larger outline. If the board becomes 30% larger, the enclosure may need changes. A low board price can then lead to higher mechanical and assembly costs.

Design limits to check

The biggest concern is routing space. A single copper layer gives every signal trace the same routing surface. Traces may need to cross each other, and a designer cannot solve every crossing with a second copper layer.

There are several common solutions:

• Move components to create shorter paths
• Use jumper wires
• Add wire links
• Increase the board size
• Change the component layout
• Reduce trace width where the design allows it
• Use a two-sided PCB

Jumper wires can solve a routing problem, but they add manual work. They may also create a point that can loosen during vibration or service. For a product made in large quantities, manual wire installation can cost more than using a two-sided board.

Trace width also needs attention. Power traces carry more current than signal traces. A narrow trace may heat up, create voltage drop, or fail under continuous load. I use a PCB trace width calculator and confirm the result with the board manufacturer before releasing the design.

Electrical performance matters

A single-sided PCB can work well for low-speed circuits. It may be less suitable for products that contain high-speed signals, wireless functions, sensitive analog inputs, or tightly controlled power paths.

A second layer can provide more routing freedom and a better ground path. It can also make it easier to separate noisy power sections from sensitive signal areas.

This does not mean every high-speed board needs many layers. It means the board structure should match the signal requirements. A simple temperature sensor may work on one layer. A wireless communication module may need a different layout approach, especially around its antenna and ground area.

Assembly can change the result

Component placement affects the real cost. A single-sided board may be easy to solder when all parts use through-hole packages. It may be less convenient when the design uses many surface-mount components on one side.

Before selecting the board type, I check:

• Which side holds the components
• Whether the assembly line supports that layout
• Whether wave soldering or reflow soldering will be used
• Whether hand soldering is required
• Whether connectors need extra mechanical support
• Whether inspection can reach every solder joint

For a small prototype, hand soldering may be acceptable. For a larger production run, repeated manual work can reduce consistency and raise labor costs.

A practical cost example

Imagine a small controller with ten resistors, four capacitors, two transistors, one connector, and several indicator LEDs.

A single-sided PCB may be a good match if the circuit runs at low speed and the parts can be arranged without long crossing traces. The board may stay compact, and assembly may remain simple.

Now imagine the same controller needs a display, a microcontroller, a switching power supply, and a communication module. The circuit may still be forced onto one layer, but the layout could become larger and harder to inspect. Jumper wires or manual modifications may appear. In that case, a two-sided PCB could reduce the total production effort even if its unit price is higher.

The right choice depends on the finished product, not only on the board quotation.

Questions I ask before choosing

I use a short review process before approving a single-sided design:

1. Can every connection be routed without unsafe trace spacing?

2. Are power traces wide enough for the expected current?

3. Does the board need jumpers or wire links?

4. Will the final board fit inside the enclosure?

5. Can the assembly method handle the component placement?

6. Does the circuit include high-speed, radio, or sensitive analog signals?

7. Is the board easy to test and repair?

8. Will manual assembly create extra labor?

9. Does the supplier support the chosen material, thickness, finish, and hole size?

10. Has the complete product cost been compared with a two-sided option?

I also request a design-for-manufacturing review from the PCB supplier. This can reveal problems with drill sizes, clearances, solder mask, panelization, and component spacing before production begins.

When a two-sided PCB may be the better value

A two-sided PCB may make more sense when the board needs:

• A compact outline
• Many signal connections
• A ground area
• More stable power routing
• Fewer jumper wires
• Automated assembly
• Higher component density
• Easier future updates

The extra board cost may be balanced by lower assembly time and fewer design compromises. It can also leave more room for product changes.

I have found that the cheapest board is not always the lowest-cost solution. Engineering time, assembly work, repair rates, and product size can affect the budget more than the PCB price.

My view

Cheap single-sided PCBs are worth using when the circuit is simple, the current is controlled, the layout has enough space, and the assembly process is clear. They are a practical option for many basic electronic products.

They become less attractive when the design needs many crossings, tight signal control, a small enclosure, or automated production. A two-sided board may carry a higher unit price while reducing work across the rest of the project.

I would choose the board structure after reviewing routing, assembly, testing, and the full product cost. A low PCB quote is useful, but it should be one part of the decision rather than the only reason to select the design.

When I choose a PCB for a small electronic product, I usually look at cost, assembly time, reliability, and future upgrades together. A single-sided PCB can reduce the board price and simplify production, yet it may create layout limits that affect the rest of the design.

The right choice depends on the circuit, not only the quotation.

What is a single-sided PCB?

A single-sided PCB has copper traces on one side of the board. Components are usually placed on the opposite side, though some parts can share the copper side in certain designs.

This structure is simple and easy to understand. It is often used for:

• LED lighting boards
• Basic power control circuits
• Small relay boards
• Simple audio circuits
• Low-cost consumer devices
• Educational electronics kits
• Small sensor products with limited connections

The board has fewer copper layers than a double-sided PCB, so the routing space is smaller. That difference shapes the whole design process.

Why can a single-sided PCB cost less?

A single-sided board may need less material, fewer processing steps, and simpler production equipment. The actual price still depends on board size, order quantity, surface finish, copper thickness, hole count, and manufacturing location.

A simple board with a small number of components can benefit from this structure. For example, a basic LED controller may only need a power input, a resistor network, a switch, and a few output traces. A single copper layer may handle the connections without much difficulty.

The saving becomes less attractive when the design needs many jump wires, manual soldering steps, or extra assembly work. A low board price does not always produce a low total product cost.

I look at the full production flow:

1. PCB fabrication
2. Component placement
3. Soldering
4. Inspection
5. Testing
6. Repair and rework

A single-sided PCB works best when the whole process stays simple.

The main trade-off: limited routing space

Routing is the biggest design challenge.

On a double-sided board, a trace can move around a component or cross to another copper layer through a via. A single-sided PCB does not provide the same freedom. When two traces need to cross, the designer may need to:

• Change the component position
• Reroute the circuit
• Use a wire jumper
• Increase the board size
• Replace a component package
• Split the circuit into separate sections

Wire jumpers can solve a layout problem, but they add manual work. They can affect appearance, assembly speed, and inspection. They may create another point that needs checking during production.

A useful example is a small power supply board. The low-voltage control section may fit easily on one copper side. Once the design adds several connectors, a fuse, a relay, and a protection circuit, the traces may become crowded. The designer then has to choose between a larger board, jumper wires, or a double-sided PCB.

Heat and current need careful planning

A copper trace carries electrical current and produces heat. The required trace width depends on current, copper thickness, acceptable temperature rise, and trace length.

I do not treat a single-sided PCB as a problem for every power circuit. A short, wide trace can work well for a low-current path. A high-current path may need more copper area, a thicker board finish, or a different PCB structure.

The design should leave enough space around:

• Power input terminals
• Fuses
• Regulators
• Relays
• High-temperature components
• Heat-producing resistors

Thermal design matters even when the circuit is electrically simple. A crowded board can make testing and repair harder.

Component placement affects the cost

Single-sided PCBs often work better with through-hole components, especially in simple products. These parts are easy to inspect and can be suitable for hand assembly or basic production lines.

Surface-mount components can fit on compact boards, but their placement may require a more controlled assembly process. The best package depends on production volume, equipment, repair needs, and component availability.

I usually place the parts by function:

• Power input near the protection section
• Control parts near the signal source
• Output parts near the connectors
• Heat-producing parts away from sensitive components
• Test points where a technician can reach them

Good placement can reduce trace length and limit the need for jumpers. It can also make fault finding easier after assembly.

When a single-sided PCB is a sensible choice

This board type may suit a product when:

• The circuit is electrically simple
• The current load is modest
• The board has enough physical space
• Manual assembly is acceptable
• The product does not need frequent circuit changes
• The design can use a few wire jumpers
• Testing access is easy to provide

A small temperature indicator is one practical example. The circuit may contain a sensor, a control device, a few resistors, an LED display, and a power connector. If the connections remain simple, a single-sided layout can be easy to produce and repair.

A compact wireless device, a dense motor controller, or a board with many signal lines may need a double-sided design from the start.

A design check I use before ordering

I review the PCB files and ask several questions:

1. Can every connection be routed on one copper side?
2. Will any jumper wires be needed?
3. Are the power traces wide enough for the expected load?
4. Can the manufacturer produce the selected hole sizes?
5. Is there enough clearance around pads and traces?
6. Can the assembly team place and inspect the components?
7. Can a technician reach the test points?
8. Will the board still work if the product needs a small future change?

I send the manufacturer the Gerber files, drill files, board dimensions, copper thickness, surface finish, and assembly notes. I ask for a design-for-manufacturing review when the layout is close to the supplier’s process limits.

The manufacturer’s minimum trace width and spacing should guide the design. A layout that works on screen may require changes after production review.

Single-sided versus double-sided PCB

A single-sided PCB offers a simpler structure and may reduce fabrication cost. It can be easy to inspect and suitable for basic products.

A double-sided PCB provides more routing space. It can reduce board size, remove some jumper wires, and support more complex circuits. The board may cost more, but the assembly process can become easier when the design is dense.

I compare the two options by total project cost rather than board price alone. A single-sided board with several jumpers may require extra labor. A slightly higher-cost double-sided board may reduce manual work and improve consistency.

The best decision comes from matching the PCB structure to the circuit and production method. Choose single-sided construction when the layout is simple, the current is controlled, and the assembly plan supports it. Select a double-sided PCB when routing, heat, size, or future changes place too much pressure on one copper layer.

A low price can feel like a smart choice when I am trying to control my budget. The problem starts when the cheaper option creates extra costs, wasted time, or poor results later.

A higher price does not always mean better value either. The right decision depends on how well the product or service fits my needs, how long I expect to use it, and what I may need to pay after the purchase.

The real question is not, “Which option costs less today?”

It is, “Which option gives me a reasonable result for the money I spend?”

Look beyond the listed price

I check the full cost before making a decision.

That may include:

• Delivery fees
• Installation
• Replacement parts
• Software or service fees
• Repairs
• Training
• Maintenance
• Time spent solving problems

A printer is a simple example. One model may have a low purchase price, while its ink cartridges cost more and run out often. Another model may cost more at the start but use less ink for regular printing.

The cheaper printer may still suit someone who prints only a few pages each month. It may not suit a small office that prints contracts, invoices, and product labels every day.

Match the choice to real use

I ask myself how often I will use the product and what result I expect from it.

A basic office chair may work for short periods at a shared desk. Someone who works from home for eight hours a day may need better support and adjustable features. Paying more for a suitable chair could reduce the need to replace it after a short period.

The same idea applies to phones, laptops, tools, clothing, and business services. A product with extra features is not automatically a good purchase. If I never use those features, I am paying for something that does not solve my problem.

Check the details before buying

Clear product information helps me avoid an unsuitable choice.

I look for:

• Product size and materials
• Compatibility with my current equipment
• Return conditions
• Warranty coverage
• Repair options
• Delivery time
• Customer support
• Reviews from people with similar needs

I pay attention to repeated comments instead of relying on one review. A complaint about slow delivery may not matter to me if I can wait. Reports of poor build quality may matter more if I need the product for daily work.

I also check whether reviews describe long-term use. A product can look good after one week and become less useful after several months.

Separate useful features from sales language

Some descriptions sound attractive but do not explain how the product helps me. I focus on clear facts.

Instead of asking whether a product is called “premium,” I ask:

• What materials are used?
• How does it perform in normal use?
• What problem does it solve?
• What limits should I know about?
• Can I maintain it without special equipment?

This approach keeps my decision connected to my needs. It also makes it easier to compare two products without being guided only by appearance or emotional wording.

Consider the cost of a poor fit

A low-cost purchase can become expensive when it does not work for my situation.

A small design studio once chose a budget printer to reduce office expenses. The printer met basic needs, but the team soon faced slow printing, frequent cartridge replacement, and limited paper handling. The staff spent time ordering supplies and fixing print errors. The original price was low, yet the total cost included lost working hours and repeated purchases.

The lesson is not that budget products are always a bad choice. The studio needed to compare the printer with its daily workload before buying it.

A home user with light printing needs might have been satisfied with the same model.

Use a simple decision test

Before I buy, I write down three points:

1. What problem am I trying to solve?
2. How often will I use the product or service?
3. What costs may appear after purchase?

Then I compare two or three suitable options. I do not compare every product on the market. Too many choices can make a simple decision harder.

I also set a practical budget range. The lowest price may not fit my needs, while the highest price may include features I will not use. A middle option can be sensible when it offers the functions I need, clear support, and manageable future costs.

Make room for changing needs

My needs may change over time. A product that fits me now may not fit my work six months later.

If I am buying equipment for a growing business, I check whether it can handle a moderate increase in use. If I am buying for temporary personal use, long-term capacity may not matter as much.

This does not mean paying extra for every possible future need. It means avoiding a choice that is clearly too limited for the way I plan to use it.

A smart purchase gives me a fair balance between price, performance, support, and expected use. A costly compromise often begins when I choose based only on the amount shown at checkout.

I do not need the most expensive option. I need an option that solves my actual problem without creating avoidable costs later.

Contact us today to learn more lingchao: mr.xu@lingchaopcb.com/WhatsApp +8613780181891.

1. IPC 2012 Generic Standard on Printed Board Design

2. IPC 2009 Standard for Determining Current Carrying Capacity in Printed Board Design

3. Clyde F. Coombs Jr. and Happy T. Holden 2016 Printed Circuits Handbook

4. Paul Horowitz and Winfield Hill 2015 The Art of Electronics

5. John Watson 2020 PCB Design for Real-World Applications

6. Mark I. Montrose 2000 EMC and the Printed Circuit Board Design Theory and Layout Made Simple