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, STHL brings 20 years of experience in electronics contract assembly manufacturing. Currently, our team consists of 220+ highly skilled staff members. Our 10,000 sqm state-of-the-art facilities house 7 SMT assembly lines, 2 DIP/THT lines, 2 function testing lines, and 2 finished device assembly lines, allowing us to scale production seamlessly from prototyping to high-volume manufacturing.
At STHL, we provide electronics assembly services for energy power, communications, automotive, medical, consumer electronics, computers & storage, safety & security, commercial, and industrial products. Our customers mainly come from the USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, Korea, Thailand, and over 90 other regions worldwide.
As an IATF16949, ISO9001, ISO14001, and ISO13485 certified electronics assembly manufacturer, we produce products that comply strictly with RoHS standards and quality guarantees. Based on our excellent engineering and production capacities in technical areas such as materials analysis & storage, advanced equipment, reliability testing (AOI, X-RAY, ICT test, and function test), and highly effective SMT and THT assembly, we are recognized as a long-term reliable PCBA vendor by customers worldwide.
Delivering precision, reliability, and scalability through state-of-the-art machinery and rigorous quality control protocols.
Surface Mount Technology (SMT) is the backbone of modern electronics. At STHL, we handle a wide range of advanced components with extreme precision, ensuring reliable connections and optimal performance for high-density boards.
For applications requiring high mechanical strength, high power distribution, or robust connections, Through-Hole Technology remains indispensable. STHL excels in THT assembly, combining manual craftsmanship with automated efficiency.
How Shenzhen STHL is driving the next wave of industrial automation, medical devices, and smart mobility across the global supply chain.
From our manufacturing hub in Shenzhen, we export over 75% of our production to highly regulated markets including the USA, Germany, Italy, and Poland. Our compliance with international standards makes us a preferred partner for global OEMs.
Located in the world's electronics capital, STHL leverages a hyper-localized supply chain. We source raw materials, silicon, passives, and enclosures within a 50-mile radius, drastically reducing lead times and buffering against global disruptions.
Our facilities hold IATF 16949 (Automotive), ISO 13485 (Medical Devices), ISO 9001 (Quality Management), and ISO 14001 (Environmental Management) certifications, ensuring compliance with strict global regulatory frameworks.
Shenzhen has evolved from a low-cost assembly hub into a global epicenter for advanced hardware engineering and design. STHL sits at the intersection of this transformation, combining cost-efficient manufacturing with high-end engineering capabilities, design-for-manufacturability (DFM) support, and robust component traceability systems. We serve as the physical realization engine for hardware startups and Fortune 500 companies alike.
End-to-end electronics manufacturing services designed to accelerate your time-to-market while maintaining the highest quality standards.
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 assemblies for customers from various industrial applications.
Making your projects at STHL from SMT assembly to box build assembly is highly 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 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, fully qualified, and ready for immediate deployment.
Staying ahead of the technological curve to support next-generation electronics manufacturing requirements.
The electronics manufacturing landscape is shifting rapidly, driven by the demands of AI, IoT, and green energy. To remain competitive, manufacturers must adapt to new materials, higher component densities, and stricter environmental regulations.
Upgrading SMT lines to support 008004 components and ultra-fine pitch BGAs down to 0.3mm pitch with 100% 3D SPI and AOI coverage.
Implementing MES (Manufacturing Execution System) for real-time tracking, component traceability, and automated process optimization.
Developing specialized processes for heavy copper PCBs, metal-clad PCBs, and advanced thermal interface materials (TIM) for EV and industrial power applications.
Tailored engineering and manufacturing solutions for critical sectors requiring high reliability and performance.
We manufacture safety-critical automotive systems, including Electronic Control Units (ECUs), Heads-Up Displays (HUDs), SRS airbag controllers, and in-vehicle infotainment systems. Our processes comply with IATF 16949 standards, ensuring zero-defect quality and long-term durability under harsh conditions.
Certified under ISO 13485, STHL produces high-reliability PCBAs for medical imaging workstations, portable ultrasound equipment, health monitoring devices, and medical barcode scanners. We implement strict traceability down to the component level and perform rigorous functional testing.
We support the transition to smart grids and industrial automation by manufacturing robust PCBAs for smart meters, power supply systems, and automation equipment. Our designs focus on thermal efficiency, high voltage isolation, and long operational lifespans in demanding environments.
Get answers to common questions about our manufacturing capabilities, quality standards, and supply chain management.
STHL is fully certified under ISO 9001 (Quality Management), ISO 14001 (Environmental Management), ISO 13485 (Medical Devices), and IATF 16949 (Automotive Quality Management). All our manufacturing processes comply with RoHS standards, ensuring lead-free and environmentally friendly production.
We have a robust global supply chain network and source components directly from original manufacturers or authorized distributors (such as Arrow, Avnet, Digi-Key, and Mouser). We perform incoming component inspections, including visual checks, package verification, and electrical testing, to prevent counterfeit parts from entering production.
Yes, our 7 automated SMT lines and dedicated prototype lines allow us to be highly flexible. We support Quick-Turn prototyping for design verification (NPI) and can seamlessly transition to high-volume mass production within the same facility, ensuring consistent quality throughout the product lifecycle.
We employ a multi-layered testing strategy, including 3D Solder Paste Inspection (SPI), 3D Automated Optical Inspection (AOI), X-Ray inspection (for BGA/QFN packages), In-Circuit Testing (ICT), and customized Functional Testing (FCT) to simulate real-world operating conditions before packaging.
Yes, we provide full turnkey box build assembly services. This includes assembling the PCBA into custom plastic or metal enclosures, routing internal cables, installing displays or connectors, performing final system-level testing, and packaging the product so it is ready to ship directly to your end customers.
STHL PCBA
