Who We Are
Your Direct Factory Partner for Professional PCB Assembly
Direct Factory Connection, Global Quality Standards
As a China-based PCB assembly factory operating under the B2B direct model, we eliminate middlemen delays and communication gaps that frustrate international procurement teams. Our facility specializes in SMT assembly, THT assembly, and mixed-technology PCBA services, delivering production-grade quality with engineering precision.
Every project receives dedicated engineering support from quotation through delivery. We serve purchasing managers, project coordinators, PCB design engineers, and factory planners across North America, Europe, and Asia—teams who demand transparency, traceability, and on-time performance.
Ready to streamline your PCB assembly sourcing?
Request a QuoteQuality Certified & Audit-Ready
Compliance You Can Verify, Standards You Can Trust
Our certifications aren't wall decorations—they're your assurance that every board meets international quality standards and industry-specific requirements. We maintain full compliance documentation and welcome customer audits, providing the transparency global B2B buyers demand.
Verification Available: All certification documents can be provided in scanned format for your procurement records. We maintain traceability documentation for every production batch and support customer facility audits with advance scheduling.
IPC Standards Adherence: Our production processes follow IPC-A-610 workmanship standards, with trained inspectors ensuring Class 2 (dedicated service electronics) or Class 3 (high-reliability) acceptance criteria as specified in your project requirements.
Need certification documentation for your procurement review?
Request CertificatesCustomization & Engineering Support
Beyond Assembly: Your Engineering Partner for Project Success
We don't just populate boards—we help you optimize designs for manufacturability, source hard-to-find components, and scale from prototype validation to volume production. Our engineering team serves as an extension of yours, preventing costly rework and ensuring first-time-right results.
Turnkey PCBA Solutions
Full-service assembly from bare PCB to tested final product. We procure all components, manage inventory, and deliver finished boards ready for integration—eliminating your supply chain complexity.
- Complete BOM sourcing with authorized distributors
- PCB fabrication coordination
- Assembly, testing, and packaging
- Single point of contact for entire process
Component Sourcing & BOM Management
Transparent procurement with full traceability. Every component is verified against your approved BOM—no unauthorized substitutions. You receive batch documentation showing exact part sources and lot codes.
- Authorized distributor network access
- Obsolescence management and alternates approval
- Real-time BOM pricing and lead time updates
- Excess inventory return or buyback options
DFM/DFA Engineering Review
Pre-production design analysis catches manufacturability issues before they become expensive problems. Our engineers review your Gerber files, BOM, and assembly drawings to identify potential defects, yield risks, and cost optimization opportunities.
- Pad size and spacing validation for assembly
- Component placement optimization
- Thermal management review
- Testability and rework accessibility check
Prototype to Volume Scaling
Start with 5-piece prototype builds for design validation, then seamlessly scale to production volumes without changing suppliers. Same engineering team, same quality processes, same traceability—just higher quantities.
- Low-cost prototype runs (5-50 pieces)
- Small batch production (50-500 pieces)
- Mid-volume production (500-5000 pieces)
- Consistent quality across all volumes
Customized Testing Solutions
Standard AOI and X-ray inspection included. Need functional testing, burn-in, or application-specific validation? We develop custom test fixtures and procedures matched to your product requirements and acceptance criteria.
- AOI (Automated Optical Inspection) standard
- X-ray inspection for BGA and hidden joints
- Custom functional test fixture development
- Burn-in and environmental stress testing
Consignment & Partial Turnkey
Already have critical components in inventory? We accept consignment parts while sourcing the remaining BOM items. You maintain control over key components while we handle procurement complexity for commodity parts.
- Flexible consignment acceptance
- Kitting and inventory management
- Component storage and ESD protection
- Clear segregation and tracking of consigned parts
Let's discuss how our engineering team can support your specific project needs.
Schedule Engineering ConsultationQuality Control & Order Process
Seven Steps to Delivery Certainty
Transparency at every stage eliminates surprises. Our structured process ensures you know exactly what's happening with your boards, from initial file review through final shipment. No unauthorized changes, no hidden substitutions—just clear communication and documented quality.
File Submission & Quote
Upload your Gerber files, BOM (with manufacturer part numbers), Pick & Place data, and assembly specifications. Our team reviews for completeness within 24 hours and provides a detailed quote including component lead times, any obsolete parts requiring alternates, and production timeline. You receive transparent pricing—no hidden fees for "engineering time" or "setup charges" buried in unit costs.
DFM/DFA Review & Feedback
Before ordering components, our engineering team performs Design for Manufacturability and Assembly analysis. We identify potential issues: inadequate pad sizes, components too close to board edges, thermal relief concerns, or testability limitations. You receive a comprehensive report with flagged issues, severity ratings, and recommended corrections—allowing you to make informed decisions about design changes before committing to production.
BOM Verification & Procurement
Component sourcing begins only after your explicit BOM approval. If substitutions are necessary due to obsolescence or stock issues, we present alternates with datasheets for your review—never making unauthorized changes. All components are procured from authorized distributors with full traceability documentation. You receive procurement updates showing which parts are in stock, which are on order, and expected arrival dates.
SMT/THT Assembly Execution
Boards enter production following your approved assembly drawings. SMT placement uses automated pick-and-place machines with SPI (Solder Paste Inspection) verification before reflow. THT components are hand-placed and wave-soldered or selectively soldered based on board design. Mixed-technology boards receive both processes in sequence, with careful handling to protect previously assembled components.
AOI/X-ray & First Article Inspection
Every board undergoes Automated Optical Inspection to verify component presence, polarity, and placement accuracy. Critical assemblies receive X-ray inspection for BGA void analysis and hidden solder joint verification. The first completed board (First Article) is photographed from multiple angles and measured against your specifications before full batch assembly continues—giving you visual confirmation that production matches your requirements.
Functional Testing & Burn-In
If your specification includes functional testing, we execute your provided test procedures or develop custom test fixtures. Boards can undergo power-on verification, signal integrity checks, or full application-specific testing based on your requirements. Environmental stress testing (burn-in, thermal cycling) is available for high-reliability applications requiring infant mortality screening.
Packaging & Documentation Delivery
Finished boards are packaged per your specifications (ESD bags, vacuum-sealed, custom labeling). Each shipment includes comprehensive traceability documentation: Certificate of Conformance, incoming component batch numbers, assembly date codes, test records, and inspection reports. You receive a complete quality package enabling full backward traceability if field issues arise—critical for regulated industries and warranty claims.
Documentation You'll Receive
Experience a manufacturing process designed around transparency and accountability.
Get Started with Your ProjectTrusted by Industry Leaders Worldwide
Serving B2B Customers Across Multiple Industries
We've built long-term partnerships with companies across industrial automation, power electronics, IoT devices, automotive systems, medical equipment, and consumer electronics. Our customers trust us to deliver consistent quality, transparent communication, and reliable on-time performance for their PCB assembly projects.
Industrial
Control OEMs
Power
Electronics
IoT Device
Manufacturers
Automotive
Electronics
Medical Device
Companies
Consumer
Electronics
Global Service Coverage
Our PCBA services reach customers in North America (USA, Canada), Europe (Germany, UK, France, Netherlands, Italy, Spain), and Asia-Pacific (Japan, Singapore, Australia, South Korea). We understand regional compliance requirements, shipping logistics, and documentation standards for each market we serve.
Join our network of satisfied global customers.
Start Your ProjectWhat Our Customers Say
Real Feedback from Global B2B Partners
"QueenEMS delivered exactly what we needed—fast turnaround on prototypes without compromising quality. Their engineering team caught a potential issue in our BOM before production started, saving us weeks of rework."
"Consistent delivery schedules and transparent communication throughout the entire process. They never made unauthorized component substitutions, which is critical for our medical device certifications."
"We've worked with several PCBA suppliers, but QueenEMS stands out for their responsive project management. Questions get answered within hours, not days, which keeps our development timeline on track."
Get Your Project Quote
Upload your files and receive a detailed quotation within 24 hours.
Meet Our Engineering Team
Expert Support at Every Project Stage
Behind every successful PCB assembly project is a dedicated team of engineers, quality specialists, and project coordinators. We assign a primary contact to your account who understands your requirements, communicates proactively, and ensures nothing falls through the cracks from quotation to delivery.
Engineering Lead
DFM/DFA Review
Analyzes design files for manufacturability issues, recommends optimizations, and coordinates technical clarifications with your team.
Project Manager
Timeline & Coordination
Your primary contact for production scheduling, component lead times, and shipment coordination. Available via email, WhatsApp, or WeChat.
Quality Manager
Inspection & Testing
Oversees AOI, X-ray inspection, and functional testing protocols. Provides first article inspection reports and batch traceability documentation.
Procurement Lead
Component Sourcing
Manages BOM verification, component sourcing from authorized distributors, and provides real-time updates on part availability and pricing.
How We Communicate
Work with a team that values clear communication and accountability.
Discuss Your ProjectProduction Equipment & Testing Capabilities
Advanced Manufacturing Systems for High-Reliability PCBA
Our facility operates multiple SMT production lines, supporting both high-speed placement for standard components and precision placement for fine-pitch ICs and BGA packages. Every assembly passes through automated inspection systems before shipping, ensuring consistent quality across prototype and production volumes.
SMT Production Lines
High-speed automated pick-and-place machines with vision alignment for accurate component placement, supporting 0201 chip components and fine-pitch QFP/BGA packages.
- Placement accuracy: ±0.025mm
- Capacity: 50,000 CPH per line
- Component range: 0201 to large connectors
AOI Inspection Systems
Automated Optical Inspection verifies component presence, polarity, placement accuracy, and solder joint quality on every board before final testing.
- Post-reflow inspection for all assemblies
- Defect detection: missing parts, tombstones, bridges
- SPC data collection for process monitoring
X-ray Inspection
Non-destructive X-ray analysis for BGA solder joints, QFN packages, and hidden connections that cannot be inspected visually.
- BGA void analysis and measurement
- Required for high-reliability applications
- 2D/3D imaging capabilities
Reflow Soldering Systems
Nitrogen-atmosphere reflow ovens with multi-zone temperature profiling for lead-free and leaded solder processes.
- 8-10 heating zones for precise profiles
- Nitrogen atmosphere option for oxidation reduction
- Profile optimization for thermal-sensitive components
Wave Soldering & THT
Through-hole component assembly via selective soldering or wave soldering, depending on mixed-technology board requirements.
- Supports mixed SMT/THT assemblies
- Selective soldering for sensitive areas
- Manual insertion for specialized connectors
Functional Test Fixtures
Custom test fixture development for application-specific functional testing, power-on verification, and burn-in procedures.
- Flying probe testing for prototypes
- Custom pogo-pin fixtures for production
- Environmental stress testing available
Our equipment capabilities support your quality requirements.
Request Capability DocumentationIndustries We Serve
Specialized PCBA Solutions Across Multiple Sectors
Different industries demand different assembly standards, testing protocols, and documentation requirements. Our experience across industrial automation, power systems, IoT devices, automotive electronics, medical equipment, and consumer products gives us the flexibility to adapt our processes to your industry's unique needs.
Industrial Control
PLCs, motor drives, sensors, and industrial automation systems. Common requirements: extended temperature range, conformal coating, IPC Class 2/3 standards, and long product lifecycles requiring component traceability.
Power Electronics
Power supplies, inverters, battery management systems, and charging infrastructure. Assembly considerations: high-current PCB designs, thermal management, thick copper layers, and high-voltage isolation testing.
IoT & Connected Devices
Wireless sensors, gateways, edge computing devices, and smart home products. Key challenges: RF circuit assembly precision, antenna placement verification, low-power design validation, and FCC/CE compliance documentation.
Automotive Electronics
Aftermarket accessories, telematics, ADAS components, and vehicle control modules. Requirements: automotive-grade components (AEC-Q qualified), PPAP documentation, IATF 16949 familiarity, and rigorous environmental testing.
Medical Devices
Diagnostic equipment, patient monitoring systems, and laboratory instruments. Critical factors: ISO 13485 quality system alignment, IPC Class 3 workmanship, component obsolescence management, and design change control procedures.
Consumer Electronics
Smart devices, wearables, audio equipment, and home appliances. Focus areas: cost optimization, high-volume capacity, aesthetic assembly quality (visible boards), rapid NPI support, and flexible production scaling.
Find your industry? Let's discuss your specific assembly requirements.
Contact Our TeamGlobal Delivery & Full Traceability
Complete Documentation and Quality Control at Every Stage
When you ship electronics internationally, you need more than just assembled boards—you need documentation proving component authenticity, process compliance, and production traceability. Our quality system generates complete batch records for every order, providing the backward traceability your customers, auditors, or certification bodies may require.
Component Traceability
Every component in your assembly is documented with manufacturer, lot code, date code, and supplier information. We maintain incoming material inspection records and can provide certificates of conformance from authorized distributors.
- Manufacturer part number verification
- Date code and lot code tracking
- Authorized distributor COCs available
- Component storage conditions logged
Production Records
Each production batch receives a unique identifier linking boards to specific production dates, equipment used, solder paste lot, reflow profiles, and inspection results. First article inspection photos are archived for reference.
- Batch numbering and date stamps
- Reflow profile data retention
- First article inspection images
- Process parameters archived
Packaging & Shipping
Boards are packaged according to IPC standards in ESD-safe materials. We provide commercial invoices, packing lists, certificates of origin, and shipping documentation required for customs clearance in your destination country.
- ESD-safe packaging materials
- Vacuum-sealed or moisture barrier bags
- Custom labeling per your requirements
- International shipping documentation
Standard Documentation Package
Conformance
(AOI/X-ray/Functional)
Source List
Records
Need specific documentation for compliance or customer audits?
Request Custom DocumentationISO 9001 Certified
Quality management system ensures consistent processes
Fast Turnaround
Prototype to production with flexible scheduling
98% On-Time Delivery
Reliable production schedules you can plan around
Global Shipping
Export experience to 30+ countries worldwide
Frequently Asked Questions
Common Questions from International B2B Customers
What is your minimum order quantity for PCB assembly?
We support projects starting from 5 pieces for prototypes. There is no strict MOQ—we work with early-stage development teams needing small validation runs as well as production orders ranging from hundreds to thousands of pieces. Pricing becomes more competitive at higher volumes, but we never turn away small batches that help customers validate designs before committing to larger production.
How long does it take to get a quotation?
For standard PCB assembly quotes (SMT/THT with common components), you'll receive a detailed quotation within 24 hours of submitting complete files (Gerber, BOM, and assembly drawings). Complex projects requiring DFM analysis, custom test fixtures, or hard-to-source components may take 1-2 additional business days as we verify component availability and manufacturing feasibility.
Can you source all components, or do I need to provide some?
We offer both turnkey (full component sourcing) and consignment (you provide some or all parts) assembly. Many customers prefer turnkey for convenience, while others consign critical or proprietary components they've already purchased. We're flexible and can work with partial consignment—you supply key ICs while we source passives and connectors, for example. All sourced components come from authorized distributors with traceability documentation.
What happens if a component is obsolete or out of stock?
We never make unauthorized substitutions. If a component on your BOM is obsolete or has extended lead times, our engineering team will identify suitable alternates and present them to you with datasheets for approval before proceeding. You make the final decision on any substitution. This policy protects your design integrity and ensures your boards match your tested BOM.
Do you provide DFM review before production?
Yes, DFM (Design for Manufacturability) and DFA (Design for Assembly) review is included for all projects. Our engineering team analyzes your Gerber files and BOM to identify potential issues: inadequate pad sizes, components too close to board edges, insufficient clearances, or testability concerns. You receive a comprehensive report within 24-48 hours of file submission, allowing you to make informed decisions about design changes before committing to production.
What certifications and quality standards do you follow?
Our facility is ISO 9001:2015 certified for quality management. We follow IPC-A-610 Class 2 workmanship standards as default, with Class 3 (high-reliability) available for applications requiring stricter acceptance criteria. All assemblies are RoHS and REACH compliant. We maintain comprehensive traceability documentation and can support customer audits with advance scheduling.
Tell Us About Your PCBA Project
Get a customized quote within 24 hours. Our team is ready to help you find the perfect solution for your needs
Email Us
[email protected]
Response within 12 hours
Call / WhatsApp
+86-0755-363091328
Mon - Sat, 9AM-6PM CST
Visit Our Factory
1-4/F Property Office Building, ZhengFeng North Road, Shenzhen, China. 518103
Visit Our Office
(Head Office)1/27, Soi Border 5, Bang Bon Tai,Bang Bon, Bangkok 10150,Thailand