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.
It was established in 2006, with 20 years of experience in electronics contract assembly manufacturing. Currently, STHL has 220+ staff members. Our 10,000 sqm facilities include 7 SMT assembly lines, 2 DIP/THT lines, 2 function testing lines and 2 finished device assembly lines.
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 USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, Korea, Thailand, and other 90 regions of the world.
As an IATF16949, ISO9001, ISO14001, and ISO13485 certificated electronics assembly manufacturer, we produce products exactly complying 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), highly effective SMT and THT assembly, we are recognized as a long-term reliable PCBA vendor by more and more customers worldwide.
As electronic systems grow more compact and computationally complex, Surface Mount Technology (SMT) is moving toward ultra-fine pitch components, heterogeneous integration, and zero-defect quality control. Our manufacturing infrastructure addresses these shifts across various industrial domains.
Meeting IATF16949 standards for electronic control units (ECUs), Electronic Parking Brakes (EPB), and infotainment systems. We address harsh thermal cycles with high-reliability lead-free solder alloys and thick copper PCB processing.
Providing precision SMT assembly for patient monitors, ventilators, and diagnostic interfaces. We offer full traceability down to the component level, cleanroom-equivalent handling, and specialized conformal coating services.
Supporting high-voltage solar inverters, smart grid controllers, and heavy-duty robotic drivers. Our THT and high-power soldering lines are set up to handle large thermal masses and multi-layer thick copper structures.
To produce highly reliable circuit boards, SMT lines must handle complex silicon and passive geometries. We support advanced packaging types through a combination of high-accuracy mounters, solder paste inspection (SPI), and reflow profiling.
Even in an SMT-dominated market, THT remains critical for power supplies, connector interfaces, and heavy-duty industrial controls. We maintain dual DIP/THT lines capable of high-mix, high-reliability lead-free assembly.
We support products from Initial Design for Manufacturability (DFM) reviews to final box-build packaging, helping to speed up time-to-market and simplify supply chains.
We operate 7 automated PCB assembly lines for both prototype runs and high-volume production. Advanced SMT ensures precise component placement, while experienced technicians provide THT assembly and RoHS-compliant lead-free soldering.
Our PCB fabrication services produce high-quality, reliable printed circuit boards, ranging from simple single-sided designs to complex multi-layer boards. We work with rigid, flexible, and rigid-flex substrates, using controlled processes to meet precise specifications.
We provide global electronic component sourcing and supply chain solutions. Our established supplier network helps us procure genuine, certified parts, which reduces the risks of counterfeit components, allocation delays, and long lead times.
We manufacture custom cable and wire harness assemblies using a variety of connectors, retention systems, and shielding configurations to ensure reliable connectivity for demanding industrial environments.
From initial SMT assembly to final mechanical box builds, we offer complete integration services. This includes installing the PCBA into custom enclosures, routing internal cables, and conducting full functional testing to deliver ready-to-use products.
We conduct functional testing (FCT) to verify electrical performance under simulated operating conditions. This step checks for circuit issues and misplaced or incorrect components to ensure stable, reliable boards.
We run full ERP/MES tracking on every batch. Each critical component is logged from receiving to final assembly, minimizing diagnostic times in high-reliability fields like medical and automotive electronics.
Our facilities are audited to meet international standards, including IATF16949 for automotive, ISO13485 for medical devices, ISO9001 for quality management, and ISO14001 for environmental systems.
We maintain buffer stocks of critical microcontrollers, passives, and connectors through partnerships with authorized global distributors. This helps shield customer schedules from sudden supply chain shortages.
As SMT evolves, we continue to upgrade our capabilities to support high-density and high-frequency applications.
We fabricate and assemble PCBs using high-frequency materials (such as Rogers and Taconic laminates) to support millimeter-wave radar and high-speed communication systems.
Our high-speed placement lines are optimized to mount large arrays of ultra-small LEDs on thin, thermally conductive backplanes.
We are integrating AI-based optical inspection systems to automate defect detection and improve yields on high-density boards.
We support environmental initiatives with halogen-free laminates, lead-free surface finishes, and energy-efficient reflow ovens.
STHL PCBA