Explore our industrial-grade, aerospace, medical, and consumer electronics printed circuit board assemblies engineered to meet rigorous international standards.
Established Year
Modern Facility
Skilled Professionals
High-Speed SMT Lines
Shenzhen STHL is a high-quality provider of electronics manufacturing services (EMS) in China. We serve customers worldwide along the whole industry chain including PCB layout, components sourcing, PCB fabrication, PCBA assembly, cable assembly, box build assembly, and comprehensive testing services.
Established in 2006, with 20 years of experience in electronics contract assembly manufacturing, STHL currently operates a 10,000 sqm state-of-the-art facility featuring 7 SMT assembly lines, 2 DIP/THT lines, 2 function testing lines, and 2 finished device assembly lines.
Our surface mount technology lines are optimized to mount a comprehensive range of micro and complex components, ensuring reliable solder joint reliability for high-integrity sectors:
For high reliability, every SMT run integrates rigorous Automated Optical Inspection (AOI) and X-ray inspection to detect hidden micro-voiding beneath BGAs.
For high mechanical stress, heavy-duty power supplies, and extreme environmental electronics, THT remains indispensable. STHL combines automated insertion with manual dexterity to secure components perfectly:
From bare board fabrication to final box build, we manage every phase of the lifecycle under one roof, guaranteeing consistency, speed-to-market, and competitive pricing.
STHL operates 7 automated PCB assembly lines for both prototype and mass production. Advanced SMT ensures precise component placement and quality. Skilled technicians provide efficient THT assembly and RoHS-compliant lead-free soldering.
STHL PCB fabrication service produces high-quality, reliable printed circuit boards from simple singles to complex multi-layers, from flex PCB to rigid-flex PCB, we use premium materials and controlled processes to meet precise specifications.
STHL offers global electronic component sourcing and supply chain solutions. Our vast supplier network and expertise ensure access to genuine, certified parts, mitigating risks of counterfeits, allocation, and long lead times to secure your production schedule.
With the precision manufacturing of cable assembly components including handles, retention systems, connectors, and shielding in a wide range of materials and finishes, we have performed many successful cable assembly for many customers from various industrial applications.
Making your projects at STHL from SMT assembly to box build assembly is very cost-effective and fast to market. Covering everything from putting a PCBA into the enclosure with all functions testing to a complete product assembly packaged and ready for delivery, we supply the full support.
STHL conducts functional testing (FCT) to verify product performance, preventing defects such as circuit issues, missing or incorrect components. This ensures delivered products are stable and fully qualified before leaving our factory floor.
Shenzhen represents the highest concentration of electronics component supply chains in the world. This localized ecosystem brings unmatched competitive benefits.
By leveraging proximity to primary chip component distributors and localized sheet raw materials, we achieve up to 30-40% savings compared to Western fabricators, passing structural cost efficiencies to our clients.
What takes weeks elsewhere is accomplished within days in Shenzhen. The close alignment between engineering offices and high-speed assembly lines reduces New Product Introduction (NPI) cycles to minimal windows.
We combine ISO9001 and IATF16949 methodologies to maintain consistency. Our traceability programs enable us to trace components back to source manufacturers, assuring functional stability.
We deploy specialized manufacturing lines matching the requirements of key sectors demanding extreme operating tolerances.
Manufacturing PCB assemblies that operate reliably under extreme temperature changes, heavy vibrations, and high altitudes. From primary flight displays (PFD) to inertial measurement units (IMUs), we implement heavy copper traces, custom conformally coated finishes, and functional cycling chambers to ensure flawless thermal performance.
New Energy Vehicles (NEVs) demand zero-defect safety systems. We build high-voltage charging units, battery management systems (BMS), and advanced on-board diagnostic boards under strict APQP and PPAP documentation workflows to guarantee structural reliability.
For critical patient monitoring, noise sensors, and laboratory diagnostic tools, we provide trace components sourced directly from original manufacturers, carrying certified certificates of conformance. Every medical PCB complies with IPC Class III production standards.
To power the next generation of smart speakers, lighting arrays, smart gateways, and voice assistants, our high-speed SMT lines place millions of components daily. We execute cost-optimized manufacturing solutions that retain component signal integrity.
As technical requirements evolve, global procurement managers evaluate modern variables beyond standard pricing structures.
Supply Chain Security and Anti-Counterfeit Safeguards: Incorporating genuine silicon integrated circuits requires robust tracing mechanics. At STHL, we implement formal inspection controls, testing the electrical parameters of inbound component batches in ESD-shielded testing chambers.
Sustainability & RoHS Compliance: European and North American regulations necessitate full green compliance. We implement dedicated lead-free soldering paths, utilizing lead-free solder paste configurations to ensure RoHS compliance across our delivery pipelines.
Design for Manufacturability (DFM) Analysis: Before entering manufacturing cycles, our specialized engineers perform complete DFM assessments. We analyze Gerber layups, checking drill hole sizes, trace clearances, thermal dissipation channels, and potential component interferences, reducing the need for costly manufacturing revisions.
High-Mix, Low-Volume Adaptability: Modern product groups demand variable batch options. STHL supports low-volume production runs alongside scale manufacturing lines. This helps tech start-ups test their designs in the market before scaling up production.
Predictable Logistics and Shipping Networks: Working with international freight forwarders, we provide prompt shipping with secure Customs handling, ensuring components arrive at your dock on time.
Key insights addressing standard procurement questions, engineering parameters, and fabrication workflow operations.
A: We require complete manufacturing documentation, which includes your PCB Gerber files (RS-274X format), a structured Bill of Materials (BOM) detailing manufacturer part numbers, designators, and package details, a detailed assembly drawing showing component placement directions, and your functional testing protocols (if FCT testing is required).
A: We operate a robust vendor validation program, sourcing electronics components directly from original component manufacturers (OCM) or authorized franchised distributors. For parts sourced from independent supply channels, we conduct component parameter validation, checking packaging markings, outer dimensions, and electrical signatures in our verification lab.
A: STHL implements multiple testing checks: Automated Optical Inspection (AOI) checks for placement correctness, skew, solder bridges, and component values; X-Ray inspection analyses hidden solder pads below BGAs and QFNs; and Functional Testing (FCT) checks system-level electrical performance using customized fixtures.
A: Yes, STHL offers fully compliant lead-free SMT and THT assembly lines. We use lead-free solder pastes and wave solder alloys containing RoHS-compliant metals. We also provide full compliance certification for your completed production runs.
A: Yes, we provide full-turnkey Box Build assembly. This covers component SMT/THT, mounting boards inside custom metal or plastic enclosures, running internal wiring harnesses, installing exterior interfaces, and executing final product packaging. Our specialized facility handles high-precision consumer, industrial, and medical assemblies.
View our comprehensive range of specialized assemblies engineered for communication systems, smart applications, and harsh industrial environments.
STHL PCBA
