Explore our engineering capability matrix across medical, renewable energy, automotive, and high-reliability industrial control systems.
The global electronics sector is undergoing a rapid transition toward high-mix, low-volume flexibility alongside uncompromising quality standards. Under this model, China EMS (Electronic Manufacturing Services) has evolved from basic PCB stuffing to highly collaborative engineering, comprehensive testing, and lifecycle supply chain governance.
A trusted EMS partner since 2006, delivering high-integrity PCBA and box build assemblies to over 90 regions globally.
Year Established
Production Facility
Skilled Staff
SMT / DIP Lines
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. 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 from USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, Korea, Thailand, and the other 90 regions of the world.
As an IATF16949, ISO9001, ISO14001,and ISO13485 certificated electronics assembly manufacturer, we produce products exactly comply with RoHS standard and quality guarantee. 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), high effective SMT and THT assembly, we are recognized as a long-term reliable PCBA vendor by more and more customers worldwide. Welcome to visit STHL factory at any time.
Surface Mount Technology (SMT) demands strict thermal profiling and micro-placement accuracy. Our advanced SMT lines ensure that complex high-density components are placed and soldered with extreme accuracy.
For high-stress, mechanical load, and high-power connections, Through-Hole Technology remains a structural necessity. Our dual THT assembly line capability provides high joint strength and high-quality electrical connection paths.
STHL PCBA also excels in Through-Hole Technology (THT) assembly. Our services encompass:
Providing structural support across the entire product development cycle from prototype to scale.
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-flex PCB, 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.
Addressing supply chain volatility, component verification, and cross-border regulatory compliance for enterprise buyers.
Counterfeit components represent a significant financial and reputational hazard for high-reliability industries. STHL mitigates this by utilising OCM (Original Component Manufacturer) and authorised franchise dealers (such as Arrow, Avnet, Mouser, Digi-Key). Our in-house QC laboratory performs incoming component verification including microscopic examinations, acetone testing, and X-ray die analysis.
For industrial control systems, smart grids, and medical monitors with extended lifecycles (10+ years), we offer dedicated End-of-Life (EOL) monitoring. Our team identifies pin-compatible alternates and plans proactive design refreshes before critical chips are retired by manufacturers, preventing unplanned manufacturing halts.
Prior to launching assembly tooling, our production engineers perform DFM reviews. We check trace clearances, copper weights, thermal relief designs, solder mask structures, and component spacing. Resolving these layout design conflicts early reduces structural assembly defects and increases high-volume yields.
Adapting manufacturing parameters for next-generation smart electronics, IoT connectivity, and ultra-miniaturized components.
As medical implants, wearable technology, and industrial sensor probes demand tighter form factors, passive package designs are moving from 0201 to 01005 standards. SMT nozzle configuration, camera resolution, solder paste consistency, and stencil aperture ratios must be precisely calibrated to prevent defects such as tombstoning, skewing, and voiding.
High-speed computing boards and modern telecommunication structures use multi-layer microvia architecture (often exceeding 12 layers with blind and buried vias). STHL’s PCB fabrication processes support stacked microvias and laser drilling technologies to optimize trace lengths, control impedance, and reduce signal loss.
With the growth of Electric Vehicle (EV) chargers, wind power controllers, and industrial power supplies, heat dissipation is a primary failure vector. We employ heavy copper circuit boards (ranging from 3oz up to 10oz), insulated metal substrates (IMS), and direct thermal vias to conduct heat away from MOSFETs and switching regulators.
Lead-free assembly is only the baseline. International markets now require halogen-free laminates, biodegradable packaging materials, and energy-efficient manufacturing processes. STHL maintains full RoHS compliance, REACH declarations, and ISO 14001 certification to assist our customers in achieving environmental benchmarks.
Find answers to critical inquiries about quality control, production capability, lead times, and global supply logistics.
Explore our engineering capabilities across aerospace, industrial climate sensors, home appliance control systems, and high-definition video processing platforms.
STHL PCBA