Reliable and high-precision PCB assembly is indispensable for electronic product manufacturing. With compact designs, high component density, and high-quality requirements across mid to high-end applications, such as IoT, medical devices, industrial automation, and consumer electronics, choosing the right PCBA partner for PCB assembly and soldering services is important.
PCBONLINE provides turnkey PCB assembly and soldering services from SMT and THT assembly to PCBA testing, conformal coating, IC programming, and final device assembly. As a source factory PCBA manufacturer with our turnkey PCBA factory, we control the PCBA process, ensuring lead time and high quality for every order.
PCBA Factory Assembly Lines
Unlike brokers or trading companies, PCBONLINE owns a turnkey PCB assembly factory with a component warehouse. Our PCBA factory is equipped with:
- 4 fully automated SMT (surface-mount technology) assembly lines
- 4 THT (through-hole technology) semi-automatic assembly lines
- A controlled-environment electronic component warehouse
- Comprehensive PCBA testing and inspection systems
- PCBA value-added facilities and box-build assembly services
Besides turnkey PCB assembly and soldering services, we provide PCB fabrication from prototypes to mass production in our two advanced PCB manufacturing bases. By cooperating with PCBONLINE for turnkey PCB assembly, you can benefit from:
- Faster lead times
- Lower costs without middleman fees
- Total process transparency
- Strict and consistent quality control
- Real-time engineering support
Our PCB assembly and soldering services comply with ISO 9001:2015, ISO 14001:2015, IATF 16949:2016, RoHS, REACH, UL, and IPC-A-610 Class 2/3. Our engineers all have 10+ years of engineering experience and provide one-on-one support to you.
SMT Assembly: High Speed, High Accuracy, High Reliability
Surface-mount technology is at the heart of electronics manufacturing. PCBONLINE operates four fully automated SMT lines to handle everything from micro-SMD components to large and complex ICs.
Each of our SMT lines includes:
- An automatic solder paste printing machine
- SPI (Solder Paste Inspection)
- Two high-speed YAMAHA YSM20R pick-and-place machines
- One functional YAMAHA YSM10 pick-and-place machine
- AOI before reflow
- 10-zone reflow soldering oven
- AOI after reflow for final SMT inspection
Our advanced SMT lines ensure stable, accurate, and defect-free SMT assembly for demanding applications, meeting soldering requirements for PCBs like high-density, thick-copper, flexible, high-Tg FR4, ceramic substrate, etc.
Among the machines on an SMT line, solder paste printing, SMD pick-and-place, reflow soldering, and dual AOI are the most important steps for ensuring PCB assembly quality. Details are below.
Automated solder paste printing and SPI
The SMT process starts with stencil printing. We use high-precision automatic solder paste printers that ensure uniform paste deposition, perfect alignment, and reduced bridging and soldering defects.
After printing, our solder paste inspection system checks the thickness, volume, area, and uniformity of the solder paste. This prevents defects at the earliest stage, ensuring an excellent foundation for the entire assembly process.
High-speed pick-and-place with YAMAHA YSM20R
Our SMT lines are equipped with two YAMAHA YSM20R high-speed placement machines, designed for handling extremely small components with maximum precision. Their capabilities are:
- Placement accuracy is suitable even for 01005 and 0201 components
- High placement speed reaching 280 components per PCB
- Excellent performance with small passives, logic ICs, CSPs, and fine-pitch QFNs
Versatile placement with YAMAHA YSM10
For larger ICs and specialized components, we use a YAMAHA YSM10 functional placement machine. It supports:
- Larger SMD components
- Odd-shaped components
- Placement capability of 96 components per PCB
- High/mix/low/medium volume production
Reflow soldering with AOI before and after
To create strong solder joints, all SMT boards pass through multi-zone reflow ovens with carefully controlled thermal profiles tailored to PCB thickness, material, and component specifications.
Before reflow, we run AOI to confirm correct placement. After reflow, another AOI inspection ensures that every solder joint is proper before the boards move to further processes.
X-ray inspection for hidden joints
For SMD components like BGA, LGA, QFN, and CSP, visual inspection is not enough. PCBONLINE uses professional X-ray inspection systems to examine:
- Ball grid array solder joints
- Inner-layer via-in-pad structures
- Voiding analysis
- Hidden electrical connections
The X-ray inspection ensures 100% reliability for high-density assemblies.
FAI (first article inspection) for prototypes
Before mass production begins, we conduct First Article Inspection to ensure the prototype PCBA is qualified. We use the FAI machine to check every component value on the PCBA to ensure it is within the tolerance range.
The FAI guarantees that every detail aligns with customer expectations before large-scale manufacturing proceeds.
THT Assembly: Stable, Strong, and Efficient
Through-hole components require through-hole soldering, which provides mechanical strength and efficient thermal dissipation. PCBONLINE operates four THT assembly lines, each engineered for efficiency and quality.
Our THT process includes:
- Component insertion: Our operators place components through PCB holes and position the PCBA in precision fixtures for wave soldering.
- Wave soldering: The PCBA passes over the solder waves in an automatic wave soldering machine, reliably soldering the THT component leads to the PCB hole walls.
- Lead trimming: After soldering, the component leads on the other side are neatly cut to 1mm to 2mm.
For PCBAs that cannot undergo wave soldering due to heat-sensitive areas, we offer selective soldering to replace wave soldering. Selective soldering enables consistent heating only at required locations and zero thermal damage to nearby components.
Component Warehouse with Quality Control
A stable supply of authentic components is essential for reliable production. PCBONLINE maintains a dedicated component warehouse equipped with:
- Constant temperature and humidity control
- Smart environmental monitoring
- Dedicated MSL (Moisture Sensitivity Level) storage
- X-ray inspection for critical components and ICs before warehousing
- Real-time ERP tracking and barcode management
All purchased components undergo visual and electrical inspection, packaging and label verification, anti-counterfeit checks, and moisture control procedures.
Our controlled storage environment prevents oxidation, moisture absorption, and degradation, ensuring optimal solderability and electrical performance.
Value-Added Services for PCBA
After PCB soldering and assembly, PCBONLINE provides comprehensive value-added services to deliver turnkey PCBA solutions tailored to meet various demands.
Functional testing
We perform functional tests tailored to customer requirements, including power-on testing, signal communication testing, load and stress testing, and real-world operating condition simulation.
Conformal coating
We apply acrylic/silicone/urethane protective layers. Conformal coatings shield PCBAs from moisture, dust, corrosion, and chemicals, ideal for outdoor, automotive, industrial, and harsh-environment applications.
Burn-in (aging) test
For high-reliability products, our burn-in chambers simulate extended operating conditions to detect early-life failures and ensure long-term reliability.
IC programming
We offer professional IC programming and calibration services for microcontrollers, EEPROM, flash memory, and wireless modules.
We can burn firmware before assembly or after PCBA completion, depending on client preference.
Finished device assembly (box-build)
PCBONLINE goes beyond PCBA by offering box-build assembly services. This includes:
- Installation of PCBAs into plastic or metal enclosures
- Integration of displays, connectors, and cables
- Assembly of mechanical hardware
- Full device testing before shipment
We also provide custom enclosure manufacturing through strategic partnerships with the top 3 casing factories in China. Our clients can supply enclosure designs, and we coordinate professional customization.
Partner with PCBONLINE for PCB Assembly and Soldering Services
Since the foundation in 2005, PCBONLINE has been committed to providing turnkey PCB assembly and soldering services for more than two decades and has served terminal and design clients from around the globe, including Fortune 500 companies in automotive, industrial controls, and computer, R&D companies in IoT and AI, and startups in consumer and medical electronics.
Our turnkey OEM PCBA services offer:
- Turnkey PCBA manufacturing: From PCB ptototypes and testing to mass PCBA and box-build assembly, our PCB assembly services are custom and one-stop.
- Complete procurement: We source and customize enclosures, cables, and accessories from reliable suppliers.
- Engineering support: We check enclosure and accessory designs for compatibility with your PCBA and can suggest design changes.
- Free DFM/DFT: We provide free Design for Manufacturability (DFM) and Design for Testability (DFT) checks to ensure that designs are optimized for a smooth production process.
- Quality assurance: IPC-A-610 Class 3, automotive-grade or industrial-grade inspection standards.
- Turnkey delivery: From PCB fabrication to final product packaging and shipping.
PCBONLINE manufactures, assembles, and tests PCBs and PCBAs to box builds as a source factory manufacturer under one roof, from prototypes to bulky production, saving costs and time for you.
We have powerful manufacturing strength for advanced PCBs and high-end assemblies, such as HDI PCBs, high-frequency PCBs, ceramic PCBs, waterproof sealing, and 01005 fine-pitch assembly.
We can precisely control reflow/wave oven temperatures, design PCBA fixtures, and help create user manuals, installation guides, and compliance labels.
Our high-quality PCBA contract manufacturing is certified with ISO 9001:2015, ISO 14001:2015, IATF 16949:2016, RoHS, REACH, UL, and IPC-A-610 Class 2/3.
Our one-on-one free and professional DFM helps you debug and improve design, to ensure the manufacturability, cost-effectiveness, and final device success.
Whether you need turnkey PCB assembly for AI hardware, IoT devices, creative electronic products, medical-grade products, or automotive modules, we can deliver PCBAs of high quality and in time, meeting any of your project requirements. To get a quote for your PCBA project, email us at info@pcbonline.com.
Conclusion
From PCB prototypes to final products, PCBONLINE ensures that your PCBA is assembled under one roof with precision. With more than 20 years of PCB assembly and soldering services, we are ready to check your Gerber and provide turnkey services for you. Contact us today!
PCB assembly at PCBONLINE.pdf
