/For Global Electronics Manufacturers/
PCB Assembly
PCBSAIL is a professional PCB assembly manufacturer in China. With advanced SMT and through-hole production lines, strict quality management systems, and experienced engineering teams, we deliver high-quality PCB assembly services for customers across the USA, Europe, and worldwide.
We provide complete PCB manufacturing and assembly solutions for startups, OEMs, medical device manufacturers, automotive electronics suppliers, and consumer electronics brands.
PCB Assembly Manufacturer
From rapid PCB prototyping to full-scale volume production, our PCB assembly factory supports flexible manufacturing with no minimum order quantity.
Whether you require SMT Assembly, Through-hole Assembly, Turnkey PCB Assembly, or Box Build Integration, we can provide reliable production, strict quality control, and fast global delivery.
Our advanced PCB assembly lines support fine-pitch BGA Placement, Multilayer PCB Assembly, lead-free manufacturing. It can reach IPC Class 2 and Class 3 production requirements.
With outstanding manufacturing capacity, we have become a trusted PCB assembly supplier. Our engineering and manufacturing teams are ready to support your project.
Advance Equipment
Our PCB assembly facilities are equipped with modern high-speed SMT production lines.
- 5+ SMT Production Lines
- High-Speed YAMAHA SMT Machines
- AOI Inspection Systems
- X-Ray Inspection Equipment
- SPI Solder Paste Inspection Systems
- Reflow Soldering Lines
- Wave Soldering Systems
- Nitrogen Reflow Process Support
- BGA Rework Stations
- Functional Testing Stations
High Precision SMT Assembly
We supports advanced PCB assembly technologies including:
- 0201 Component Placement
- Fine-Pitch QFQ Assembly
- BGA Assembly
- Micro BGA Assembly
- Fine-pitch BGA: 0.2 mm
- QFP Pitch: 0.15 mm
- Placement Accuracy: < ±30 μm
- Production Speed: up to 60,000 CPH
Fast Turnaround
Time-to-market is important for electronics companies. Our quickturn PCB assembly services support:
- PCB Prototype Assembly In As Fast As 24 Hours
- Expedited Component Sourcing
- Fast SMT Scheduling
- Rapid Engineering Review
- Priority Production Management
PCB Assembly We Offer.
We can provide a comprehensive range of PCB Assembly services from rapid prototyping to full-scale production.
SMT Assembly
SMT Assembly is the most widely used PCB assembly process in modern electronics manufacturing. Our SMT lines support advanced component packages:
- BGA
- QFN
- QFP
- SOIC
- PLCC
- CSP
Through-Hole Assembly
We support both manual and automated through-hole assembly processes, including:
- Manual THT Assembly
- Automated Insertion
- Wave Soldering
- Selective Soldering
Prototype PCB Assembly
We specialize in fast-turn prototype PCB assembly services with rapid engineering review and quick production scheduling. Our prototype assembly services help customers:
- Validate PCB Functionality
- Identify Design Issues Early
- Improve Manufacturability
- Reduce Production Risks
- Accelerate Product Development
Low Volume PCB Assembly
We provide cost-effective low-volume PCB assembly services for small and medium production.
- Lower Upfront Investment
- Faster Production Cycles
- Flexible Design Modifications
- Reduced Inventory Risk
- Efficient Supply Chain Management
High Volume PCB Assembly
We utilize automated SMT production lines, strict process control, and scalable manufacturing systems to support mass production requirements.
- Automated Production Lines
- High-Speed SMT Placement
- Process Standardization
- Stable Quality Control
- Cost Optimization
Turnkey PCB Assembly
We offer complete turnkey PCB assembly services, managing the entire manufacturing process from PCB fabrication to final assembly and testing.
- PCB Manufacturing
- Component Sourcing
- SMT Assembly
- Through-Hole Assembly
- Testing And Inspection
- Final Packaging And Shipping
Full And Partial Consignment PCB Assembly
We support full and partial consignment PCB assembly services.
- Greater Procurement Control
- Reduced Material Costs
- Easier Component Management
- Flexible Manufacturing Arrangements
BGA PCB Assembly
We provide professional BGA PCB Assembly services for high-density electronic products.
- Fine-Pitch BGA Placement
- BGA Reflow Soldering
- X-Ray Inspection
- BGA Rework And Reballing
- Site Preparation And Repair
- Micro BGA Assembly
Box Build Assembly
We provide completed box build assembly services beyond PCB population. We support full product integration and final system assembly.
- Enclosure Fabrication
- Cable Installation
- Wire Harness Assembly
- Mechanical Assembly
- Product Integration
- Labeling And Packaging
- Final Testing
Cable Harness Assembly
We provide customized cable and wire harness assembly services integrated with PCB assembly projects.
- Ribbon Cable Assembly
- Wire Harness Manufacturing
- Discrete Wire Assembly
- Connector Installation
- Signal Cable Integration
Lead-Free PCB Assembly
We can provide environmentally compliant lead-free PCB assembly services. Our lead-free manufacturing process supports:
- Lead-Free Soldering
- Rohs Compliance
- Thermal Profile Optimization
- High Solder Reliability
- Environmental Safety
LED PCB Assembly
We offer specialized LED PCB Assembly services.
- Aluminum PCB Assembly
- Metal Core PCB Assembly
- Ceramic PCB Assembly
- LED Driver Assembly
- High Thermal Conductivity Solution
Flexible and Rigid-Flex PCB Assembly
We support advanced flexible PCB and rigid-flex PCB assembly.
- Reduced Weight
- Space Optimization
- Better Flexibility
- Improved Reliability
- Lower Connector Requirements
PCB Assembly Capabilities | |
Lead Time | Assembly time range from 24 hours to few weeks for standard deliveries |
Parts Source | Full Turnkey, Partial Turnkey, and Consigned/kitted |
Assembly Option | Surface Mount (SMT), Thru-Hole (THT), and Mixed Technology |
Solder Types | Leaded and lead-free (RoHS Compliant) |
Stencils | Laser-cut stainless-steel stencils |
Minimum Order | No Minimum Order. |
Component Size | Smallest Components, BGA, Micro BGA, and Fine Pitch Parts Assembly |
Component Package | Reels, Tube and tray, Cut tape, loose parts, and bulk |
Shape | Rectangular, Circular, Slots and cut-outs, and any Odd Shapes as per requirements |
Board Dimensions | Small, medium, large |
Board Type | Flex and rigid-flex boards |
Design File Format | Gerber RS-274X, BOM (Bill of Materials) (.xls,.csv,.xlsx), Centroid (Pick-N-Place/XY file) |
Sales And Support | Emails, Phone calls, Online Quote Request |
Testing | Flying Probe testing, ICT Testing, Automated Optical Inspection (AOI), Functional Testing, X-ray Inspection |
Oven Profile | Standard and custom |
Other | Mechanical and Electro-Mechanical Assembly, PCB Testing and Programming |
PCB Assembly Features
We deliver high-performance PCB assembly services built around precision manufacturing, flexible production, strict quality control, and advanced engineering support.
Advanced Quality Control System
Quality assurance is integrated throughout every stage of PCB assembly production.
- Automated Optical Inspection (AOI)
- X-Ray Inspection
- Solder Paste Inspection (SPI)
- In-Circuit Testing (ICT)
- Flying Probe Testing
- Functional Testing (FCT)
- Thermal Shock Testing
- Micro-Section Analysis
Professional Engineering Support
Our experienced engineering team supports customers throughout the entire PCB assembly process.
- DFM Analysis
- BOM Review
- PCB Manufacturability Optimization
- Assembly Feasibility Checks
- Component Replacement Recommendations
- Production Process Optimization
Global Component Procurement
We source components from globally recognized and authorized distributors.
- Genuine Components
- Full Traceability
- Stable Supply Chain
- Counterfeit Prevention
- Multi-Supplier Sourcing Strategy
Secure and Confidential Manufacturing
We respect customer intellectual property and manufacturing confidentiality.
- Controlled Production Access
- Secure Engineering Data Handling
- Confidential File Management
- Restricted Document Sharing
PCB Assembly
We follow a comprehensive and highly controlled PCB Assembly process to ensure manufacturing precision, product reliability, and consistent quality across prototype, low-volume, and mass production projects.
Pre-Assembly Preparation
Our engineering team will do DFM analysis.
- Gerber File Verification
- BOM Review And Validation
- Footprint Compatibility Checking
- Assembly Process Evaluation
- Thermal And Layout Analysis
Component Procurement
We source electronic components through trusted global suppliers and authorized distributors.
- Component Sourcing And Purchasing
- Alternative Component Evaluation
- Incoming Material Inspection (IQC)
- Moisture-Sensitive Component Control
Solder Paste Printing
Solder paste is precisely printed onto PCB pads using high-accuracy stencil printing equipment.
- Laser-Cut Stencil Alignment
- Controlled Solder Paste Deposition
- Print Quality Optimization
SPI
After solder paste printing, 3D SPI systems inspect solder paste deposits to verify volume, height, and alignment accuracy.
- Paste Volume Measurement
- Alignment Verification
- Defect Detection Before Assembly
SMT Assembly
Automated pick-and-place machines mount surface mount components onto the PCB with high precision and speed.
Reflow Soldering
The assembled PCB passes through a multi-zone reflow oven where solder paste melts and forms reliable electrical and mechanical connections.
- Thermal Profile Optimization
- Controlled Heating And Cooling
- Nitrogen Reflow (Optional)
First Sample Testing
Before full production begins, first article samples are inspected and tested to verify assembly accuracy and process stability.
- Visual Inspection
- Dimensional Verification
- Functional Validation
AOI
AOI systems automatically inspect the PCB Assembly for visible defects after SMT soldering.
- Missing Components
- Wrong Polarity
- Solder Bridges
- Misalignment
- Insufficient Solder
Through-Hole Component Soldering
For mixed technology PCB assemblies, through-hole components are inserted and soldered.
- Wave Soldering
- Selective Soldering
- Manual Soldering
X-Ray Inspection
X-Ray inspection is used to verify hidden solder joints that cannot be inspected visually.
Testing
We do electrical and functional testing.
- ICT (In-Circuit Testing)
- Functional Circuit Testing (FCT)
- Flying Probe Testing
Shipping
Before shipment, all PCB assemblies undergo final inspection, cleaning, and ESD-safe packaging.
Industries We Have Previously Served
With advanced SMT and Through-Hole Assembly capabilities, strict quality control systems, and flexible production lines, we can offer PCB Assembly solutions from consumer devices to mission-critical industrial and medical systems.
Automotive
We offer PCBA service for Automotive electronics with strict quality standards.
- Automotive ECU Modules
- LED Lighting Control Systems
- Vehicle Communication Modules
- Sensor And Monitoring Systems
- Power Management Electronics
Industrial Automation
Industrial control systems require stable performance, long operational life, and strong resistance to vibration and harsh environments.
- PLC Control Boards
- Industrial Automation Systems
- Motor Control Modules
- Sensor Control Units
- Power Distribution Systems
- HMI Devices
Medical Electronics
Medical electronic devices require highly controlled manufacturing environments, stable quality, and reliable assembly performance.
- Medical Monitoring Devices
- Diagnostic Systems
- Portable Healthcare Equipment
- Imaging System Electronics
- Sensor Control Modules
Consumer Electronics
We support rapid PCB Assembly for a wide range of consumer products.
- Smart Home Devices
- Wearable Electronics
- Audio And Video Systems
- Gaming Peripherals
- Portable Electronic Devices
Telecommunication
Modern communication systems require high-speed signal integrity, precise impedance control, and high-frequency PCB Assembly capability.
- 5G Communication Equipment
- RF Communication Modules
- Networking Switches And Routers
- Wireless Communication Devices
- Fiber Optic Communication Systems
Energy Systems
Power electronics applications require strong solder reliability, thermal management performance, and high-current assembly capability.
- BMS
- Power Supply Control Boards
- Solar Inverter Electronics
- Charging Station Controllers
- Energy Storage Management Systems
Fast Quotation
Our professional sales and engineering teams provide fast PCB quotes and technical support. Simply send us your Gerber files, BOM, and assembly drawings, and we will respond promptly with a competitive solution.
- Gushu Tangxi Second Industrial Zone, Shenzhen
- +86 755 2335 0814
- +86 135 1078 8094
- sales@pcbasail.com
FAQ About SMT Assembly
1. How Much Does PCB Assembly Cost Per Board?
PCB assembly cost depends on board complexity, component count, package types, assembly volume, testing requirements, and sourcing strategy.
For prototype runs, assembly costs often range from $5 to $100+ per board. High-volume production can reduce costs significantly through automation and economies of scale.
Major cost drivers include:
- Number Of SMT Placements
- BGA And Fine-Pitch Components
- Double-Sided Assembly
- Testing Requirements
- Component Procurement
- Lead Time Requirements
2. What Is the Difference Between PCB and PCBA?
A PCB is a bare board without electronic components. A PCBA is a completed board containing soldered electronic components.
PCB Includes:
- Copper Traces
- Substrate Material
- Solder Mask
- Surface Finish
PCBA Includes:
- PCB
- Resistors
- Capacitors
- ICs
- Connectors
- Solder joints
A PCB becomes a PCBA after the assembly process is completed.
3. Do PCB Manufacturers Also Provide Assembly?
Yes. Many manufacturers now offer turnkey services covering both fabrication and assembly.
4. What Files Are Required for PCB Assembly?
Most assemblers require several manufacturing files.
- Gerber Files
- BOM (Bill Of Materials)
- Centroid/Pick-And-Place File
- Assembly Drawings
- Schematic PDF
- Test Requirements
5. Why Am I Getting Solder Bridges?
Solder bridging occurs when solder unintentionally connects adjacent pads.
Common Causes Include:
- Excessive Solder Paste
- Poor Stencil Design
- Misaligned Components
- Improper Reflow Settings
- Fine-Pitch Spacing Issues
To Reduce Bridging:
- Optimize Stencil Apertures
- Improve Print Quality
- Verify Placement Accuracy
- Adjust Reflow Profiles
Inspection should focus on fine-pitch ICs and QFN packages.
6. What Stencil Thickness Should I Use?
Stencil thickness depends on the smallest component and package pitch.
Typical Recommendations:
Application | Thickness |
Fine Pitch SMT | 0.08 mm (3 mil) |
General SMT | 0.10 mm (4 mil) |
Mixed Technology | 0.12 mm (5 mil) |
Large Components | 0.15 mm (6 mil) |
A thicker stencil deposits more solder but increases bridging risk.mA thinner stencil improves fine-pitch printing but may create insufficient solder joints.
Most standard SMT assemblies use 0.10 mm (4 mil) stencils.
7. How Much Solder Paste Is Enough?
The goal is not maximum solder volume. The goal is the correct solder volume.
Too Much Solder Can Cause:
- Bridging
- Solder Balls
- Component Floating
Too Little Solder Can Cause:
- Opens
- Weak Joints
- Reliability Problems
Stencil aperture design controls paste volume more effectively than changing stencil thickness alone.
8. Why Are Components Tombstoning?
Tombstoning occurs when one end of a component lifts during reflow. The component stands vertically on one pad.
Common Causes:
- Uneven Solder Paste Volumes
- Pad Size Imbalance
- Uneven Heating
- Component Placement Offset
Small passive components such as 0201 and 01005 packages are particularly susceptible.
Balanced pad design and optimized thermal profiles can reduce tombstoning risk.
9. What Is the Ideal Reflow Profile?
There is no single ideal reflow profile.
The Profile Depends On:
- PCB Thickness
- Component Types
- Solder Alloy
- Thermal Mass
A Typical Reflow Process:
- Preheat Zone: Gradually increases temperature.
- Soak Zone: Activates flux and equalizes temperatures.
- Reflow Zone: Melts solder alloy.
- Cooling Zone: Forms reliable solder joints.
10. How Hot Should Lead-Free Solder Get?
Most lead-free assemblies use SAC305 solder.
- Typical Peak Temperatures Range From: 235°C to 250°C
- Most Manufacturers Target: 240°C to 245°C
Excessive temperatures may damage components. Insufficient temperatures can cause cold joints or poor wetting
Thermocouple profiling is recommended for process validation.
11. Why Are My Solder Joints Dull?
Dull solder joints are not always defective. Lead-free solder naturally produces a matte appearance.
However, Dull Joints May Indicate:
- Oxidation
- Poor Wetting
- Contamination
- Incorrect Reflow Settings
Engineers Should Evaluate:
- Joint Geometry
- Fillet Quality
- Wetting Performance
Appearance alone should not determine solder quality.
12. How Fast Can PCB Assembly Be Completed?
Lead times depend on complexity and component availability.
Typical Timelines Are:
Production Type | Lead Time |
Prototype | 24–72 hours |
Quick Turn | 3–7 days |
Standard Production | 1–3 weeks |
High Volume Production | 2–6 weeks |
Component shortages often become the largest schedule risk.
For urgent projects, component availability should be confirmed before design release.