Explore our specialized, high-tier PCB assembly capabilities engineered for global industrial, automotive, and medical standards.
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A Premier Contract Electronics Manufacturer with 20 Years of Technical Heritage.
Shenzhen STHL is a leading provider of high-quality electronics manufacturing services (EMS) in China. We serve customers worldwide along the entire industry chain, offering unified services including PCB layout, component sourcing, PCB fabrication, PCBA assembly, cable assembly, box build assembly, and comprehensive test suites.
Established in 2006, STHL has built 20 years of experience in electronics contract assembly. Currently, STHL employs 220+ skilled staff members. Our 10,000 sqm modern facility hosts 7 SMT assembly lines, 2 DIP/THT lines, 2 functional testing lines, and 2 finished device assembly lines.
As an IATF16949, ISO9001, ISO14001, and ISO13485 certified electronics assembly manufacturer, we produce products that strictly comply with RoHS standards. Built upon our strict materials analysis, controlled storage, advanced instrumentation, and reliability testing (AOI, X-RAY, ICT, and FCT), STHL is recognized as a dependable PCBA partner by customers in over 90 regions.
From raw design files to tested, packaged, and retail-ready finished electronic products.
STHL operates 7 automated PCB assembly lines supporting both prototype and high-volume mass production. Advanced SMT machinery ensures precise component placement, while skilled technicians provide efficient THT assembly utilizing lead-free, RoHS-compliant soldering processes.
We deliver high-density, multi-layer printed circuit boards manufactured with high-grade copper clads and surface finishes. Our fabrication scope covers single-sided, double-sided, multi-layer rigid boards, flexible PCBs (FPC), and complex rigid-flex boards designed for demanding mechanical fits.
Eliminate risk through verified supply chain management. STHL provides global electronic component sourcing, tapping into factory-authorized distributors (DigiKey, Mouser, Arrow, Avnet) and reliable domestic channels to mitigate counterfeit risks, part allocation, and supply chain delays.
We construct customized cable harnesses, multi-conductor wire assemblies, and heavy-duty interface cables. Our capabilities feature precise termination, overmolding, complex retention systems, shielding, and continuous continuity testing for stable industrial performance.
Consolidate your assembly process by routing boards directly into final systems. We handle plastic or metal housing installations, sub-assembly integration, user interface connections, firmware programming, functional verification, and customized retail packaging.
We configure custom testing jigs, in-circuit test (ICT) arrays, boundary scan tools, and specific functional fixtures to stress-test your boards. This comprehensive strategy eliminates defect escapes and guarantees 100% stable performance before final logistics clearance.
A look into our cleanrooms, high-precision assembly lines, and component tolerances.
STHL's automated surface mount technology lines utilize Yamaha and Panasonic placement heads, yielding top-tier placement accuracy for modern microelectronics. We successfully deploy complex processes for:
We run active inline 3D solder paste inspection (SPI), automated optical inspection (AOI), and X-Ray diagnostics to catch coplanarity anomalies, bridging issues, or internal voiding before thermal cycles occur.
For high-reliability connectors, power components, or heavy-duty electronics, Through-Hole assembly remains critical. STHL's dedicated DIP lines ensure physical joint strength:
How our smart infrastructure helps international partners reduce risk and optimize production costs.
STHL is located in Shenzhen, the global capital of electronics. We source components via a network of authorized manufacturers and distributors. Our systems track component lifecycles, flag obsolete parts early, and suggest drop-in replacements to prevent assembly stoppages.
Our Manufacturing Execution System (MES) records process data for every batch of PCBs. We scan components at intake and trace them through SMT placement, reflow, testing, and shipping. This helps customers in regulated industries trace quality issues back to specific material batches.
We scale production quickly using flexible line balancing. We run separate NPI (New Product Introduction) programs to resolve design issues before starting volume production. This ensures your project moves from prototype to production on schedule.
We know how critical design intellectual property is. STHL enforces strict access controls: all CAD files, Gerber data, and firmware binaries are stored on secure local servers. Access is restricted to authorized engineers, and we use secure programming systems to protect your firmware from exposure.
Custom turnkey PCB assembly strategies designed for certified, highly regulated industries.
We build vehicle control units (VCU), ADAS systems, radar systems, and charging controllers. We choose AEC-Q100/101 qualified parts, use AOI check methods, and run thermal aging tests to verify durability.
Our teams build PCBA for infusion pumps, health monitors, diagnostics tools, and imaging systems. We track all parts by batch, manage critical components carefully, and clean PCBs to IPC class 3 standards.
We build distributed power generation control systems, solar street light controllers, and drilling gear. Our boards use heavy copper, thick isolation gaps, and conformal coatings to resist outdoor elements.
We assemble smart locks, voice assistants, wireless headsets, and webcams. We support RF design, tune Bluetooth and Wi-Fi antennas, and build compact multi-layer PCBs with complex HDI features.
Managing international trade requirements, import compliance, and local logistics for a smooth supply chain.
We understand that ordering electronics from overseas requires more than just high-quality assembly. It requires navigating different customs rules, tax structures, and international standards. STHL helps simplify this process for our customers by handling localization support and logistics tracking.
We maintain dedicated English-speaking account managers and engineering support teams. They work closely with your design team to resolve questions, clarify engineering instructions, and manage product changes (ECOs) in real time.
Preparing for the next generation of high-frequency, high-density, and eco-friendly electronics.
As microchips shrink, we continue to upgrade our production lines. We are adding capacity to assemble 0.3mm and smaller pitch micro-BGAs, high-density HDI boards with stacked microvias, and rigid-flex designs for wearable tech.
To support global sustainability goals, we are expanding our use of halogen-free laminates, low-temperature lead-free solder pastes, and water-recycling cleaning systems to minimize our environmental footprint.
We are integrating machine learning software into our AOI and X-ray systems. AI helps flag minor anomalies like micro-cracks and voiding, improving inspection speed and reliability beyond manual checks.
Common questions about our turnkey PCB assembly services, manufacturing processes, and lead times.
Review our diverse manufacturing capabilities, supporting everything from IoT controllers to heavy industrial power boards.
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