Electronic Subcontract Manufacturing Solution in China

Electronic contract manufacturing or ECM is a service that operates as a liaison between OEMs and EMSs. ECMs buy raw materials from EMSs and sell them to the OEM. They also place orders for manufactured components with EMSs. ECMs can take advantage of economies of scale to offer lower prices than the typical OEM. It is because specialization can provide PCB EMS services at a lower cost.

ECMs can also offer specialized services such as packaging and design of electronic parts. It is highly specialized but extremely time-consuming and costly. However, new technologies such as 3D printing and new materials used in electronics production allow ECMs to offer these services more efficiently. They can also guarantee that customers get exact copies or prototypes that comply with their requirements. It also reduces the risk inherent in product development. ECMs also promote products to new markets by offering different solutions tailored to specific customer needs.


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The main ECM services include:

Technology Licensing

This service includes purchasing technology from one PCBA supplier and providing it to another for a set fee or royalty. You can use the technology licensing when the buyer cannot create new technology. It makes them feel they can use someone else’s investment, patenting, and creation costs.


Packaging is an essential factor in electronic chips, printed circuit boards, and mobile phones. But it has become more than just a market for such products. The newest packaging services include the design of products with cleaning and testing functions. Many companies offer packaging services. Their specialties vary widely, from designing the package to considering the entire product. From creating a package to making it simple and easy for consumers to use and maintain.

Product design

It is a relatively new service, but its importance is growing as the market for electronic components grows. This service includes many specialty areas of product design, for example, hardware development of chips or boards and 3D printing of parts—also, special markets such as designing a circuit with multiple functions. The designer will determine the function and search for a supplier who can produce that product.

Quality assurance

This service includes providing a testing center or a test station for large or essential orders. The main elements of such services include ensuring that the product meets the required quality and that any problems found during the production process can fix easily and inexpensively.


The ECM provides this service to ensure that they deliver the products on time according to the OEM’s requirements. It includes inspection and packaging of goods, installing parts and components, and ensuring quality control throughout the process.

PCB Assembly

This service refers to the assembly of circuit boards or printed circuit boards. It is a process that includes assembling components and connections and putting the board through a series of tests.

Component sourcing

This service refers to finding parts suppliers for an OEM. It is especially cost-effective for those who have many orders from many different companies. The service allows them to solicit orders from their suppliers without placing each order individually and waiting for a response from each supplier. It also helps the OEM avoid unnecessary purchases and stock-outs.


Unlike most EMSs, ECMs have a complete prototype service. From consulting with the customer to developing a design and building a prototype sold in the market. This service is helpful when the product is new, and its purpose is to ensure that no customer discovers problems with the product before it goes on sale. It also increases efficiency for the ECM because it allows them to conduct a series of tests without waiting for shipping time.

Aftermarket services

This service refers to an ECM’s support after selling the product. Aftermarket services include repairing or fixing defective products, maintaining products in use, and looking for ways to improve the product by bearing the cost of purchasing new parts. This service contributes to improving production efficiency and customer satisfaction, which in turn helps sales.

Difference between ECM and EMS

An ECM’s primary competitor is the EMS, which performs some of the same services as an ECM. The main difference between ECMs and EMSs is their size. Although they perform many of the same services, most ECMs are much smaller than their more established counterparts. Some ECMs specialize in smaller orders and for highly specialized products. They may be able to offer more inexpensively than larger companies can.

As a third party to the OEM and EMS, one may see ECM as a link between this industry’s two major players. Both EMSs and ECMs offer various services for electronics products. However, there are some differences between these two sectors. EMS refers to a large-scale production facility that provides a variety of services from a single source. In contrast, an ECM is an independent entity that provides electronic component production services. An EMS is more established than an ECM because it has been in existence for several decades. On the other hand, many ECMs are relatively new players in the industry.

ECMs provide electronics manufacturing services and offer an array of value-added services to their customers. While EMSs may not provide such services. Further, some ECMs specialize in specific products, while some EMSs specialize in specific markets.


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Steps for an EMS to perform electronic manufacturing services

ems manufacturing companies

Step 1:

EMS needs to have a factory or a production base. The base is to produce electronic components to perform electronic manufacturing services. An EMS must have the capacity. Also, the equipment necessary to perform all the steps required for managing a manufacturing facility. Some larger EMSs may already hold a patent on some of their products and simultaneously produce components and finished products in their factories.

Step 2:

Electronic manufacturing services require that an EMS have all the necessary facilities for managing the manufacturing process. The EMS requires a clean room with essential equipment to control airflow, temperature, humidity, and other factors to produce quality products.

Step 3:

Before providing electronic components to an OEM, an EMS must source its raw materials. It refers to the suppliers who will provide the components required by the EMS. Since an EMS must communicate with its suppliers, it must have a transportation system equipped with all the necessary equipment to handle the material safely. Because they must ship all goods in a fully enclosed container or setup, an EMS must have a factory capable of handling large materials.

Step 4:

Once an EMS has sourced its raw materials, it can package them and ship them to the OEM. EMS must have a quality control department that performs tests on all the components to ensure quality control throughout the manufacturing process.

Step 5:

Once the EMS has shipped a batch of electronic components to the OEM, it can begin manufacturing its finished products for sale in the market. For this purpose, an EMS performs various other services. They include consulting with customers, handling customer product orders, and other related tasks. One can perform these tasks from their factory or from other facilities that it owns.

PCBA prototype

We use PCB prototypes in the early stages of mechanical design by using CAD software to design a PCB PCBA. Designing a PCBA prototype is necessary before finalizing the mechanical design of the device. Ultimately, they will manufacture the device and test it before sealing it into its final packaging. Still, an earlier stage of testing can identify functional or physical problems that may require changes in the design.

PCB prototyping

PCB prototyping occurs when one makes an electronic component fit into a PCB (printed circuit board). One can make the PCB fit into a larger system of electronic and electrical components and circuits. At this point, the small, printed circuit board is fully functioning. It allows for testing of the element before the final assembly of the product into its final packaging. You can test all parts functionally and physically through this method before sealing them into their final form.

  1. You can perform PCBA prototyping after designing a device that has is not yet finalized for full production. After finalizing a design, you can make a prototype of it. The electronic component is test-fitted onto a board during this stage, and they install wires soldering them in place.
  2. PCBA prototyping involves using an etched PCB to make the final electronic component fit in place. It should fit without gaps between components. Prototypingis useful when physical or functional testing reveals that there may be some problems with the design of the printed circuit board. In which case, you need to change it before production begins.
  3. One can perform PCBA prototyping on a single printed circuit board without any components fixed to it. It is useful after placing the component onto an assembly but not completing the electronic testing.

PCBA assembly process

The following steps are necessary to design a PCBA that will work with all types of electronic assemblies:

  1. The first step is to specify the components required by the assembly. You can apply different PCBA designs in this step depending on how many components there are and what type of assembly you will be using. It is simpler if one component is being used or a more complex design if you need more than one component for an assembly.
  2. The second step is to wire the components with a PCBA. It requires doing the internal wiring of the PCBA by installing wires inside the board. We use wires to connect the components within a single assembly.
  3. The third step is to solder all components together using a reflow oven or hot plate to melt the solder that binds all components together.
  4. Step number fouris to assemble the individual parts onto a PCB. You can do this by inserting the PCBA into a board, fitting the components, and then inserting the board into another larger PCB.
  5. The final step is to test the assembled assembly for proper function before performing the final assembly of all boards. It involves testing various components to ensure that they work together properly. This stepalso involves testing all assemblies within an electronic assembly system before shipping them out.

Fundamentals of PCBA services

One can perform PCBA services differently depending on the customer who hires the manufacturer. Usually, there is a prototype PCBA that contains small components and can fit onto a small board. This prototype allows the customer to make changes and test electrical and mechanical functions. They can also change parts and circuits before ordering large-scale production copies.

Step one involves designing the board that will be useful for the final product. The quality control must approve the design must before manufacturing them into an assembly or assembly circuit. It means that you must test the electronic components before manufacturing begins. You must test the assembly to ensure that the electricity flows across the board and that all components work as they should. Usually, one creates a PCBA prototype with tweaks made from the prototype design.

PCBA test services

After designing, customizing, and manufacturing a PCBA, you should test the electronic components. It helps ensure that it will work properly when assembled. You can perform this by an in-house department or by a third-party testing service. To test the PCBAs, they must clean and prepare them before testing them separately from their final assembly.

It means that you must clean the PCBAs of all surface glues and any residue of outside materials so that the final assembly is without harming the design. Testing involves running each component through its entire circuit. You do this while checking wire connections, voltages, and other components not designed into the circuit. Usually, they test the circuits while assembling them on a board using an electronic assembly system. It allows for testing all parts while they are functioning together as one unit rather than individually.

There are many reasons why it is necessary to test a PCBA:

  1. They must test all parts must before they assemble them into a final product. Onecan test electrical and mechanical parts for proper function and assembly of all components. They will do this before they solder them together on a printed circuit board. It allows for testing and changing parts before they assemble the final product.
  2. Testing a PCBA is necessary because it must be rigorously checked for defects before production. If they find a part or circuit to have a defect in a test, they can correct the system before they assemble the final product. It saves time and money in the long run since assembly of the product would not have been necessary if they caught it in testing.
  3. To improve quality, testing is often done before assembly. It allows for quick checking of components and circuits that need improvement or repairs before final assembly.
  4. Testing can check for flaws in parts that were not designed into the circuit, including connections and polarity of all parts within it. If they find a small part to have flaws in its actual design, they can correct it before the final product goes into production.
  5. Testing helps ensure that they remove any parts changed or not compatible with the rest of the parts within the circuit. If they change a part, they must test it against all other parts to ensure it still works properly. A change in one part will affect another component within the whole circuit. Itcan prevent any changes from creating problems during the final assembly of all components onto a board.
  6. Testing allows for the performance of quality control before performing the product’s final assembly. It allows for checking all components and their functionality before they make the assembly.

Types of PCBA Testing

Many different types of testing that one can do on a PCBA. The tested parts will depend upon the design, quality standards, and the intended product that the PCBA will do. Here are some of the most common types of things that we test on a circuit board:

  1. Connections, including polarity and insulation
  2. Testing of the entire circuit, including checking of all electronic parts within it
  3. The testing of individual parts, including checking that they work properly and are compatible with the rest of the circuit
  4. Testing for flaws in undesigned parts into the circuit, including connections and polarity of all parts within it
  5. The testing for compatibility with other boards or systems using similar components
  6. Testing for various environmental conditions, such as temperature testing or water resistance testing
  7. The testing of all parts to ensure that they are working correctly, and no pieces are missing
  8. Testing for memory capacity and functionality of all electronic parts
  9. The testing soldering to ensure that the electronic components will not short out or cause any other problems when in use.
  10. Testing to make sure that the board can withstand any temperatures. It can also withstand other environmental conditions they may face during use in a final product.


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Choosing a PCBA company

ems contract manufacturing

Providing PCBA designs can be a difficult task. To create the optimum PCBA that will work with the actual product they are manufacturing, one must consider many factors. The most crucial consideration depends on the design itself. One must create the design so that it works properly with every other component in the circuit. If it is not, testing can easily reveal these problems, resulting in faulty components and circuits.

Another critical factor in the design of the PCBA is the quality standards that are set. The quality standards ensure that they make each component to high standards before soldering it onto the PCBAs. However, very few companies will provide this level of quality control. It means that they may not provide certain components or parts if their specified level of quality is not met.

There are many different types of PCBA designs created by RayMing PCB and Assembly. Here are some of them:


Planar PCBA designs are also called Single Layer PCBAs. It means that one creates the circuit on a single layer of a printed circuit board. They do it with a layer of soldering on top of it that makes up the connections between other components within the circuit.


Dual-layer PCBAs are also called Double Layer PCBAs. It means that there are two layers to the printed circuit board. They allow for easier routing and creating of circuits, making them more useful for electronic devices.


Multilayer PCBAs are also called multilayer PCBs or simply MLPCB. This design uses multiple layers of printed circuit boards to create the final product. It makes it more useful for electronic devices that require many different components.


Hybrid PCBAs are also called Hybrid PCBA. This type of PCBA divides the circuit into sections to create easier control and optimize space on the printed circuit board.


Retro PCBAs are also called Printed Circuit Board Circuits. This type of design is a hybrid PCBA with a single layer of printed circuit board with components. It is then connected to create the final product.

Closed Loop

Closed-loop PCBAs are also called Closed-loop PCBAs or simply ClC-PCBAs. This type of design allows testing on the circuit before assembling them onto the printed circuit board. It can help check for problems with electronic components and many other things that may arise in the future.

Open Loop

Open-loop PCBAs are also called Open-loop PCBAs or simply OLPCBAs. This type of design allows testing on the circuit before assembling them onto the printed circuit board. It can help check for problems with electronic components.


Electronic contract manufacturing is a difficult task to accomplish. You must consider many different factors when creating a circuit board for it to work properly and have proper quality control. One needs to make the design work with all the other parts within the circuit. They can make many other types of designs, depending upon the product they are manufacturing.

Many different factors can affect PCBA designs. It includes all components within the circuit and many external factors, for example, environmental conditions or intended product use. It is essential to choose a PCBA company to get high-quality circuit boards carefully. One that will work appropriately for the specific product they are manufacturing. Also, one that will work with the circuit of every single electronic component.


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