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As SMT assembly supplier, GreensTone SMT production runs with automated SMT production processes, including single or double-sided component insertions. STM components include passive Component: components as small as 01005, 0201,0402.
ICs like BGA: handle BGA of 0.25mm pitch with X-ray testing, fine Pitch to 0.25mm UBGA, QFN, POP, leadless chips, connectors and terminals, these components can be in Reels, Cut Tape, Tube & Tray, Loose Parts and Bulk package.
+ 5000 M2 Workshop
+12 year EMS experience
3 SMD assembly lines
2 DIP lines
6 X-rays + AOI
High quality At the customer's request, contract electronics manufacturing factory GreensTone always sources components from suppliers recommended by the client. We do not replace components or use a supplier that is not approved by the customer. Incoming quality control, outgoing quality control and in-process quality control. Visit our reliable network of suppliers, on-site inspection of raw material, internal audits monitor facilities, all requirements specified in writting, any changes are made through a secure approval process.
Cost Effective-We are located in the city Shenzhen(The electronics components center),China .This allows us to provide low-cost circuit board manufacturing,lectronic components procurement and assembly services.
Experienced team work
We have more than 10 years experience in contract manufacturing. when you come to work with GreensTone to start China prototype pcb assembly services or contract manufacturing project, our sales people will get in touch with you at first, the design assistant engineer will check your files include BOM list, drawings and components specifications.when you decide to order from us, the project manager will set-up project account for you, our assembly engineer will give you some advanced assembly suggestion before volume production. So you can see, we have at least 4-5 expertise work as a team, these engineers are with backgrounds in mechanical design, testing, materials,injection for plastics and CAD modeling.
GreensTone always has good performance in complex manufacturing, we have expertise in electronics components,expertise team in plastic/metal/cable parts,expertise team in assembly&testing and expertise team in quality control. For a new complex project, run the project in sections is important. Run a project we go like this: project review--project--approval --prototype--small batches--Bulk production.
Flexibility We react quickly to your changing needs. Our working time and style is flexible to meet your variable needs. To us, your requirements are our guidelines and rules to follow.
Whether you need design support, electronic manufacturing services or technology expertise, we can help. And we'll do it wherever you are in the product development process-from design and manufacturing to supply chain, logistics and packing-to bring your products to market faster and more efficiently. We have expertise in mechanicals, plastics and electronics. We have the flexibility to provide support across your entire product life-cycle, including expert design collaboration, robust testing, advanced assembly capabilities and more.No matter the volume, scale or complexity of your products
Care about your product security whole-life long-term run, we have:
Expertise in meeting UL/CE/VDE requirements
RoHs-compliant manufacturing process.
IS09001&IS014001 certification
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In the ever-evolving world of electronics, innovations in manufacturing techniques have played a pivotal role in the miniaturization, performance enhancement, and cost-effectiveness of electronic devices. Surface Mount Technology (SMT) is one such manufacturing technique that has revolutionized the way printed circuit boards (PCBs) are assembled. In this guide, we will delve into what SMT is, how it works, its advantages, and its significance in modern PCB manufacturing.
Surface Mount Technology, commonly referred to as SMT, is a PCB assembly method that replaces traditional through-hole technology (THT). While THT involves inserting component leads through holes in the PCB and soldering them on the opposite side, SMT components are mounted directly onto the surface of the PCB. SMT components are smaller, lighter, and enable higher component density on the PCB.
Surface Mount Technology (SMT) is a pivotal advancement in the field of printed circuit board (PCB) assembly. It has revolutionized the way electronic components are mounted onto PCBs, enabling smaller, lighter, and more efficient electronic devices. In this comprehensive guide, we will walk you through the SMT PCB assembly process, step by step, providing insights into each stage and the importance of precision and quality control.
1. PCB Design and Preparation
The SMT PCB assembly process begins with meticulous PCB design. Design engineers use specialized software to create the PCB layout, considering factors such as component placement, signal routing, and thermal management. The design must adhere to industry standards and ensure that components fit precisely.
Once the design is finalized, the PCB fabrication process begins. This involves creating the actual PCB by etching the copper layers, drilling holes, and applying solder mask and silkscreen. The result is a bare PCB ready for component placement.
2. Stencil Fabrication
To apply solder paste accurately, a stencil is created. This stencil is typically made of stainless steel or nickel and is precisely machined to match the PCB's layout. The stencil contains openings (apertures) corresponding to the pads where components will be placed.
3. Solder Paste Application
Solder paste is a critical element in the SMT process. It consists of tiny solder particles suspended in flux. The solder paste is applied to the PCB's pads using the stencil and a specialized machine called a solder paste printer. The stencil ensures that the paste is deposited only on the designated areas.
The solder paste serves two primary purposes:
Facilitating Component Attachment: When heated, the solder paste transforms into a liquid state, allowing components to attach securely to the PCB.
Solder Joint Formation: After component placement, the solder paste solidifies, creating solder joints that establish electrical and mechanical connections between the components and the PCB.
4. Component Placement
This stage involves the precise placement of SMT components onto the PCB. Automated pick-and-place machines are used for this purpose. These machines are programmed with the component placement data from the PCB design files, enabling them to pick up components from reels or trays and place them with pinpoint accuracy onto the solder paste-covered pads. Component placement speed and accuracy are crucial for efficient PCB assembly.
5. Reflow Soldering
After component placement, the PCB enters a reflow soldering oven. The reflow soldering process consists of several critical phases:
5.1. Preheating: The PCB is gradually heated to a specific temperature to activate the flux in the solder paste and eliminate any moisture.
5.2. Temperature Soak: The PCB is held at a peak temperature for a set duration to ensure that the solder paste fully melts and wets the component leads and PCB pads.
5.3. Cooling: The PCB is cooled gradually to solidify the solder joints. Proper cooling is essential to prevent thermal stress on components.
Reflow soldering is a precise process, with strict temperature profiles tailored to the specific components and solder paste used. The goal is to achieve reliable solder joints without overheating or damaging sensitive components.
6. Inspection and Quality Control
After reflow soldering, the PCB undergoes thorough inspection to identify any defects or issues. Automated Optical Inspection (AOI) and X-ray inspection are commonly used methods to check for:
Component placement accuracy: AOI verifies that components are correctly positioned on the pads.
Solder joint quality: AOI checks for solder joint defects such as insufficient solder, excess solder, solder bridges, and tombstoning.
Component presence and orientation: AOI ensures that all components are present, correctly oriented, and in the right locations.
Any detected defects are flagged for rework or repair, ensuring that only high-quality PCBs proceed to the next stages.
7. Additional Processing (Optional)
Depending on the specific requirements of the PCB and the assembly, additional processes may be necessary:
Selective Soldering: In cases where through-hole components are required alongside SMT components, selective soldering machines can be used to solder the through-hole components without affecting the SMT components.
Conformal Coating: If environmental protection is needed, conformal coating may be applied to the PCB to safeguard it against moisture, dust, and other contaminants.
Functional Testing: In some cases, functional testing may be performed to verify that the PCB operates as intended. This can involve applying power and signals to the PCB to simulate real-world conditions.
8. Cleaning (Optional)
Cleaning is essential to remove any residue left by the solder paste or flux after the assembly process. It is especially important in applications where cleanliness and reliability are critical, such as aerospace or medical devices. Automated cleaning machines use specialized cleaning agents to thoroughly clean the PCB.
9. Final Inspection and Testing
Before the PCBs are shipped to customers or integrated into electronic devices, they undergo a final inspection and testing phase. This ensures that all components are correctly soldered, all functions are operational, and the PCBs meet the required quality standards. Random sampling and testing are common practices in large-scale PCB manufacturing.
10. Packaging and Shipping
Once the PCBs pass final inspection and testing, they are packaged according to customer specifications and prepared for shipping. Careful packaging is essential to prevent damage during transit.
1. Component Placement: The first step in SMT assembly is the placement of components on the PCB's surface. This is typically done using automated pick-and-place machines. These machines are programmed to precisely position each component in its designated location on the PCB.
2. Solder Paste Application: To ensure components adhere securely to the PCB, a solder paste is applied to the pads on the board where the components will be attached. The solder paste is a mixture of solder particles and flux, which facilitates the soldering process.
3. Reflow Soldering: Once the components and solder paste are in place, the entire PCB is passed through a reflow soldering oven. This oven heats the PCB to a specific temperature, causing the solder paste to melt and form a strong bond between the components and the PCB's surface. The precise temperature and heating profiles are critical to ensure proper soldering without damaging the components.
4. Inspection and Quality Control: After reflow soldering, the PCB undergoes inspection to identify any defects or soldering issues. Automated optical inspection (AOI) and X-ray inspection are commonly used to check solder joints and component placement accuracy. Any defective PCBs are flagged for rework or repair.
5. Testing and Functional Verification: Following inspection, the PCB may undergo functional testing to ensure that all components function as intended. This can involve applying power and signals to the PCB to verify its performance.
6. Cleaning: To remove any residue from the soldering process, the PCB may be cleaned using specialized cleaning agents and equipment. Proper cleaning is essential to prevent long-term reliability issues.
In the rapidly evolving world of electronics manufacturing, partnering with a trusted and experienced Surface Mount Technology (SMT) PCB assembly expert is essential. GreensTone, a leading player in the field, stands out as your go-to expert for all your SMT PCB assembly needs. In this concise guide, we'll explore why GreensTone is your trusted partner and the key advantages they bring to the table.
GreensTone's SMT PCB Assembly Expertise
GreensTone boasts a wealth of expertise and a solid reputation in the realm of SMT PCB assembly. Their experience extends across a wide range of industries and applications, making them a reliable choice for both small-scale projects and large-scale production runs.
Key Advantages of Choosing GreensTone
Here are the primary reasons why GreensTone is your SMT PCB assembly expert of choice:
1. Comprehensive SMT Solutions
GreensTone offers a comprehensive suite of SMT PCB assembly services tailored to your specific needs. Whether you require Full Turnkey assembly, Partial Turnkey assembly, or have specialized requirements, GreensTone has you covered. Their flexible approach ensures that your project receives the attention and services it deserves.
2. Uncompromising Quality Control
Quality is at the forefront of GreensTone's services. They implement rigorous quality control measures at every stage of the assembly process. From component inspection to soldering quality checks, GreensTone is committed to delivering PCBs of the highest quality standards. This dedication to quality minimizes the risk of defects and ensures the reliability of your electronic products.
3. Cutting-Edge Technology and Equipment
GreensTone is equipped with state-of-the-art machinery and technology, enabling them to achieve precise component placement, efficient soldering, and superior manufacturing quality. Their commitment to staying at the forefront of technological advancements enhances the overall performance and reliability of your PCBs.
4. Customized Solutions
Recognizing that every project is unique, GreensTone collaborates closely with you to accommodate specific component preferences, design complexities, and compliance requirements. They tailor their services to align with your project's individual needs, ensuring a customized and precise approach.
5. Speed and Efficiency
In the fast-paced electronics industry, time-to-market is critical. GreensTone's streamlined processes and advanced equipment enable them to complete projects quickly and efficiently. This efficiency ensures that your products are ready for market in a timely manner, giving you a competitive edge.
6. Proven Track Record
GreensTone has established a solid reputation for reliability and excellence in SMT PCB assembly. Their track record of successful projects and satisfied clients speaks volumes about their capabilities and commitment to delivering top-notch results.
7. Cost-Effective Solutions
GreensTone's cost-effective procurement practices, combined with reduced rework and warranty-related expenses, can lead to significant long-term cost savings. They understand the importance of cost-efficiency and work diligently to maximize the value of their services.
8. Industry Diversification
GreensTone's expertise isn't limited to a single industry. They have successfully served clients across various sectors, including consumer electronics, automotive, aerospace, medical devices, industrial automation, and communication technology. Their ability to adapt to diverse industry requirements demonstrates their versatility and competence.
