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Introduction:
What's a SMT PCB Assembly?
SMT PCB Assembly means Surface Mount Technology, known as a a kind of Circuit assembly technology that installs the SMC/SMD (named Chip Components in Chinese) on the surface of Printed Circuit Board or on the surface of other substrates, which is solded and assembled by means of reflow soldering or dip soldering. It realizes high density, high reliability, miniaturization and low cost of electronic product assembly.
Ⅰ. The role of SMT PCB assembly
SMT PCB assembly, referred to as PCBA, is to install components and perform soldering on a printed circuit board (PCB) to form a fully functional circuit board. PCBA can achieve the connection and control between different components and devices, and undertake the task of information transmission and processing. Therefore, circuit board assembly is widely used in electronic product manufacturing, communication equipment, instrumentation, automotive electronics, medical equipment and other fields.
Ⅱ. The process of SMT PCB assembly
Circuit board assembly includes multiple links such as component procurement, PCB production, component mounting, wave soldering, and functional testing. The specific process is as follows:
1. Component procurement. Select and purchase components according to the BOM table to ensure the accuracy of component quality and quantity.
2. PCB production. Design PCB according to the circuit schematic and layout diagram, and then make the circuit board through printing process.
3. Component mounting. Use a chip mounter to stick components on the circuit board. This is the most complex and technology-intensive link in the whole process.
4. Wave soldering. Wave solder the soldered components and circuit boards to ensure that the connection between components and PCB is firm and reliable.
5. Functional test. Perform functional test on the circuit board to verify whether the performance of the circuit board meets the expected target. If there is a problem, the entire process needs to be reworked and debugged.
Ⅲ.Precautions for SMT PCB assembly
1. SMT PCB assembly requires the use of some special equipment and tools, such as placement machines, ovens, wave soldering machines, etc. Therefore, it should be carried out in a professional PCBA manufacturer or factory.
2. Before assembling the circuit board, you need to prepare relevant materials such as BOM table, circuit schematic, PCB layout diagram, component information, etc.
3. The quality and packaging method of components have a great impact on the quality and performance of the circuit board. According to the circuit requirements, appropriate components should be selected for assembly.
4. Before assembling the circuit board, it is necessary to check whether the quality and quantity of the components are complete.
5. When soldering components, care should be taken to protect the components and PCB from damage.
Product Details:
Payment & Shipping Terms:
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| Production Name: | PCBA | Min. Hole Size: | 0.1mm |
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| Brand Name: | OEM | Components: | Qulified |
| SMT DIP: | Support | Type: | SMT PCB Assembly |
| High Light: | SMT pcb prototype and assembly,Mass Production SMT PCB Assembly 0.1mm Hole,Layer 2 SMT PCB Assembly |
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SMT PCB Assembly Manufacturer For Prototype And Mass Production PCB Assembly Service
Features
1. One Stop OEM Service: Made in Shenzhen of China
2. Manufactured by Gerber File and Bom LIst Offered by Customers
3. SMT, DIP Technology Support
4. FR4 Material Meet 94v0 Standard
5. UL,CE,ROHS Compliant
6. Standard Lead Time: 4-5days for 2L;5-7 for 4L. Expedited Service is available
Specifications
Material: Shengyi FR4
Finish Board Thickness: 1.6MM
Finsh Copper Thickness: 1OZ
Layer: 2
Solder Mask Color: GREEN
Silkscreen: WHITE
Surface Treatment: HASL LF
Finished Size CUSTOMIZED
What KAZ Circuit can do for you:
PCB manufacturing (prototype, small to medium, mass production)
Components Sourcing
PCB Assembly/SMT/DIP
To get a full quotation of the PCB/PCBA, pls provide the information as below:
Gerber File, with detail specification of the PCB
BOM List (Better with excel fomart)
Photoes of the PCBA (If you have done this PCBA before)
Company Informaiton:
KAZ Circuit is a professional PCB manufacturer from China since 2007, also provide PCB Assembly service for our customers. Now with about 300 employees. Certified with ISO9001,TS16949, UL, RoHS. We are confident to provide you quality products with factory-directed price within the fastest delivery time!
Manufacturer Capacity:
| Capacity | Double Sided: 12000 sq.m / month Multilayers: 8000sq.m / month |
| Min Line Width/Gap | 4/4 mil (1mil=0.0254mm) |
| Board Thickness | 0.3~4.0mm |
| Layers | 1~20 layers |
| Material | FR-4, Aluminum, PI |
| Copper Thickness | 0.5~4oz |
| Material Tg | Tg140~Tg170 |
| Max PCB Size | 600*1200mm |
| Min Hole Size | 0.2mm (+/- 0.025) |
| Surface Treatment | HASL, ENIG, OSP |
SMT PCB assembly procedure:
PCB Prep:
Clean the PCB substrate to remove any contaminants that may affect solder joint quality.
Apply solder mask to the PCB to identify copper pads where components will be placed.
A surface treatment such as ENIG (Electroless Nickel Immersion Gold) is applied to the copper pads to promote solderability.
Solder paste print:
Place the stencil over the PCB with the stencil's openings matching the PCB's copper pads.
The solder paste (a mixture of solder alloy particles and flux) is scraped across the stencil, depositing the solder paste on the pads of the PCB.
Precise control of stencil thickness, solder paste volume, and squeegee pressure are critical for consistent solder paste deposition.
Element placement:
Automatic pick-and-place machines use vision systems to accurately identify component locations and place them on the solder paste.
Component orientation, coplanarity, and positional accuracy are critical to reliable solder joints.
Additional components such as connectors or heat sinks can be placed manually.
reflow soldering
PCB components are passed through a reflow oven with carefully controlled temperature profiles.
The solder paste melts, moistening the component leads and PCB pads, and forms a solder joint as it cools.
Different solder alloys, such as lead-free (such as tin-silver-copper), have specific reflow temperature profiles.
Inspection and Testing:
Visual inspection (manual or automated) checks for proper component placement, solder joint quality, and potential defects.
Automated optical inspection (AOI) systems use machine vision to quickly identify and locate any problems.
Electrical testing, such as in-circuit testing (ICT) or functional testing, verifies the electrical performance of the PCB.
Clean and Conformal Coating (optional):
PCB assemblies may undergo a cleaning process to remove any remaining solder paste or flux.
Conformal coating is a polymeric protective layer that can be applied to PCBs to increase moisture and environmental resistance.
SMT PCB assembly requires strict control over the entire process to ensure high quality and reliability of electronic products. Continuous improvements in automation, process control, and inspection technologies are critical to the widespread use of SMT in modern electronics manufacturing.
Pictures
Contact Person: Mrs. Helen Jiang
Tel: 86-18118756023
Fax: 86-755-85258059
