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Turnkey PCB Assembly Services
SLLPCB provides turnkey PCB assembly services from PCB fabrication and component sourcing to SMT, THT, inspection, testing, and final product assembly. We support prototypes, NPI, low-volume builds, and volume production for complex electronic products.
Our turnkey PCBA service combines PCB manufacturing, global component sourcing, precision assembly, engineering review, and quality control under one supply chain. Customers can provide complete kits, request full turnkey sourcing, or use a hybrid procurement model.
Complete Turnkey PCB Assembly From PCB to Finished Product
SLLPCB manages the complete PCBA manufacturing process through a controlled workflow:
- Gerber, BOM and assembly file review
- PCB fabrication and DFM verification
- Component sourcing and incoming inspection
- SMT and THT assembly
- Reflow, wave or selective soldering
- SPI, AOI and X-ray inspection
- ICT, FCT and functional verification
- Final inspection, packaging and delivery
This integrated approach reduces supplier coordination, component sourcing risks, assembly defects and unnecessary lead time.
PCB Assembly Capabilities
SLLPCB supports both standard and high-density PCB assembly for rigid, flexible and rigid-flex circuits.
| Capability | SLLPCB Capability |
|---|---|
| Assembly Types | SMT, THT, mixed technology, single- and double-sided |
| Component Size | Down to 01005 for advanced applications |
| Fine-Pitch Assembly | Down to 0.25 mm class components, project dependent |
| BGA / QFN / QFP | Supported, including fine-pitch and high-density packages |
| BGA Pitch | Down to 0.25–0.3 mm class, subject to design review |
| PCB Assembly Size | Up to 500 × 500 mm for suitable configurations |
| PCB Layers | Rigid: up to 68; flexible: up to 20; rigid-flex: up to 24 layers for PCB fabrication |
| PCB Types | Rigid, HDI, Flex, Rigid-Flex, Metal Core and High-Frequency |
| Copper Thickness | 1/7–12 oz for PCB fabrication |
| Soldering | Lead-free, leaded, reflow, wave, selective and hand soldering |
| Inspection | SPI, AOI, 3D AOI, X-Ray / AXI and visual inspection |
| Electrical Testing | ICT, FCT, functional testing and programming |
| Value-Added Assembly | Conformal coating, potting, box build and wire harness |
For advanced packages, unusual board geometries or extreme density requirements, our engineering team reviews the design before production.
SMT PCB Assembly
Our automated SMT assembly process supports high-density surface-mount designs, from standard chip components to fine-pitch IC packages.
Supported packages include:
- 01005, 0201, 0402 and larger passive components
- BGA and micro-BGA
- QFN and QFP
- CSP and WLCSP
- SOIC and PLCC
- Package-on-Package (PoP)
- Connectors and other specialized components
Solder paste printing, precision placement and controlled reflow profiles are combined with SPI and AOI inspection to maintain placement and soldering quality.
For designs combining very small and larger components, step stencils and optimized solder paste deposition can be evaluated during engineering review.
THT and Mixed Technology Assembly
SLLPCB supports through-hole assembly for components that require mechanical strength, high current handling or thermal performance.
THT capabilities include:
- Through-hole component insertion
- Wave soldering
- Selective soldering
- Manual precision soldering
- Mixed SMT + THT assembly
- Single- and double-sided assembly
Mixed-technology assembly allows SMT and THT components to be integrated into the same PCBA without requiring multiple suppliers.
BGA, Fine-Pitch and Advanced Package Assembly
High-density electronic products increasingly require fine-pitch components and advanced package technologies.
SLLPCB supports:
- Fine-pitch BGA
- Micro-BGA
- QFN
- QFP
- CSP
- WLCSP
- PoP
- Press-fit components
X-Ray inspection is used for hidden solder joints such as BGA and QFN packages. For demanding designs, our engineering team evaluates pad geometry, component pitch, stencil design, thermal profile and inspection requirements before production.
Turnkey Component Sourcing
SLLPCB offers flexible procurement models for PCBA projects:
Full Turnkey
We source the complete BOM, procure the bare PCB and components, assemble the boards, perform inspection and testing, and deliver the finished assemblies.
Partial Turnkey
Customers provide critical or proprietary components while SLLPCB sources the remaining parts.
Kitted / Consigned Assembly
Customers supply the required components and we perform PCB assembly, inspection and testing.
Our sourcing process includes manufacturer-part-number verification, availability checks, date-code management and incoming inspection to reduce counterfeit and component mismatch risks.
PCB Assembly Inspection and Testing
Quality control is integrated throughout the manufacturing process rather than performed only at final inspection.
Our inspection and testing capabilities include:
- 3D SPI for solder paste inspection
- 3D AOI for component and solder-joint inspection
- X-Ray / AXI for hidden solder joints
- First Article Inspection (FAI)
- In-Circuit Testing (ICT)
- Functional Testing (FCT)
- Electrical verification
- IC programming
- Visual and dimensional inspection
Testing requirements can be defined according to the customer’s test procedures and product specifications.
Advanced PCBA Services
SLLPCB also provides value-added manufacturing services for products requiring more than standard PCB assembly.
Conformal Coating
Acrylic, silicone and polyurethane coating options are available for applications requiring protection against moisture, dust, chemicals and environmental contamination.
Potting and Encapsulation
Potting and encapsulation can be used for electronic modules requiring additional mechanical protection or environmental resistance.
Box Build Assembly
Our box-build capability extends PCB assembly into finished product integration, including enclosure assembly, cable and wire harness integration, heat-shrink processing and related mechanical assembly.
IC Programming
Firmware or device programming can be incorporated into the production process when programming files and test requirements are provided.
Prototype to Volume Production
SLLPCB supports the complete product development cycle from prototype and NPI builds to repeat production and volume manufacturing.
Our manufacturing model is suitable for:
- Engineering prototypes
- NPI builds
- Small-batch production
- Low-to-medium volume manufacturing
- Repeated production
- Volume PCBA
Customers can maintain the same engineering and manufacturing workflow as projects move from prototype validation to production.
PCB Assembly for Complex Applications
Our PCBA capabilities support demanding applications including:
- Automotive electronics
- Medical electronics
- Industrial control
- AI and server systems
- Telecommunications
- Power electronics
- IoT devices
- Consumer electronics
- High-frequency and RF systems
For automotive applications, SLLPCB also provides dedicated automotive PCB assembly with high-reliability materials, HDI, fine-pitch assembly, heavy copper and advanced inspection.
PCB Fabrication + PCBA Under One Supply Chain
Turnkey assembly is more efficient when PCB fabrication and component assembly are managed together.
SLLPCB can combine PCB manufacturing with PCBA using materials and technologies including:
- FR-4 and high-Tg materials
- Rogers and high-frequency laminates
- HDI
- Flexible PCB
- Rigid-Flex PCB
- Metal Core PCB
- Aluminum PCB
- Heavy Copper PCB
- Multilayer PCB
Our PCB manufacturing capability supports prototype through production requirements, allowing customers to manage PCB fabrication and assembly through one manufacturing partner.
Engineering teams can also use our PCB prototyping service for early-stage validation before moving into production.
Quality and Manufacturing Standards
SLLPCB applies documented manufacturing and inspection procedures throughout PCB fabrication and assembly.
Our quality framework supports:
- ISO 9001:2015
- IPC-A-610 Class 2 and Class 3
- RoHS
- REACH
- ESD-controlled manufacturing
- Component traceability
- Batch and date-code tracking
- Process inspection and final verification
For demanding designs, engineering review is performed before production to identify manufacturability, component, assembly and testing risks.
What Files Are Required for a PCB Assembly Quote?
For a fast and accurate PCBA quotation, customers should provide:
- Gerber files
- Bill of Materials (BOM)
- Pick-and-place / Centroid files
- Assembly drawings
- PCB stackup information when applicable
- Component datasheets for special parts
- Testing or programming requirements
- Quantity and target production schedule
Our engineering team reviews the submitted files and identifies missing information or potential manufacturing issues before quotation.
FAQs
What is turnkey PCB assembly?
Turnkey PCB assembly is a complete manufacturing service covering PCB fabrication, component sourcing, assembly, inspection and testing through one supplier.
Do you support SMT, THT and mixed assembly?
Yes. SLLPCB supports SMT, through-hole and mixed-technology PCB assembly, including single- and double-sided placement.
Can I provide my own components?
Yes. Customers can choose full turnkey sourcing, partial turnkey sourcing or consigned/kitted assembly.
Can you assemble 01005 and fine-pitch BGA components?
Yes. Advanced PCB assembly supports 01005 components and fine-pitch BGA/QFN/QFP packages. Final capability depends on the specific component, PCB design, stencil and assembly process.
Do you provide PCB testing?
Yes. SLLPCB provides SPI, AOI, X-Ray, ICT, FCT, functional verification and IC programming according to project requirements.
Can you handle prototype and production quantities?
Yes. SLLPCB supports prototype, NPI, low-volume and production PCBA requirements, with manufacturing processes scalable according to project volume and complexity.
Get a Complete PCB Assembly Solution
Send us your Gerber files, BOM, Pick-and-Place files and assembly requirements. Our engineering team will review your project and provide a PCB fabrication, component sourcing, assembly and testing solution based on your technical requirements.
