16+ Years in PCB Assembly in China

  • SMT assembly, PTH assembly, SMT+PTH mixed
  • PCB Fabrication, Component Sourcing & Turnkey PCB Assembly
  • SOIC, QFP, QFN, BGA, uBGA, CGA, LGA, CSP, Components as small as 0201
  • IC Programming & PCBA Testing
  • ISO9001:2015, ISO 13485:2016 Certified & UL Listed
  • 100% AOI, X-RAY, ICT & FCT
  • No MOQ & Competitive Pricing

What is PCB Assembly?

PCB assembly is short for printed circuit board assembly, which means soldering electronic components on the printed circuit board. Usually, both SMT assembly and PTH assembly are used in a completed electronic PCB assembly. Here, we would like to introduce a little about SMT assemblies, PTH assemblies and other methods of PCB assembly services as a Chinese PCB assembly supplier.

SMT assembly is short for surface mount technology assembly, which means assembling electronic components on the PCB by surface mount technology. The normal processes of SMT assembly are printing solder paste on the printed circuit board by solder stencil first; then placing the relative components on the surface of the PCB; and lastly, passing the PCB with components through a reflow soldering oven, so the solder paste will be melted and the components will be soldered. It is the most widely used PCB assembly services method because of its high efficiency and accuracy.

PTH assembly is short for plated through hole assembly, which means soldering the electronic components on the PCB by soldering their pins in the PTH holes. Both wave soldering and manually soldering can be used in printed circuit board assembly. The normal processes for PTH assembly are: plugging the pins of the PCB components into the through holes of the PTH firstly and then passing the PCBs through the wave soldering equipment with hot liquid solder; lastly the components are soldered in the PTH holes when the solder is cooled down. It is the other most widely used PCB assembly services technology.

Although SMT assembly and PTH assembly are the two most essential methods used by printed circuit board assembly suppliers, we can also just solder the PTH components on the PCB manually with a soldering iron; this is the third most commonly used PCB assembling method. But it is impossible for mass production since the efficiency of manual printed circuit board assembly is very low.

Nowadays, one single PCB board assembly may contain all mixed PCB assembly technology, so PCB assembly companies should be experienced in all these techniques. Viasion is a custom PCB assembly manufacturer in China, and we are pretty experienced in all kinds of PCB assembly methods. We focus on small to medium-volume PCB manufacturing and PCB assembly China with 16 years of experience. Our factory is ISO9001, ISO13485 and UL certified.

PCB assembly services China

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    Our PCB Assembly Capabilities

    • Surface Mount (SMT) assembly
    • Thru-hole (PTH) assembly
    • Mixed Technology (SMT & Thru-hole)
    • Single or double-sided placement
    • Rigid, Flexible PCB and Rigid-flex PCB Assembly
    • High pin count press fit capable
    • Manual printed circuit assembly
    • Kitted/Consigned
    • Partial Turnkey
    • Turnkey PCB Components sourcing
    • Passive Components as small as 0201
    • Ball Grid Arrays (BGA) as small as .35mm pitch
    • BGA, uBGA, QFN, DFN, SOP, PLCC, POP, CGA, CSP and Leadless chips
    • All kinds of passive and active components
    • Reels
    • Cut tape
    • Tube and tray
    • Loose parts and bulk

    Smallest size: 0.2" x 0.2"
    Largest size: 20'' x 28"

    • AOI (Automated Optical Inspection)
    • X-ray for BGA
    • ICT (In-circuit Test)
    • FCT (Functional Test)
    • E-test
    • Manual visual inspection
    • Burn-in test
    • No minimum order quantity
    • Engineering prototypes
    • Low-cost first article
    • Small series production
    • Mass production
    • 1 week for Consignment PCB assembly
    • 2-4 weeks for turnkey PCB assembly
    • Low-cost first article
    • 4-10 weeks for full turnkey box build assembly
    • Quick turn available
    • Box Build Assembly
    • IC Programming, System Integration
    • Conformal coating
    • Mechanical Assembly
    • Electromechanical Assembly
    • Cable and Wire Harness Assembly
    • Repair/Rework services
    • DFM Analysis

    Viasion- Reliable PCB Assembly Manufacturers in China

    Viasion Technology is one of the best PCB assembly manufacturers in China. Since 2007, we have supplied low-medium volume PCB assembly services, including PCB fabrication and components sourcing. We always supply printed circuit board assembly with high quality and affordable prices. Besides, we are a reliable one stop PCB assembly company and fully flexible to meet any requirement from our customers. These are why Viasion has gained the recognition and trust of many customers worldwide.

    1
    16 Years of Experience

    Viasion has been supplying top-quality PCB assembly services for 16 years. With our decades of engineering and production experience in the printed circuit board assembly industry, we can always foresee and avoid possible issues before starting manufacturing and then fabricate and assemble PCBs correctly the first time. We are a reliable PCB assembly China. 

    2
    High-Quality PCB assembly

    Our company attaches great importance to the quality of PCB assembly. It has established a strict quality control system for printed circuit board assembly, from checking raw materials, the manufacturing process, and quality inspection to operating the production equipment to carry out comprehensive control in PCB assembling. Furthermore, Viasion has the following certifications for PCB assembly service: ISO 9001:2015, ISO 13485:2016, ISO 14001:2015, UL E358677, RoHS/REACH compliance, which is helpful for us in ensuring high quality PCB assembly. These certifications proves we are one of the trusted printed circuit board assembly suppliers.

    3
    Competitive Price

    Through our relentless efforts to increase yield rate and PCB assembly service production proficiency, we can provide low-cost PCB manufacturing and the best PCB assembly services in our company. We try to think out various methods to reduce the cost but always stick to the high-quality standard since the management of quality and cost are both equally essential. We provide the most competitive PCB assembly China.

    4
    99% Customer Satisfaction

    As a PCBA supplier, we are so proud that there are 99% positive comments from customers about our printed circuit assembly. Our company has won the trust and praise of many customers for our high-quality China PCB assembly, competitive and reasonable prices, and excellent after-sales service.

    Benefits of PCB Assemblies

    The core part of all electronic products is composed of printed circuit board assembly; all the functions can not be realized without PCBA circuit board. Therefore, PCBA is the basic unit of all functions in the electronics industry. In other words, PCB assembly services is the most important component of all electronic product components, similar to the human body’s neural network. The life span, operating speed, reliability, and stability of general consumer electronics are most directly related to PCBA circuit board. It is no exaggeration to say that the quality of PCBA is also the most direct determinant of the overall quality of electronic products. Outsourcing your projects to a reliable Chinese PCB assembly company for high-quality and competitive princes is very beneficial.

    Stated roughly, the important functions of printed circuit board assembly are described below.

    • PCB assembly services support for the soldering and fixing of various electronic components.
    • PCB assembly services provide electrical connection or insulation between various components.
    • PCB assembly services ensure the welding quality of all kinds of components and quickly improve the efficiency of maintenance.
    • PCB assembly services Provide the electrical characteristics, electromagnetic compatibility, and characteristic impedance required by the circuit in high-speed and high-frequency circuits.

    How to Order China PCB Assembly Service on Viasion?

    Viasion is a trusted PCB assembly China with high-quality and low-cost products. If you need to order printed circuit board assembly service on Viasion, please contact our salesmen, whose contact information (phone number & email address) is listed on our official website: Contact Us- Viasion Technology Co. Ltd. Our sales personnel will communicate with you kindly to deal with your order. We are one of China’s most trusted printed circuit board assembly suppliers.

    After you place an PCB assembly service order and send the files we need including Gerber files, BOM (bill of material) lists, Pick & Place files with the X/Y coordinates, drawings of the assembled PCBs, etc., our salespersons will properly keep the documents you send and then forward them to our engineers for processing. They will ensure that your order goes smoothly, as well as keep you informed of the various details of our cooperation.

    After the order is placed in our PCB assembly company, our sales staff will also keep in close contact with you to give feedback on the order. In short, we will try our best to provide you with attentive and considerate services so that you can be free from worries. 

    Please get in touch with our sales team freely when you want to find a trusted PCB assembly company in China. And we are looking forward to serving you.

    PCB Assembly Process--8 main steps

    PCB assembly process seems to be very simple compared with PCB fabrication if we do not dig into the details just considering SMT assembly and PTH assembly. But in fact, there are a lot of small steps and supportive processes regarding the details of the printed circuit assembly. 

    Step 1: Prepare files needed in PCB assembly

    Firstly, we need to prepare the files needed for PCB board assembly, including DFA check about Gerber, BOM files, and general production files which our equipment and personnel can use in circuit card assembly. This is the first and very important process in PCB assembly service.

    Step 2: SMT assembly

    When we prepare all of the documents, fixtures, or any supportive material, we can start the most important process in printed circuit board assembly now: SMT assembly. Here we would like to introduce the detailed processes in custom PCB board assembly services.

    Step 3: PTH assembly

    PTH assembly means plated through hole assembly. It is another main step of printed circuit board assembly. The components are soldered on the PCB by soldering the components pins in the PTH of the PCB. Normally, there are four steps:

    1
    Prepare Tooling Fixture

    In most PCB assembly service cases, tooling fixtures are needed as a carrier of PCB in the PTH assembly process. Because only the parts with PTH pins need to be soldered, other parts should be covered by the fixture. Besides, some components are very heavy, so the fixture will be helpful to withstand the weight when running through the waving soldering machine, to avoid the PCB being bent because of heat. So tooling fixtures are very important to get high quality PCB assembly. With sufficient support from fixture producers, China PCB assembly manufacturer can always prepare the tools in time. 

    2
    Insert the Component Pins into the PCB Holes

    In this step, we will need to insert the component pins into the PCB holes. It can be done manually and automatically. But due to the variety of PTH assemblies, fully automatic PTH assembly seems to be impossible, especially for prototype printed circuit board assembly and small-volume printed circuit board assembly. In the same cases, the pins of PTH components need to be formed in a certain shape, since it is impossible to be done after wave soldering. PTH assembly is still commonly seen in PCB assembly China.

    3
    Run Through Wave Soldering

    In PCB assembly services, when all the components are properly inserted into the PCB holes, it is time for the PCBs to run through the waving soldering printed circuit board assembly. Why is it called waving soldering? Because after adding enough heat, the tin in the solder stove will spray upward like a “wave”, and the tin will stick on the component pins and run through the PCB holes when the PCB runs through the “wave”. Wave soldering seems to be easy, but still, experienced engineers are needed to set the temperature and speed for different circuit card assembly projects. With the development of wave soldering technology, selective wave soldering is commonly used in PCBA China to have better and cleaner solder joints.

    4
    Cut Extra Pins

    There are always long pins existing on the PCB after PTH soldering, which will affect the usage of customers. So PCB assembly supplier need to cut the extra pins after PCB assembling. At the same time, the PCBs look much more beautiful without long pins. Automatic pin-cutting machines are used in mass production PCB board assembly to save time and cost in PCB assembly China. 

    5
    Quality Inspection

    Quality inspection is always critical for all printed circuit board assembly suppliers. Since we have already done a quality inspection for SMT printed circuit board assembly, here we just need to inspect the quality for PTH assembly to prevent wrong components, failure solder joints, shorts, etc., and to guarantee good quality of pcb assembly board services. With our decades of experience, we can consistently deliver error-free PCB assembly in China and supply the best PCB assembly service to customers worldwide.

    Stemp 4: Manual assembly

    Manual assembly means that the electronic components are soldered by hand in PCB assembly services. First, we turn on the soldering iron and let the iron head temperature reach 300-400 Celsius degrees, and then place the component in the correct place. Lastly, melt the tin wire and solder the component on the PCB. The quality of manual assembly highly depends on the skill and experience of the worker, and the deficiency is also low compared with PCBA manufacturing by machine. Viasion can supply manual assembly PCB China.

    Manual assembly is not a must in circuit board assembly services. Most printed circuit board assembly will be finished after SMT assembly and PTH assembly. Because there are some disadvantages as follows:

    The disadvantages for manual assembly

    In manual assembly, we need to solder each component one by one, so the PCB assembling efficiency of printed circuit board assembly is low. That is why manual assembly is not suitable for high-volume electronic PCB assembly. So, manual assembly is not commonly used by big PCBA suppliers.

    As we all know, the efficiency of manual soldering is low, so it is obvious that the unit cost for every single printed circuit assembly is high. So it is not suitable for mass production PCB board assembly. But for prototype production, the overall cost is even cheaper since no tooling fixture is needed, and no need to use wave soldering equipment. Viasion is a China PCB assembly comany with competive pricing  for SMT, PTH and manual assembly.

    The quality of manual assembly highly depends on the skill of the worker. So very skilled workers are needed to get good quality soldering. Of course, this is also the reason why the cost of manual assembly is higher than wave soldering printed circuit board assembly.

    Why manual assembly is needed in PCBA

    Although manual assembly has many disadvantages, and we can assemble our PCBs and components by reflow soldering and wave soldering, why is manual assembly still needed in printed circuit board assembly? As a highly experienced supplier of PCB assembly China, we think the main reasons are as follows:

    Some special components cannot be done by reflow soldering and wave soldering equipment in printed circuit assembly. For example, sometimes cables or wires need to be soldered on the pads of the PCB; a PCBA supplier can not do this with a machine. The best way is to solder them one by one by a human in PCBA circuit board.

    In some quite simple prototype production, PCB assembly supplier can solder the PTH components manually rather than pay extra costs for the tooling fixture. It will be helpful to save printed circuit board assembly cost for our customer.

    In PTH assembly, we always need to prepare the tooling fixture first before starting the PCB assembly service, it may take more than one day. Besides, adjustment of wave soldering machines will also take a lot of time. But for printed circuit board assembly suppliers, every day counts for a quick turn prototype. Using manual soldering, we can finish the assembly faster than waving soldering and deliver goods to the customer earlier to meet the quick turn PCBA manufacturing requirement.

    Step 5: Functional Testing

    When all the components are assembled on the PCB, PCB assembly company will do functional testing (FCT) if required by customers. A testing fixture is always needed to test the assembly of printed circuit boards, and it can be supplied by customers or we can produce it according to the customer’s testing process and instructions.

    Sometimes, a program or firmware needs to be written in the memory chips before functional testing. If the printed circuit board PCBA pass the functional testing, we are sure the printed circuit assembly is functionally acceptable.

    We should know that some functions can only be best tested by when loading the assembled PCB in the equipment after PCB assembling. We highly recommend performing function tests to get an error-free PCBA in China.

    Step 6: FQC

    FQC means final quality control, which is the last process for PCB board assembly quality control. In this process, our quality inspector will check if there is any defect in printed circuit board assembly. When the electronic PCB assembly passes FQC, it means the product is perfect and ready to ship out.

    Viasion is one of the best PCB assembly China that focus on small to medium volume production. And we have very experienced workers to do final quality control ensuring the delivery of high-quality pcba assembly services to our customers.

    Step 7: Labeling

    Sometimes, when PCB assembly services are finishsed, customers need us to print and stick labels on the PCB as their requirements, such as part number, and QR code. Or the mark needs to be engraved on the PCB by laser. We can do all of these as per customers’ requirements.

    These labels are always used to trace each printed circuit board assembly. Then the customer can use them directly in their devices after receiving the PCBs.

    Step 8: Packaging

    Since we started PCBA China with overseas customers in 2007, we understand how important it is to pack the printed circuit board assembly in good condition to avoid damage during transportation.

    Usually after PCB assembly service is finished, we will seal the single PCBs in individual ESD bags, and then surround them with bubble tapes as buffers. Only robust cartons will be used, and all 6 sides will be filled with thick foam.

    With such robust packages, our PCBs can always be protected in good condition, no matter if it is a one week delivery by air, or one month delivery by sea, to ensure high quality PCB assembly arrives at customers' locations perfectly.

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    Differences between Reflow Soldering and Wave Soldering

    Reflow soldering and wave soldering and 2 most important and normally used electronic PCB assembly technology in PCBA manufacturing. Some people may be confused about them, then how to distinguish them? Here are the main differences between the two most widely used PCB assembling methods by PCBA suppliers:

    Different types of components used by PCB assembly company

    Different equipment and processes

    Different types of solder are used by PCB assembly company

    Differences between PCB and PCB Assembly

    Consigned PCB Assembly & Turnkey PCB Assembly

    Normally Used Components in PCB board assembly

    A fully functional PCB contains printed circuit boards and electronics. We know that there are many types of PCBs, and there are many types of components as well in assembly of printed circuit boards. Here is the basic introduction to normally used electronic components in circuit card assembly.
    There are many more types of components used in electronic devices and PCB assembly service. Here we just introduce the types which are most normally used in most printed circuit board assembly of electronic products. We always use the best quality components for the best PCB assembly service.

    When the currency runs through the conduct, there will be resistance. The resistor is specially designed to increase the resistance, it is used to limit the current in the circuit, to make sure other components can work stably with the required currency. So resistors are critical components of printed circuit board assembly.

    In the BOM list, resistors always start with an “R”, so we can easily recognize where one re resistors. Most of the resistors are very cheap, except for some special types or the ones with an extremely small tolerance. Resistors exist in almost every printed circuit assembly. 

    We can simply regard capacitors as electricity containers. Capacitors are widely used in electronics, and there are many types of capacitors, such as ceramic capacitors, aluminum electrolytic capacitors, tantalum electrolytic capacitors, film capacitors, polymer capacitors, silver mica capacitors, glass capacitors, supercapacitors etc.

    In the BOM list, capacitors always start with a “C”, it is also easy to recognize in the BOM.  Capacitors exist in almost every printed circuit assembly. Most ceramic capacitors and aluminum electrolytic capacitors are not expensive, but some special capacitors are very expensive. So, we need to pay attention when quoting PCB assembly service costs.

    The diode has two electrodes but only allows the currency to pass through from one direction. There are many different types of diodes, such as crystal diodes, zener diodes, varactor diodes, light-emitting diodes, rectifier diodes, schottky Diodes, etc.

    The diode is also one of the three most widely used components in printed circuit board assembly, together with Resistors and capacitors.

    Generally speaking, an inductor is a coil. The coil is made of insulated wire (used copper) wound on a frame. The inductor can form magnetic field induction when electricity runs through the coil. Inductors are common in PC board assembly.

    Inductors can be classified according to if it is fixed value or variable value, Core material, the method in wire wounding, usage, etc. Field Effect Transistor (FET) is the most widely used type among them.

    Transistor is used as a switch and amplifier, it can control and adjust the signal of electronic devices. It is also commonly used in PC board assembly.

    There are many different types of transistors according to their structure, function, power, frequency, and package.

    A sensor is a device used to detect information, such as pressure, color, sound, temperature, humidity, speed, heat, etc, and then pass such information to the processor as electronic signals. The sensor works just like the organs of the human body.

    There are many different types of sensors to meet the demand of different applications, such as pressure sensors, thermal sensors, position sensors, speed sensors, acceleration sensors, temperature sensors, humidity, speed, heat sensor, radiation sensor, etc. We must pay attention to prevent sensors from damage during PCB assembly service.

    Connectors are used to connect with wires or cables. Normally female connectors will be soldered on the PCB, and male connectors with cables can be plugged in on the connector easily in usage.

    Small connectors can be designed and soldered as surface mount printed circuit board assembly. But for the big connectors which need to be plugged in and pulled out frequently, it is better to be designed as a PTH assembly, which is more robust.

    The transformer is mainly used to change the currency and voltage, but it also has other functions such as isolation, voltage stabilization, or impedance adjustment.

    Transformers are widely used in power printed circuit board assembly. Normally we can raise or reduce the voltage to fit the demands of electronic devices.

    A relay is a device used to control the electricity connection in the circuit, such as the connection or disconnection, switch, adjustment, etc. The process is automatic and will occur in certain situations. Relay is normally used for circuit production, automatic adjustment, and circuit switching. So, it is very commonly used in power PCB assembly services.

    Relay can be classified according to the technology, dimensions, power, and working principle.

    IC is a very special component since it combines the functions of several types of components in a small device which is very easy to assemble. It is the brain of any printed circuit board assembly.

    There are many more types of components used in electronic devices. Here we just introduce the types which are most normally used in most electronic products.

    Basic Glossary in PCB Assembly

    We can find many glossaries about PCB assembly easily on the internet. Here we would like to share only the very basic ones, with easy-to-understand explanation.

     
    WordDescription
    PCB
    Printed circuit board is the carrier for assembly of the electronic components, then to achieve the electronic functions. It is the base for PCB assembly service.
    PCBA
    Printed circuit board assembly, is alternatively known as PCB assembly. It means the process of assembling the electronic components on the PCB bare board. Normally there are SMT assembly, PTH assembly, and manual assembly.
    Solder paste
    It is a mixture of tin, flux, and water used to be printed on the pads of PCB when doing SMT assembly. In the SMT assembly process, we need to print the solder paste on the PCB surface first, and then let it run through the reflow oven. Then the solder paste will melt and the components will be soldered on the PCB during PCBA circuit board process.
    Pick & Place machine
    It is the machine used to pick out the small SMT components and then place the components in the right place. High speed and high accuracy are needed in printed circuit board assembly, which is why Pick & Place machine is always expensive. The most famous brands of Pick & Place machines are Panasonic, FUJI, SIEMENS, MYDATA, YAMAHA, ASM, Samsung, JUKI, and Universal, which are widely used in PCB assembly China.
    BOM
    BOM is short for bill of material used in PCB assembly services. It is the document to list the components used in printed circuit board assembly, such as component brand, type, parameters, the quality needed, etc. We can know where components need to be placed from the component notation in the BOM.
    Gerber
    It is the most common type of file for PCB fabrication and PCB assembly service. We can see the pattern in all the layers. Together with BOM, these are the two most important files to get PCB fabrication and assembly done.
    Reflow soldering
    It is the printed circuit board assembly process to solder the SMT components on the PCB bare boards. After solder paste printing and components placement, the PCB will run trough a reflow soldering oven to melt the tin. Components will be soldered when the tin is melted and cooled down.
    Wave soldering
    It is the printed circuit board assembly process of PTH components soldering. The tin bar will melt in the solder stove. And the liquid tin will spray up like a wave. Then the pins will be soldered on the PCB when the PCB runs over the tin wave.
    AOI
    AOI is short for automatic optical inspections; it is used to detect printed circuit board assembly defects by optical methods. And relative software will detect solder SMT defects, such as wrong components, fake soldering, and failure soldering. It is used as a substitution for manual inspection since the human will tend to get tired for long hours concentrating and using of eyes. The most outstanding advantage of AOI is the high efficiency in PCB assembly service.
    ICT
    ICT is short for the in-circuit test. It is useful to test failure circuit board assembly by electric connections, such as open, short, wrong components, fake soldering, etc. A testing fixture is always needed in the ICT test in printed circuit board assembly process. 
    FCT
    FCT means functional test. It works to test the electronic functions of the PCB assembly to check if the PCB will perform as designed intentions. A testing fixture is always in functional test. FCT is critical for a PCBA supplier to get an error-free circuit card assembly. 
    X-ray inspection
    We can see the soldering condition for most components with our eyes after PCB assembly. But for BGA assembly, the solder joints are hidden under the BGA, which is impossible to see by the naked eye. Then we use x-ray equipment to defect the possible soldering defects in printed circuit board assembly, such as short, open, voids, connectors, solder balls, etc. So X-ray inspection is widely used by China PCB assembly manufacturers.
    Thank you very much for your attention. Please contact us if you have more questions about PCB manufacturing and assembly.
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    Viasion Technology is your trusted partner & one-stop shop for PCB fabrication, components sourcing, PCB assembly and electronic manufacturing. With more than 16 years of experience, we have been supplying high-quality PCBs with competitive pricing for 1000+ customers worldwide. Our company is ISO9001:2015 Certified & UL Listed, and all our products are 100% E-tested and inspected by AOI & X-RAY to meet the highest industry standards. So please get an instant quote from our sales team now, and we will take care of the rest.

    Frequently Asked Questions

    As mentioned before, PCB assembly means soldering electronic components on the printed circuit board. PCBs and components have their functions, but they can only work as fully functional products after soldering all of them together.

    Definitely“Yes”. We strive to offer our customers quick turnaround PCBA service by all means so that your needs for quick turn PCBA will be satisfied.

    Of course, we can offer multi-layer PCBA services. We can offer any kind of PCB board assembly service according to your expectations and requirements.

    Yes, we offer RoHS-compliant assembly. Viasion strictly sticks to the environmental protection policy. Materials and process operations in Viasion are standardized, taking human health and environmental protection into consideration. Please cooperate with us for ordering products and services without any concern.

    Standard turnaround time varies from the types and the quantity of the PCB assembly. The following are some examples.
    1) Quick turn PCBA service takes 1-5 days.
    2) It takes 1 week for only PCB assembly.
    3) Two to four weeks are taken for turnkey PCB assembly or mass production.
    4) Four to ten weeks are spent on Turnkey box build assembly.

    The following is a brief overview of some of the factors that affect PCB assembly costs.
    1) Technology used: The assembly process may use either surface mount or through-hole technology. Sometimes, certain assemblies may require the use of both technologies, but this can add to the cost.
    2) The number of layers of the board: The cost of a single-sided PCB assembly will usually be lower than the cost of a double-sided or multi-layer PCBA.
    3) The size of the component: Typically, the use of smaller components and the fabrication of densely assembled boards will increase the cost.
    4) The total number of components
    5) Compliance: Multiple tests which are often performed to ensure assembly compliance also add to the cost.
    6) Processes required: Some PCB assemblies may require a series of processes, such as wave soldering, X-ray inspection, automated optical inspection, manual soldering, and other processes. These may significantly increase the cost.
    7) Flexible or rigid PCB assembly: Usually, the cost of flexible PCB assembly is higher than the cost of rigid PCB assembly.
    8) Conformal coating: Costs are also affected by conformal coating requirements. The number of layers of the conformal coating can affect the cost.
    9) Testing: From thermal cycling to circuit testing, many tests are required before shipping the products.
    10) Packaging requirements: Special packaging requirements may result in increased costs.
    Delivery: Costs may increase if expedited delivery times are required.

    Yes! We can handle many types of printed circuit board assembly in a day. All you need to do is just contact our sales representatives and tell them your requirements. We will deal with your order and answer your questions quickly. Above all, if you have any requests or concerns, please contact our sales staff and we are looking forward to serving you.

    Viasion was established in 2007. We have been in the industry of PCB manufacturing for 16 years.

    PCB and PWB refer to the same item which is called differently. PCB is short for printed circuit board while PWB is an abbreviation for printed wiring board. So they are the same without a difference.

    There are many steps involved in the PCBA manufacturing process. In brief, the main steps are as follows.
    Step 1: Adding solder paste: This is the initial stage of the assembly process. In this stage, the solder paste is added to the component pads in all the places where soldering is required. The solder paste is placed on the pads and pasted in the correct position with the help of a solder screen.
    Step 2: Placing components: After adding the solder paste to the component pads, it is time to place the components. The PCB passes through a machine that places these components precisely on the pads. The tension provided by the solder paste holds the components in place.
    Step 3: Reflow soldering: This step is aimed at permanently fixing the components on the board. After placing the components on the board, the PCB passes through the reflow oven conveyor. The controlled heat of the oven melts the solder added in the first step, thus permanently attaching the components to the boards.
    Step 4: Wave Soldering: In this step, the PCB is made to pass through waves of melted solder. This creates an electrical connection between the solder, PCB pads, and component leads.
    Step 5: Cleaning: By this step, all soldering processes are complete. During the soldering process, a large amount of flux residue is formed around the solder joint. As the name implies, this step involves cleaning the flux residue. Flux residue is cleaned with deionized water and solvent. With this step, the PCB assembly is completed. Subsequent steps will ensure that the assembly is completed correctly.
    Step 6: Test: In this stage, the PCB assembly is completed and inspection begins to test the position of the components. This can be performed in two ways.
    1) Manual: This check is usually performed for smaller components. The number of smaller components does not exceed one hundred.
    2) Automatic: This check is performed to check for bad connectors, incorrect components, misplaced components, etc.

    Honestly speaking, there are many devices used to make PCBA and fabricate PCB. The main equipment is listed here.
    In the process of assembling PCBs, the following production equipment is required.
    1) PCB cleaning machine
    2) Solder paste automatic printing machine
    3) Solder paste inspection (SPI) machine
    4) SMT machine
    5) Reflow soldering machine
    6) Wave soldering machine
    7) AOI tester
    The following production equipment is required in the PCB production process.
    1) Film exposure machine
    2) Drilling machine
    3) Laminating machine
    4) Grinding machine
    5) Lamination machine
    6) LDI exposure machine
    7) Etching machine
    8) Silkscreen printing machine
    9) Equipment for surface finish
    10) Punching machine
    11) Electrical measuring machine
    12) V – CUT machine
    13) Flying probe tester
    14) Impedance tester

    There is no minimum order quantity for PCB assembly in Viasion. By the way, Viasion focuses on low-volume to medium volume PCBA service.

    Viasion is located in Shenzhen, China. Shenzhen has outstanding location advantages such as a prosperous economy, a complete manufacturing industry chain, high level of scientific and technological innovation, which means that we can provide you with an efficient one-stop solution for PCB & PCBA relying on the city’s resources.

    As mentioned above, PCB is short for printed circuit board. It is the carrier of electronic components. All the components will be connected by PCB and then achieve electronic functions. PCB assembly is short for printed circuit board assembly. It refers to the process of soldering the components on the PCB. PCBs and components have their functions, but they can only work as fully functional products after soldering all of them together.

    Yes, we do all kinds of tests and inspections in printed circuit board assembly. Inspection and testing services offered by Viasion include:
    1) First Article Inspection
    2) Solder Paste Inspection
    3) AOI (Automated Optical Inspection)
    4) Visual Inspection
    5) X-ray Inspection for BGA
    6) Incoming Quality Control
    7) In-Process Quality Control
    8) Quality Assurance
    9) ICT (In-circuit Testing)
    10) FCT (Functional Testing)
    11) Open/short Testing for PCB
    12) Flying Probe Testing

    Viasion follows IPC guidelines, ISO9001:2015, and RoHS/REACH standards, demonstrating that our company is trustworthy. Undoubtedly, we can offer high-quality products to our customers.

    Firstly, the PCB assembly supplier should have many years of experience. Secondly, a PCB assembly company should have quality certifications like ISO9001, ISO13485, UL, etc. However, we should understand that a trial order to check the quality and service is always very important when selecting a PCB assembly China.

    Yes, Viasion is a one stop PCB assembly supplier in China; we provide complete electronic production services from PCB fabrication to components sourcing and printed circuit assembly.

    As international shipping is so convenient, my assembly PCB China is easy. All the procedures are the same as ordering printed circuit assembly locally. You only need to take into account one week for delivery.

    We can follow these steps to find a reliable PCBA supplier with the best PCB assembly service:
    1) Find 5-10 PCB assembly manufacturers and then check their experiences, certifications and customers’ reviews, and then narrow down to 3;
    2) Send files to the 3 PCBA suppliers to check their prices, and we can know their services after communications;
    3) Choose the best PCBA manufacturer to start a trial order.

    The typical PCBA circuit board processes include SMT assembly, PTH assembly, and manual assembly. But lots of smaller steps, testing, and inspections are needed.