Explore our diverse capabilities in complex board design, high-frequency layouts, and robust system configurations.
Years of EMS Expertise
State-of-the-Art Factory
Skilled Professionals
Regions Supported Globally
Shenzhen STHL is a premier high-quality provider of Electronics Manufacturing Services (EMS) in China. We serve customers worldwide along the entire industry value chain. Our comprehensive solutions include PCB layout, precise component sourcing, high-density PCB fabrication, fast PCBA assembly, complex cable assembly, box build integration, and exhaustive testing protocols.
Established in 2006, STHL has built a 20-year legacy of excellence in contract electronics assembly manufacturing. Our advanced 10,000 sqm production facility currently houses 220+ highly skilled staff members. To meet the demanding lead times of global enterprises, we run 7 high-speed SMT assembly lines, 2 DIP/THT lines, 2 functional testing lines, and 2 final product box-build lines.
We deliver top-tier board assemblies for energy power, communications, automotive, medical, consumer electronics, computer storage, security systems, and high-precision industrial systems. Our client footprint spans key global markets including the USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, South Korea, Thailand, and over 90 other countries.
Modern circuits require advanced component densities and micro-fine configurations. At STHL, our automated placement systems tackle the most demanding component classes in the industry:
For power electronics, high-vibration systems, and mechanical interfaces, Through-Hole Technology remains a critical pillar of rugged design. STHL supports hybrid assemblies with comprehensive THT workflows:
Understanding supply chain resilience, engineering verification, and manufacturing standards for critical hardware.
We actively combat component obsolescence and counterfeit entry. Our procurement team works with authorized global distributors (Mouser, DigiKey, Arrow) and audited local networks, using internal X-ray validation to guarantee 100% genuine components.
Before releasing boards to production, our engineers perform a complete Design for Manufacturability (DFM) assessment. We review solder mask clearances, trace widths, thermal relief pads, and panel margins to prevent line stoppages and boost yields.
Our dedicated NPI (New Product Introduction) channels allow quick prototype validation. This provides engineers with physical, fully functional units to test programming and circuit layouts before proceeding to automated volume production lines.
High-reliability manufacturing tailored to specialized industry standards and regulatory compliance.
Operating under IATF 16949 standards, we manufacture critical automotive electronics like Fly-by-Wire control units and Head-Up Displays (HUDs). Automotive PCBs demand void-free soldering, rigorous thermal profiling, and protective conformal coating to withstand high thermal cycling and mechanical vibration.
For life-critical and diagnostic hardware such as pacemakers and biochemical analyzers, STHL operates under a strict ISO 13485 Quality Management System. We guarantee complete lot traceability, device history records, and 100% functional testing to prevent failure in the field.
Industrial clean energy hardware, including Solar Street Light Controllers and high-voltage Energy Storage System (ESS) controllers, requires robust copper layout handling. We assemble high-thickness copper PCBs that manage elevated currents while retaining thermal stability.
From high-speed modems and networked NVR surveillance boards to smart IoT outlets, we handle high-frequency impedance-controlled boards. We control signal integrity through precise material selection and controlled-dielectric layer processing.
From board fabrication to final packaging, we manage every phase of your product's manufacturing lifecycle.
With 7 automated SMT lines and dedicated DIP lines, STHL manages high-density layouts and structural lead-free soldering processes, meeting IPC-A-610 Class II and Class III standards.
Our PCB fabrication services supply rigid, flex, and rigid-flex multilayer boards. We focus on tight impedance control, high aspect ratio microvia drilling, and premium surface finishes.
Our strong supply network prevents production delays. We source raw components directly from verified manufacturers and global distributors, offering end-to-end BOM traceability.
We build custom cable and wire harness setups featuring shielding, robust overmolding, and precise connectors to secure internal interfaces in complex box-build systems.
Go from bare board to retail-ready packaging. We integrate your PCBA into custom plastic or metal enclosures, install subassemblies, and run complete functional validation.
We use customized ICT fixtures, functional testing rigs, and boundary-scan setups to verify every circuit connection, ensuring all outgoing units are fully qualified.
Meeting the demands of next-generation hardware through innovation and process refinement.
A quality-first approach to ensure traceablity, ecological compliance, and global entry.
Automotive Standard
Medical Devices
Quality Systems
Environmental Standards
Get authoritative answers on fast PCBA manufacturing, design reviews, and testing protocols.
To provide an accurate and rapid quote, we require your PCB Gerber files (RS-274X or ODB++ format), a complete Bill of Materials (BOM) in Excel format containing manufacturer part numbers (MPN), quantities, and designators, along with assembly drawing files and coordinate files (Pick and Place files).
We maintain a dedicated global sourcing department linked to major verified electronics distributors. When shortages arise, our engineers suggest alternative components or package replacements for your review, helping to maintain your production schedule without redesigning the PCB.
Yes, we assemble complex multilayer PCBs up to 32 layers. We specialize in handling high-density interconnect (HDI) structures, blind and buried vias, impedance control, and fine-pitch BGA or QFN packages down to 0.3mm pitches.
Absolutely. Our production lines feature lead-free wave soldering, selective soldering, and reflow ovens. All components, solder paste, and fluxes used in these runs comply with international RoHS and REACH environmental guidelines.
We offer a comprehensive testing suite, including visual inspection (MVI), Automated Optical Inspection (AOI), 3D X-Ray inspection for BGA packages, In-Circuit Testing (ICT), and full custom Functional Testing (FCT). This process ensures that every board meets your functional specifications before shipment.
A detailed look at our custom assembly solutions for industrial control systems, medical equipment, and computing devices.
STHL PCBA
