Explore our high-performance electronic assemblies manufactured to IATF16949 and ISO13485 industry certifications.
Shenzhen STHL is a leading, high-quality provider of Electronics Manufacturing Services (EMS) in China. We support global innovators across the entire hardware lifecycle: from initial DFM design and PCB layout, component procurement, raw PCB fabrication, and high-precision SMT/THT assembly, to complex box build assembly and comprehensive environmental/functional testing.
Established in 2006, STHL has built over 20 years of technical expertise in electronics contract assembly manufacturing. Our modern, ESD-controlled 10,000 sqm production facility operates with over 220 skilled workers and staff, housing 7 SMT assembly lines, 2 DIP/THT lines, 2 specialized functional testing (FCT) lines, and 2 final system integration lines.
We serve mission-critical markets including green energy power systems, industrial communications, automotive electronics (ADAS & body controllers), medical diagnostics, high-end consumer hardware, computing infrastructure, and smart IoT security networks. Our products are exported to OEMs and tech pioneers in the USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, Korea, Thailand, and over 90 other countries and regions.
Our manufacturing processes are engineered to process high-mix, variable-density circuits with sub-millimeter component placement accuracy.
Our surface mount lines are configured with high-speed Yamaha and Samsung pick-and-place systems capable of mounting high-density, complex IC packages with exceptional reliability:
For applications requiring heavy duty structural joints, high current flow, or robust physical connections, STHL maintains professional manual and wave-soldering processes:
From raw design to packaged goods ready for final delivery, we provide one-stop, turnkey manufacturing support.
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-flexPCB, we use premium materials and controlled processes to meet precise specifications.
STHL offer 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 assembly for many customers from various industrial applications.
Making your projects at STHL from SMT assembly to box build assembly is very 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 to your customers, we can supply the 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 and fully qualified.
Staying ahead of electronics miniaturization and speed requires constant equipment and engineering upgrades. STHL is focused on executing key advancements in physical manufacturing.
To support high-frequency communications, IoT wearables, and medical computing devices, STHL is expanding its micro-BGA capability down to 0.25mm pitch. We integrate advanced routing analysis (DFM) to optimize solder stencil designs, ensuring voids are minimized down to <5% via vacuum reflow processes.
The convergence of SMT, silicon packaging, and multi-chip integration is the next frontier. We are adopting hybrid assembly protocols that place components directly within the internal layers of multi-layer PCBs (Rigid-Flex/HDI), allowing dramatic volume reductions for portable medical and aerospace applications.
Our assembly lines leverage neural network software for optical inspection. By feeding thousands of defect patterns into our inspection systems, we can instantly trace assembly anomalies to the exact squeegee angle or pick-and-place head, realizing an optical escape rate close to zero.
As EU environmental compliance rules tighten, STHL is pioneering clean-energy solder processes. By utilizing low-temperature solder alloys (LTS) such as SnBiAg compounds, we reduce peak reflow oven temperatures from 250°C to 180°C, lowering carbon footprint and minimizing board thermal warping stress.
Industrial hardware requirements vary drastically across fields. We build tailored manufacturing processes designed for your specific vertical.
From wind power controllers to smart solar inverters, we build thick-copper PCBs and heavy THT joints capable of enduring continuous thermal cycles and high currents.
Strict traceability down to the wafer lot level. We handle advanced automotive sensors, ADAS modules, and EV charging control units requiring high vibration resistance.
Providing cleanroom-standard assembly for complex glucose monitors and ECG systems, ensuring zero solder splatters and clean, bio-compatible materials.
STHL leverages Shenzhen’s complete electronics supply chain to offer unmatched speed-to-market. By utilizing an automated ERP and MES database, we integrate real-time component availability updates with our automated SMT lines. This allows us to source raw boards and hard-to-find components inside of days rather than weeks.
Furthermore, our engineering teams perform thorough Design for Manufacturability (DFM) audits prior to production, preventing costly placement and layout errors. Through our lean manufacturing lines and optimized production cycles, we deliver cost advantages of 20% to 35% compared to Western contract manufacturers without sacrificing IPC assembly quality.
Our facility operates under continuous quality monitoring. Standard operating procedures (SOPs) are fully digitized, ensuring that changes to layout or design are pushed instantly to all assembly lines, maintaining total quality alignment.
We guarantee seamless regulatory alignment, secure logistics, and IP safety protocols for global supply chain integration.
STHL processes comply strictly with international directives. We run lead-free assembly processes in full conformance with RoHS and REACH. All components sourced are certified for origin, and we support UL 94V-0 flammability ratings and CE/FCC compliance testing preparation.
Intellectual property protection is a core business value. STHL enforces strict NDAs and maintains air-gapped engineering databases. Customer schematics and Gerber data are restricted to dedicated project engineers and are never shared or repurposed.
Evaluating OEM contract manufacturers involves analyzing technical capabilities, material sourcing networks, quality assurance steps, and engineering support. At STHL, we make this simple:
Our facility ensures reliability through five critical stages:
Common questions regarding our advanced PCB assembly capabilities, lead times, and quality assurance processes.
We support OEMs across diverse sectors with high-reliability circuit board manufacturing.
STHL PCBA
