Explore our high-reliability printed circuit board assemblies engineered for global industries
Established in 2006, Shenzhen STHL has evolved into a premier high-quality provider of Electronics Manufacturing Services (EMS) in China. With nearly 20 years of specialized experience in electronics contract assembly manufacturing, we serve a sophisticated global clientele across the entire industry chain. Our capabilities span from initial PCB layout support and global component sourcing to advanced PCB fabrication, high-precision PCBA assembly, custom cable assembly, box build integration, and rigorous testing protocols.
Operating from our state-of-the-art 10,000 sqm facility in Shenzhen, STHL houses a dedicated workforce of over 220+ highly trained staff members. Our manufacturing footprint is optimized for high-mix, variable-volume production, featuring:
We are proud to serve mission-critical sectors including energy power, communications, automotive, medical, consumer electronics, computer storage, safety & security, and industrial automation. Our global footprint covers the USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, Korea, Thailand, and over 90 other countries and regions.
End-to-end electronics manufacturing services tailored to meet strict regulatory and quality standards
STHL operates 7 automated PCB assembly lines for both rapid prototyping and high-volume production. Advanced SMT ensures precise component placement down to 01005 sizes, while skilled technicians provide efficient THT assembly and RoHS-compliant lead-free soldering.
Our PCB fabrication services produce high-quality, reliable printed circuit boards. From simple single-sided boards to complex multi-layer PCBs, high-density interconnects (HDI), flexible PCBs, and rigid-flex configurations, we utilize premium materials and controlled processes to meet your exact specifications.
STHL offers global electronic component sourcing and supply chain solutions. Our vast, audited supplier network ensures access to genuine, certified parts, mitigating risks of counterfeits, component allocation, and long lead times to secure your production schedule.
With precision manufacturing of cable assembly components including custom wire harnesses, retention systems, specialized connectors, and shielding in a wide range of materials and finishes, we deliver robust connectivity solutions for demanding industrial applications.
Consolidating your project at STHL from SMT assembly to final box build is highly cost-effective and accelerates time-to-market. We cover everything from installing the PCBA into custom enclosures, routing internal wiring, executing full system functional testing, to final packaging.
STHL conducts comprehensive functional testing (FCT) to verify product performance and electrical integrity. By preventing defects such as open/short circuits, missing components, or firmware anomalies, we ensure that every delivered product is stable and fully qualified.
State-of-the-art equipment and specialized processes for high-density, high-reliability assemblies
Modern electronic designs demand extreme component density and microscopic tolerances. At STHL, we handle a wide range of advanced components with high precision, ensuring reliable connections and optimal thermal performance:
Our commitment to quality goes beyond component placement. We utilize advanced inspection techniques, including 3D Automated Optical Inspection (AOI) and high-resolution X-Ray inspection, to guarantee flawless assembly before the boards leave our facility.
Despite the dominance of SMT, Through-Hole Technology remains critical for connectors, power components, and assemblies subjected to high mechanical stress. STHL PCBA excels in THT assembly through a combination of automated and manual processes:
How STHL is adapting to the next generation of high-speed, high-density electronics manufacturing
As electronic components shrink and operating frequencies rise, the demands on PCBA manufacturers intensify. STHL is actively investing in next-generation manufacturing capabilities to support the future of IoT, automotive electrification, and high-frequency communications. Our technical roadmap focuses on three primary pillars:
We are expanding our capabilities to support micro-vias, stacked vias, and line/space widths below 50 microns. This is essential for next-generation 5G/6G modems, smart wearables, and advanced medical diagnostics where space is at a premium.
By embedding passive and active components directly within the internal layers of the PCB, we help clients reduce overall board size, improve signal integrity, and enhance thermal dissipation. Our rigid-flex capabilities are also expanding to meet the needs of dynamic mechanical applications.
We are integrating machine learning algorithms into our 3D AOI and X-Ray systems to predict potential soldering defects before they occur. Additionally, real-time thermal profiling sensors in our reflow ovens ensure optimal thermal distribution for complex, mixed-component boards.
Tailored EMS capabilities designed to meet the unique regulatory and operational demands of key sectors
Modern vehicles rely on complex electronic control units (ECUs), ADAS sensors, and battery management systems (BMS). STHL is IATF 16949 certified, meaning our processes are optimized for zero-defect manufacturing, thermal cycling resilience, and long-term reliability under harsh environmental conditions.
For medical diagnostics, patient monitoring, and laboratory equipment, failure is not an option. Our ISO 13485 certification guarantees strict trace-ability, cleanroom-standard handling, and rigorous validation protocols to ensure patient safety and regulatory compliance.
Industrial environments demand ruggedized PCBs that can withstand vibration, moisture, and extreme temperatures. We provide conformal coating, potting, and heavy-copper PCB fabrication to ensure long-term durability for smart meters, environmental sensors, and gateway controllers.
Time-to-market and cost efficiency are paramount in consumer electronics. STHL supports rapid prototyping (NPI) and seamless scaling to mass production for smart plugs, LED lighting controllers, smart speakers, and home automation hubs.
Leveraging Shenzhen's electronics ecosystem to mitigate risk and optimize production costs
Manufacturing in Shenzhen, the silicon valley of hardware, gives STHL a unique competitive edge. We have built a resilient supply chain that protects our global clients from component shortages, price volatility, and logistics bottlenecks:
Total Cost of Ownership (TCO) Optimization: By combining competitive Chinese manufacturing costs with rigorous Western quality standards, we deliver unmatched value.
IP Protection Protocols: We implement strict data security measures, non-disclosure agreements (NDAs), and isolated network segments to protect our clients' intellectual property throughout the design and manufacturing phases.
Seamless cross-border collaboration backed by international certifications
Navigating international trade, compliance standards, and logistics can be challenging. STHL acts as an extension of your local engineering and procurement teams, ensuring a smooth transition from design to delivered product:
All products manufactured by STHL comply with international environmental and safety standards, including RoHS, REACH, UL 94V-0, and CE/FCC requirements. We provide full documentation packages to support your compliance audits.
Before production begins, our engineers perform a comprehensive DFM review of your Gerber files and BOM. We identify potential manufacturing issues, such as inadequate component spacing or thermal relief problems, saving you time and cost.
We offer flexible shipping terms (FOB, CIF, DDU, DDP) and work with leading global couriers (DHL, FedEx, UPS) and freight forwarders to ensure your assemblies arrive safely, on time, and with all customs clearance handled.
Technical answers to common questions about our PCB assembly capabilities
STHL is certified under IATF 16949 (Automotive), ISO 13485 (Medical Devices), ISO 9001 (Quality Management Systems), and ISO 14001 (Environmental Management). All our manufacturing processes are fully compliant with RoHS and REACH standards.
We support high-mix, variable-volume production. We have no strict MOQ requirements; we can assemble prototype runs of 1 to 10 boards, as well as scale up to mass production runs of hundreds of thousands of units.
We source components directly from authorized global distributors (DigiKey, Mouser, Arrow) and verified original manufacturers. For customer-consigned parts or specialized sourcing, we perform incoming visual inspection, date code verification, and electrical testing to eliminate counterfeit risks.
We offer a comprehensive suite of testing services, including 3D Automated Optical Inspection (AOI), X-Ray Inspection (for BGA and leadless packages), In-Circuit Testing (ICT), and customized Functional Testing (FCT) tailored to your product's firmware and operational parameters.
Explore more high-quality assemblies manufactured in our certified facility
STHL PCBA
