Deploying high-reliability electronic assemblies across automotive, medical, industrial, and consumer markets.
Shenzhen STHL is a premier, high-quality provider of electronics manufacturing services (EMS) based in China. We serve customers worldwide along the entire industry value chain, including PCB layout, components sourcing, PCB fabrication, PCBA assembly, cable assembly, box build assembly, and comprehensive functional testing services.
Founded in 2006, STHL has built 20 years of experience in electronics contract assembly manufacturing. Today, STHL operates a 10,000 sqm state-of-the-art facility staffed by 220+ highly skilled professionals. Our production infrastructure consists of 7 automated SMT assembly lines, 2 DIP/THT lines, 2 specialized functional testing lines, and 2 dedicated finished device (box build) assembly lines.
We deliver certified electronics assembly services across critical industries such as energy power, communications, automotive systems, medical equipment, consumer electronics, computer & storage, security systems, and industrial controls. Our global footprint extends across the USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, Korea, Thailand, and over 90 regions globally.
Leveraging vertically integrated manufacturing pipelines to turn conceptual prototype boards into high-yielding, market-ready products.
STHL operates 7 automated PCB assembly lines to support both rapid-turn prototyping and volume production. Our SMT machinery achieves placement precision on fine-pitch components, while skilled technicians oversee lead-free, RoHS-compliant THT soldering.
Our PCB fabrication services span simple single-sided designs to complex multi-layer rigid, flexible, and rigid-flex configurations. Using top-grade raw substrates, we enforce tight impedance and trace tolerances to support high-frequency applications.
Through our established global supply network, we handle end-to-end component procurement. By tracking component lifecycles and utilizing authorized distributors, we mitigate counterfeit risks, long lead times, and allocation bottlenecks.
We assemble high-durability wiring systems, including specialized connectors, overmolding, retention locks, and electromagnetic shielding. Our custom wiring harnesses support demanding industrial, medical, and aerospace systems.
STHL offers complete system integration, packing finished PCBAs into plastic or metal enclosures. From initial SMT to final mechanical assembly, custom labeling, and individual packaging, we provide a streamlined route to market.
To ensure field reliability, every board undergoes rigorous functional testing. Using custom-built test fixtures and automated setups, we verify signal paths, load currents, and firmware boot-ups to prevent field failures.
Exploring our SMT and THT capabilities designed for complex, high-density layouts.
We handle a wide range of advanced components, including Ball Grid Array (BGA) and Ultra-Fine BGA (uBGA), leveraging precise placement systems and automated reflow profiles to secure critical interfaces.
Quality is verified through optical and volumetric inspection, using automated optical inspection (AOI) and 3D X-Ray (AXI) to check for hidden solder bridge defects or voids.
STHL maintains dedicated manual and automated Through-Hole assembly lines, providing mechanical durability for power boards, connectors, and heavy-duty industrial control units.
How our manufacturing infrastructure balances speed, cost, and risk mitigation.
We log every component batch entering our warehouse with a unique barcoded tracking ID. This database ties components directly to production runs, SMT lines, and individual boards, enabling clean component-level traceability.
Our SMT pick-and-place lines feed data directly to our MES (Manufacturing Execution System). We monitor reflow oven temperature profiles, solder paste printing volumes, and component rejection rates in real time to catch defects early.
Our proximity to Shenzhen's primary components market lets us secure hard-to-find components quickly. By maintaining key relationships with direct manufacturers and global distributors, we help shield our clients from sudden market shortages.
Customized PCB assemblies built for specialized operational environments.
Certified under ISO13485, we assemble critical PCBAs for anesthesia machines, patient monitors, and biochemical analyzers. We use specialized testing rigs to confirm every board meets clinical safety standards.
Aligned with IATF16949 guidelines, our lines produce vibration-resistant, high-temperature boards, including On-Board Chargers (OBC), motor controllers, and automotive sensor arrays designed to handle harsh driving conditions.
We assemble smart plugs, high-power switching power supplies, and grid monitoring modules. Through thermal engineering and selective heavy-copper layouts, our boards manage high currents while minimizing thermal loss.
Providing high-frequency SMT placement for high-speed modems, routers, and processing units. We utilize low-loss RF substrates and precise impedance control to ensure signal integrity across RF channels.
Preparing our manufacturing lines for next-generation hardware designs.
As microchips shrink, we continue updating our optical alignment systems and laser drilling support to handle micro-vias, blind vias, and buried vias on dense, multi-layer stackups.
Our engineering team works with designers to place passive and active elements directly within core PCB layers, saving space on the board surface and boosting high-speed signal performance.
We use energy-efficient reflow ovens, lead-free alloys, and clean chemistry washes to reduce the environmental footprint of our PCB manufacturing and assembly operations.
Meeting international standards to ensure reliable delivery to global markets.
We secure customer design files with strict access controls, offline networks for processing sensitive data, and clear non-disclosure agreements (NDAs) to protect customer intellectual property.
Our production practices are fully compliant with RoHS, REACH, CE, and UL standards. We provide material declaration reports to streamline certification for US, EU, and Asian markets.
Our bilingual engineers review your Gerber and BOM files prior to production. Highlighting potential issues early helps minimize manufacturing delays and avoid costly design revisions.
Direct answers regarding lead times, testing practices, and our production capabilities.
From custom sensor arrays to high-power control boards, discover our manufacturing range.
STHL PCBA
