SMT is a flexible and powerful assembly process that has allowed manufacturers to produce modern devices with ever-smaller footprints. In SMT, all the different components needed for today's devices are attached to the surface of the printed circuit board. SMT can be highly automated, so it's a natural fit for clients who need circuit boards in high volume, but it's also highly customizable. If you need circuit boards assembled to meet unique requirements, SMT may be the best choice.
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EMSG is a longstanding provider of surface mount PCB assembly services for customers in a range of industries. We specialize in contract manufacturing and have extensive experience with assembling electronics for a wide range of applications. With a broad selection of equipment and expert staff, we can assist with product prototyping and testing, contract manufacturing and more. Read on for details or contact our office directly to request a quote.
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Briefly put, SMT is a process for electronics assembly in which electronic components supplied are mounted to the surface of a printed circuit board (PCB). It's a highly automated and flexible process that allows manufacturers to construct circuit boards with a wide variety of components.
Surface mounting has several advantages over similar PCB manufacturing techniques. Perhaps most importantly, it allows for much smaller products ' up to one-third the size and one-tenth the weight of through-hole boards ' and higher connection densities. SMT enables manufacturers to place increasingly complex circuits into small assemblies, so it has been a crucial factor in the proliferation of small electronic devices in everyday life.
Surface mount boards are also faster and easier to assemble and more cost-effective than boards constructed with through-hole technology. Through-hole PCB assembly is an older technology which involves attaching leads to holes drilled into the circuit board. This process creates very durable products, as these connections are quite sturdy. It can be more expensive than SMT, though, and the component density is generally higher. Our engineers can help you determine which assembly process best fits your use case.
There are four basic steps in the process of PCB SMT board design assembly:
Before adding components to the circuit board, the assembler uses a solder paste printer to place solder paste where it's needed on each circuit board. The solder paste is a mixture of solder particles and a special flux. Heating this solder paste during the reflow process causes the electrical connections to form.
Manufacturers often use a stencil and squeegees to make sure that the solder paste is printed in the right places on each circuit board. Jet printing is another option for prototype PCB assembly.
After the solder paste is applied and inspected, the assembler carefully places the components on the circuit board. Typically, these components are packaged in trays, reels or tubes so that a pick-and-place machine can use a vacuum or gripper nozzle to pick the components and position them on the flexible PCB.
There are a variety of components and connection types used in SMT. Transistors and diodes are typically housed in small plastic packages while integrated circuits come in various kinds of packages. Simple chips might have as few as 14 pins, while more complex chips may need 200 or more. VLSI chips, for example, are rectangular packages with pins on all four sides. Ball grid array (BGA) packages are also quite common. Instead of establishing connections on the sides, BGA packages have connections underneath for a layered PCB design.
The solder paste holds the components in place temporarily, but the electrical components are not fully attached to the unit and the electrical connections are not formed until the PCB layout undergoes reflow soldering. In a reflow oven, the units are heated until the solder paste reaches a temperature high enough for the solder joints to form. This process needs to be controlled carefully as the maximum temperature of the components may be close to the temperature required to create acceptable solder joints.
To ensure the highest quality products, we employ an array of inspection equipment. Two Mirtec MV-3L automatic optical inspection (AOI) units detect component defects, confirming that all components are attached, functional and have the right polarity. We keep a complement of equipment on-hand for functional and optical inspection and use a Cyberoptics Laser Section microscope to confirm that solder paste is applied to the correct height.
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With an in-house x-ray inspection station, EMSG can conduct efficient inspections of BGA and Micro-BGA components.
In addition to being a surface mount PCB assembly company, we provide our clients with full-service manufacturing from assembly capabilities to box build to testing and inspection.
We'll design, source and install the wiring harnesses, cables and sub-assembly components necessary for your device, and then put it all together in a custom-designed enclosure. Need the design software loaded and the system configured for use? We can take care of that and handle the packaging and labeling as well.
EMSG also performs the comprehensive testing and inspection services necessary to make sure that your products are functional and reliable. It starts with visual inspection under 100% magnification but can include automated optical inspection, in-circuit testing and functional testing.
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With every client we work with, we customize our approach as necessary to deliver the best results for their needs. Because we specialize in contract manufacturing, making adjustments or modifying our workflow is easy. Our management team is available to consult on engineering and manufacturing issues, drawing from more than twenty years of experience to help you achieve results that respect your budget, timeline and technical considerations.
Which industries partner with us for electronics assembly? We are an ideal partner to the medical device manufacturing industry, where small surface mount boards play a critical role in the proper operation of various products. Other clients come to us from sectors such as telecom and communications, industrial and commercial equipment, traffic and transportation, lighting, marine equipment, energy and utilities and other segments of the manufacturing market.
No matter what industry or application you need circuit boards for, EMSG has the equipment, expertise and certifications to produce the reliable, high-quality products you need. Our location in York, PA places us near major East Coast population centers. We offer consultation by , and in-person.
When you meet with one of our team members, we'll take the time to get to know your requirements and the specifics of your industry. Surface mount PCB assembly is only one aspect of the process. We can provide a complete turnkey service that brings your product to market quickly and affordably while minimizing the risk of defects.
Ready to get started? Get in touch today to learn more about our surface mount circuit board assembly services and book a consultation at your convenience by filling out our request a quote form. If you don't have design or Gerber files we'll work with you to create a design. If you require a quick turnaround PCB quote or lead time, please let us know and we'll work with you to accommodate your specific needs.
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