Who We Are
Engineering Support from Custom PCB Files to Optional PCBA
A Clear Path from Bare PCB to Assembled Board
QueenEMS manufactures custom bare PCBs from customer-supplied Gerber or ODB++, drill, stackup, fabrication drawing, and order requirements. PCBA is an optional downstream service for projects that also need component sourcing, SMT or THT assembly, inspection, testing, and finished-board delivery.
Each project receives engineering review from quotation through delivery. Purchasing teams get a defined scope and revision record, while PCB designers receive clear questions about stackup, materials, controlled impedance, fabrication notes, BOM data, and assembly requirements when they apply.
Ready to review a bare PCB or combined PCB and PCBA project?
Request a QuoteQuality Certified & Audit-Ready
Compliance You Can Verify, Standards You Can Trust
Certification and compliance records help buyers confirm whether a supplier fits the project before files are released. QueenEMS can provide available quality-system and product-compliance documents for procurement review and keep the applicable PCB or PCBA acceptance requirements tied to the order record.
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.
PCB and PCBA Acceptance: Bare-board acceptance and assembly workmanship are reviewed separately. Project documents may reference IPC-A-600 criteria for PCB fabrication and IPC-A-610 criteria for assembled boards, with the required class and customer-specific exceptions confirmed before production.
Need certification documentation for your procurement review?
Request CertificatesCustomization & Engineering Support
PCB Manufacturing First, with PCBA When the Project Needs It
The work begins with the bare PCB: released fabrication data, stackup, material, copper, surface finish, controlled-impedance, and inspection requirements. When PCBA is included, the same approved revision then carries into component sourcing, assembly, testing, and packaging.
Custom PCB Manufacturing & Optional PCBA
Order custom bare PCBs as a standalone scope, or add PCBA when you want component sourcing, SMT or THT assembly, inspection, testing, and packaging linked to the same released board revision.
- Stackup, material, copper, finish, and impedance review
- Custom bare PCB fabrication from released data
- Optional component sourcing, assembly, and testing
- One engineering contact for the approved project scope
Component Sourcing & BOM Management
For PCBA projects, component procurement follows the approved BOM and alternates require customer review. Sourcing and lot information can then remain separate from the bare-PCB fabrication record while both stay tied to the same assembly revision.
- Authorized distributor network access
- Obsolescence management and alternates approval
- Real-time BOM pricing and lead time updates
- Excess inventory return or buyback options
PCB DFM & PCBA DFA Review
PCB DFM begins with board outline, drill and routing data, copper clearances, stackup, materials, surface finish, and panel requirements. For PCBA, the review extends to BOM, centroid data, polarity, pad geometry, placement, thermal concerns, and test access.
- Board outline, drill, annular ring, and copper clearance review
- Stackup, material, impedance, and fabrication-note check
- Pad, polarity, placement, and thermal review for PCBA
- Panelization, test access, and rework-clearance check
Prototype to Volume Scaling
A project can begin with a PCB prototype lot, continue with a small PCBA validation build, and move into repeat production under controlled revisions. Fabrication and assembly quantities do not need to be identical when the purchasing plan calls for spare bare boards or staged builds.
- Prototype bare PCB and PCBA validation lots
- Small-batch PCB manufacturing and assembly
- Controlled transition to repeat production
- Revision and traceability records across order stages
Customized Testing Solutions
Test evidence is matched to the purchased scope. Bare PCB orders may specify electrical-test records, impedance data, microsection reports, or dimensional checks; PCBA projects may add AOI, X-ray, functional testing, or an approved test fixture.
- Bare-board electrical test and inspection records
- Impedance, microsection, or dimensional evidence when specified
- AOI and X-ray inspection for applicable PCBA features
- Functional-test fixture support for approved PCBA procedures
Consignment & Partial Turnkey
For PCBA projects, customer-owned critical components can be supplied as a consigned kit while QueenEMS sources the remaining approved BOM lines. The consigned quantity, acceptable attrition, packaging, and ownership record should be agreed before assembly release.
- Flexible consignment acceptance
- Kitting and inventory management
- Component storage and ESD protection
- Clear segregation and tracking of consigned parts
Share the files for your bare PCB or combined PCB and PCBA project so the engineering scope can be reviewed before quotation.
Schedule Engineering ConsultationPCB Manufacturing & PCBA Order Process
Seven Controlled Steps from Released Files to Delivery
The workflow starts with the released PCB data. Bare-board fabrication and inspection are completed against the approved scope, while component sourcing and assembly steps are activated only when PCBA is included in the order.
PCB or PCBA File Submission & Quote
For a bare PCB quote, send Gerber or ODB++, drill files, stackup or fabrication drawing, quantity, surface finish, material, and test requirements. Add the BOM, centroid file, assembly drawings, approved alternates, and functional-test scope when the order also includes PCBA.
PCB DFM, Stackup & Approval
Engineering reviews the board outline, drill and routing data, copper-to-edge clearance, stackup, laminate, copper weight, controlled impedance, surface finish, and panel method. Any assumption that changes the released data is returned as a question for customer approval before fabrication begins.
Material, Finish & BOM Confirmation
PCB orders proceed only after the material family, thickness, copper, surface finish, impedance notes, and approved substitutions are clear. For PCBA, this stage also locks the BOM, sourcing responsibility, consigned parts, and any alternate manufacturer part numbers before procurement.
PCB Fabrication & Optional SMT/THT Assembly
Bare PCBs are manufactured to the released fabrication data and approved CAM clarifications. When PCBA is part of the order, the accepted board revision then moves into solder-paste printing, SMT placement and reflow, followed by THT or mixed-technology assembly where the drawing requires it.
Bare-Board Inspection & PCBA First Article
Bare-board release uses the inspection and electrical-test evidence defined by the PCB drawing or order. PCBA inspection then checks component presence, polarity, placement, and soldering, with X-ray or first-article records added when hidden joints or the approved control plan require them.
Testing & Production Release
Bare PCB orders are released against the agreed fabrication and inspection records. Assembled boards can follow a customer-supplied functional procedure or an approved fixture plan; any failed test, unresolved deviation, or unapproved file change remains a production hold rather than an informal exception.
Packaging & Documentation Delivery
Bare PCBs and assembled boards are packed according to their moisture, ESD, labeling, and shipment requirements. The documentation package is matched to scope: fabrication and test records for PCB orders, plus component, assembly, inspection, and functional-test records when PCBA is included.
Documentation You'll Receive
Use one approved file and decision record to keep PCB fabrication and any optional assembly scope aligned.
Get Started with Your ProjectTrusted by Industry Leaders Worldwide
PCB Manufacturing and PCBA Support Across Multiple Industries
Projects across industrial automation, power electronics, IoT devices, automotive systems, medical equipment, and consumer electronics may require a bare PCB, an assembled board, or both. The useful starting point is the design requirement: material and stackup for fabrication, then sourcing, assembly, and test controls only where the product needs them.
Industrial
Control OEMs
Power
Electronics
IoT Device
Manufacturers
Automotive
Electronics
Medical Device
Companies
Consumer
Electronics
Global Service Coverage
QueenEMS supports PCB manufacturing and optional PCBA projects for customers in North America, Europe, and Asia-Pacific. Export documentation, packaging, project communication, and the requested compliance evidence are reviewed against the destination and purchasing requirements.
Discuss the PCB or PCBA scope that fits your product and purchasing plan.
Start Your ProjectWhat Our Customers Say
Real Feedback from Global B2B Partners
"QueenEMS delivered exactly what we neededβfast 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 PCB files and add BOM and assembly data only when PCBA is part of the requested scope.
Meet Our PCB Manufacturing and PCBA Support Team
PCB Manufacturing People First, with Dedicated PCBA Support
PCB manufacturing and PCBA require different controls, so this team section separates the bare-board manufacturing people from the optional PCBA support roles. PCB manufacturing handles CAM, production planning, fabrication control, and bare-board quality; PCBA support adds assembly coordination, component sourcing, inspection, and functional-test communication when assembly is included.
PCB Manufacturing Team
Bare-board fabrication, CAM, production planning, quality, and regional customer support
Ben
Production Manager
Oversees bare PCB fabrication flow, panel release, production priorities, and shop-floor coordination for circuit board orders.
Emma
Quality Supervisor
Supervises PCB quality checkpoints, final visual inspection, shipment release evidence, and manufacturing nonconformance follow-up.
Marsha
Production Planner
Plans PCB production schedules, material readiness, process queues, and delivery timing for prototype and volume bare-board orders.
Lee
Circuit Board CAM Engineer
Reviews Gerber, drill, stackup, panelization, impedance, and CAM questions before PCB fabrication release.
Chan
Founder
Guides the PCB manufacturing team on process discipline, customer requirements, and long-term factory capability development.
Lori
Business Director
Connects customer requirements with PCB production capacity, quotation assumptions, delivery commitments, and order priorities.
Vincent
Marketing Manager - Canada
Supports Canada-region customers with PCB project communication, quotation follow-up, and manufacturing status coordination.
Ribery
Head of Sales - Europe
Supports European PCB customers with requirement clarification, quotation coordination, and production communication.
PCBA Support Team
Assembly coordination, component sourcing, inspection, and test support when PCBA is included
Engineering Lead
DFM/DFA Review
Reviews PCB fabrication data, stackup, materials, controlled impedance, and CAM questions, then extends the review to BOM and assembly files when PCBA is included.
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
Coordinates bare-board test and inspection evidence, then adds AOI, X-ray, first-article, or functional-test records for the approved PCBA scope.
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 ProjectPCB & PCBA Production and Testing Capabilities
PCB Fabrication First, with Optional PCBA Support
PCB fabrication is controlled through the released stackup, material, drill, routing, surface-finish, CAM, inspection, and electrical-test requirements described earlier. The equipment below supports the optional PCBA stage, where SMT or THT assembly and assembly-specific inspection are added to the accepted bare board.
PCB Stackup & Lamination
Controlled layup, prepreg selection, copper balance, and press profiles turn the approved stackup into stable multilayer PCB panels.
- FR-4, high-Tg, high-speed, metal-core, and specialty materials
- Stackup review before production release
- Controlled press cycle for flatness and reliability
CNC Drilling & PTH Preparation
Mechanical drilling, deburr, desmear, and hole-wall preparation create the foundation for reliable plated through holes and vias.
- Tooling selected by material, thickness, and hole size
- Drill-to-copper registration checked against CAM data
- Hole-wall quality prepared for copper plating
Circuit Imaging & Etching
Copper patterning, developing, and etching control line width, spacing, and impedance-sensitive routing before solder mask and finish.
- CAM checks for trace, space, annular ring, and copper balance
- Process control for fine lines and heavy copper designs
- AOI review before the next fabrication stage
Bare-Board Electrical Test
Flying probe or fixture testing verifies continuity and isolation before the bare boards are packed or released to optional assembly.
- Netlist-based open and short testing
- Prototype-friendly flying probe setup
- Test records available with production documentation
Solder Mask & Surface Finish
Solder mask registration, legend, and final finish selection protect the copper pattern and prepare the board for soldering, bonding, or long-term storage.
- HASL, lead-free HASL, ENIG, OSP, immersion silver, and hard gold options
- Mask opening and bridge checks for fine-pitch designs
- Finish choice matched to assembly and shelf-life needs
Routing, Profiling & Final QC
CNC routing, V-score, tab routing, visual inspection, and packaging checks make sure the finished bare boards match the approved outline and documentation.
- Board outline, slots, bevels, and panelization verified
- Final visual QC for solder mask, finish, and edge quality
- Vacuum packing, labels, and shipment records prepared
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: Β±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
Bare PCB fabrication is the core workflow; assembly and functional testing are added only when PCBA is included in the approved project scope.
Request Capability DocumentationIndustries We Serve
PCB and PCBA Support Across Multiple Sectors
Each industry places different demands on the bare PCB before assembly begins. Material, copper, stackup, impedance, finish, cleanliness, and traceability shape the fabrication scope; component control, soldering, inspection, and functional testing are added only for PCBA orders.
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.
See a similar application? Share the PCB fabrication requirements and add the assembly scope only if your project needs PCBA.
Contact Our TeamGlobal Delivery & Full Traceability
Complete Documentation and Quality Control at Every Stage
International orders need documentation that matches what was purchased. Bare PCB shipments may require fabrication, material, test, inspection, and conformance records; PCBA shipments may also require component, assembly, first-article, and functional-test traceability.
Component Traceability
For PCBA orders, component records can include the approved manufacturer part number, supplier, lot or date code, and incoming-inspection status. Bare PCB traceability remains a separate fabrication record tied to the same released revision.
- Manufacturer part number verification
- Date code and lot code tracking
- Authorized distributor COCs available
- Component storage conditions logged
Production Records
Production records link the order revision to the applicable PCB fabrication and inspection evidence. When assembly is included, the record can also identify solder materials, process profile, inspection results, and approved first-article evidence.
- Batch numbering and date stamps
- Reflow profile data retention
- First article inspection images
- Process parameters archived
Packaging & Shipping
Packaging is selected for the shipped product: protected stacks or moisture-control packaging for bare PCBs, and ESD-safe packaging for assembled boards. Commercial invoices, packing lists, and available origin or compliance documents are prepared for the destination and order terms.
- 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 About PCB Manufacturing and PCBA
Can I order bare PCBs without assembly?
Yes. Custom bare PCB manufacturing is available as a standalone order; PCBA is optional. For quotation, send the fabrication files, stackup or drawing, quantity, material, copper, finish, impedance, and inspection requirements without adding a BOM or centroid file unless assembly is also required.
What files are needed for a PCB or PCBA quotation?
A bare PCB quote needs Gerber or ODB++, drill data, fabrication drawing or stackup, quantity, material, copper, finish, impedance, and test requirements. A PCBA quote also needs the BOM, centroid or pick-and-place file, assembly drawings, approved alternates, and functional-test scope; missing files are the most common reason a quote cannot be finalized.
Can you source all components, or do I need to provide some?
Component sourcing applies only to PCBA projects. Customers may request full BOM sourcing, provide all parts as a consigned kit, or consign critical ICs while QueenEMS sources the remaining approved lines; the quote should state sourcing responsibility, acceptable alternates, and attrition assumptions.
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. PCB DFM reviews fabrication data such as outline, drill, copper clearance, stackup, material, finish, impedance, and panel notes. DFA is added for PCBA to review BOM, centroid, polarity, pad geometry, placement, thermal concerns, and test access before assembly release.
What certifications and quality standards do you follow?
QueenEMS maintains ISO 9001, ISO 14001, and ISO 45001 certifications and UL file E518360. Project drawings or purchase orders may also specify IPC-A-600 criteria for bare PCB acceptance, IPC-A-610 criteria for PCBA workmanship, and applicable RoHS or REACH documentation requirements.
Tell Us About Your PCB or PCBA Project
Send PCB fabrication files for a bare-board quote, or add BOM, centroid, assembly, and test files when the project also includes PCBA.
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