Explore our high-precision manufacturing capabilities across critical industrial, medical, and consumer sectors.
Shenzhen STHL is a premier, high-quality provider of electronics manufacturing services (EMS) based in China, serving global customers across the entire industry chain. Our integrated capabilities span PCB layout, component sourcing, PCB fabrication, PCBA assembly, cable assembly, box build assembly, and comprehensive testing services. Established in 2006, STHL brings 20 years of experience in electronics contract assembly manufacturing to the global stage.
Currently, STHL houses a dedicated team of over 220 staff members. Our state-of-the-art 10,000 square meter facility features 7 automated SMT assembly lines, 2 DIP/THT lines, 2 functional testing (FCT) lines, and 2 finished device assembly (box build) lines. We provide electronics assembly services for energy power, communications, automotive, medical, consumer electronics, computers & storage, safety & security, commercial, and industrial products.
As an IATF16949, ISO9001, ISO14001, and ISO13485 certified electronics assembly manufacturer, we produce products that strictly comply with RoHS standards. Our engineering and production capacities in materials analysis, advanced equipment, and reliability testing (AOI, X-RAY, ICT, and functional testing) make us a recognized, long-term reliable PCBA vendor for customers in the USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, Korea, Thailand, and 90 other regions worldwide.
From ultra-fine pitch SMT to heavy-duty THT, we deliver precision engineering for complex board designs.
We handle a wide range of advanced components, including Ball Grid Array (BGA) and Ultra-Fine BGA (uBGA). Our engineering team has the expertise to handle these complex components with precision, ensuring reliable connections and void-free soldering. We also support QFN, QFP, SOIC, and PLCC packages, utilizing advanced placement equipment to tackle various surface-mount package types efficiently.
For high-density designs, we support Package-on-Package (PoP) and small chip packages, handling intricate components with tight pitch spacing down to 01005. Our commitment to quality goes beyond component expertise; we utilize advanced inspection techniques, including 3D Solder Paste Inspection (SPI), Automated Optical Inspection (AOI), and 3D X-Ray inspection, to guarantee flawless assembly.
STHL PCBA excels in Through-Hole Technology (THT) assembly, offering manual and automatic component insertion. We leverage both manual dexterity for complex, odd-form components and automated insertion systems for high-quality, high-volume component placement. Custom THT assembly fixtures are designed in-house to ensure consistent alignment and efficient assembly.
We prioritize ESD (Electrostatic Discharge) protection and adhere strictly to RoHS compliance, guaranteeing the safety and environmental responsibility of our processes. Just like SMT assemblies, THT boards undergo rigorous inspection and functional testing before shipment, ensuring they withstand harsh operating environments.
End-to-end manufacturing services designed to accelerate your time-to-market and optimize production costs.
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 single-sided to complex multi-layers, and from flex PCB to rigid-flex PCB. We use premium materials and controlled processes to meet precise specifications.
We 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 assemblies for industrial applications.
Transitioning your projects from SMT assembly to box build assembly at STHL is cost-effective and fast. Covering everything from putting a PCBA into the enclosure with functional testing to complete product packaging, we supply 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 before shipment.
How our smart manufacturing ecosystem in Shenzhen drives cost-efficiency, agility, and risk mitigation.
At STHL, we have embraced the principles of Industry 4.0 by integrating advanced automation, real-time data tracking, and smart logistics into our manufacturing processes. Our facility in Shenzhen sits at the heart of the world's most robust electronics supply chain ecosystem. This location allows us to source raw materials, specialized substrates, and rare components faster than regional competitors, significantly shortening lead times for global clients.
Our smart factory utilizes a centralized Manufacturing Execution System (MES) that tracks every board from bare PCB loading to final box build packaging. This end-to-end traceability is crucial for high-reliability sectors like medical (ISO 13485) and automotive (IATF 16949). By monitoring machine performance, reflow temperature profiles, and AOI test yields in real-time, we can proactively adjust parameters to prevent defects before they occur.
"By combining China's supply chain density with smart automation, STHL delivers up to a 30% reduction in total cost of ownership (TCO) while maintaining defect rates below 50 PPM."
Furthermore, our component sourcing division maintains direct relationships with authorized global distributors and original component manufacturers. This mitigates the risk of counterfeit parts and protects our clients from supply chain disruptions and component allocations. When a component goes end-of-life (EOL) or experiences long lead times, our engineering team works to identify drop-in replacements or redesign the PCBA to keep production schedules on track.
Tailored manufacturing services designed to meet the strict regulatory and performance standards of diverse sectors.
We manufacture high-reliability controllers for solar street lights, wind power systems, and advanced Battery Management Systems (BMS). Our assemblies are engineered to withstand extreme temperatures, thermal cycling, and outdoor environmental stresses.
Certified under ISO 13485, we manufacture PCBA for blood pressure monitors, medical barcode scanners, and diagnostic equipment. We implement strict process controls, cleanroom assembly options, and complete device traceability.
From electric crane controllers to industrial waste gas online monitoring systems, we build robust electronics that operate reliably in high-vibration, high-EMI, and chemically harsh industrial environments.
We support the wireless revolution with high-precision assembly for portable Wi-Fi devices, biometric security systems, and smart consumer electronics, optimizing RF performance and antenna integration.
Staying ahead of the technology curve to support next-generation electronic designs.
As devices shrink, we are expanding our capabilities to support sub-0.3mm pitch BGAs, embedded components, and multi-layer HDI boards up to 32 layers. Our investment in next-generation SMT placement heads ensures placement accuracy of +/- 15 microns.
We are integrating artificial intelligence into our 3D AOI and 3D X-Ray systems. By training AI models on millions of solder joints, our systems can detect micro-voids, head-in-pillow defects, and component misalignment with higher accuracy, reducing false calls and escaping defects.
In line with global environmental initiatives, STHL is transitioning to low-temperature lead-free soldering alloys, reducing energy consumption during the reflow process. We are also optimizing our waste management systems to achieve zero-landfill status for our manufacturing byproducts.
Bridging the gap between offshore manufacturing efficiency and local engineering support.
Working with an offshore EMS partner can raise questions about communication, quality control, and regulatory compliance. At STHL, we address these concerns through a structured customer service model. Our project managers and engineering teams speak fluent English and operate on overlapping time zones to provide real-time updates to our clients in North America, Europe, and Asia-Pacific.
We ensure compliance with international standards, including RoHS, REACH, and WEEE. Our quality management systems are audited annually by third-party registrars to maintain our IATF 16949 (Automotive Quality Management) and ISO 13485 (Medical Devices Quality Management) certifications. This ensures that every board we assemble meets the legal and safety requirements of your target market.
For logistics, we offer flexible shipping terms (FOB, CIF, DDP) and partner with global freight forwarders to handle customs clearance, duty payments, and door-to-door delivery. Whether you require prototype batches shipped via express air courier or high-volume production container shipments by sea, we manage the entire logistics chain to ensure your products arrive safely and on schedule.
Optimizing material costs and securing supply chains through strategic vendor management.
Electronic components represent the largest portion of a product's bill of materials (BOM) cost. STHL's strategic procurement team leverages our purchasing power and deep supplier network to secure competitive pricing for our clients. We source components globally, utilizing verified distributors in Asia, Europe, and the United States to find the best balance of cost and lead time.
We offer three sourcing models to fit your operational preferences:
Our incoming quality control (IQC) laboratory inspects all incoming materials. We use component testing, solderability testing, and X-ray analysis to verify the authenticity and quality of every batch before it reaches the production floor.
Get answers to common questions about our capabilities, lead times, quality standards, and ordering processes.
To provide an accurate and timely quotation, we require Gerber files (RS-274X format) for the PCB fabrication, a Bill of Materials (BOM) in Excel format containing manufacturer part numbers, descriptions, and quantities, and a Pick-and-Place (Centroid) file for SMT component coordinates.
We implement a multi-stage quality control process, including Solder Paste Inspection (SPI), Automated Optical Inspection (AOI) for SMT lines, 3D X-Ray inspection for BGA/QFN packages, first article inspection (FAI), and comprehensive functional testing (FCT) based on client-provided test protocols.
Yes, STHL is certified under ISO 13485 for medical device manufacturing and IATF 16949 for automotive electronics. We also hold ISO 9001 for quality management and ISO 14001 for environmental management, ensuring adherence to strict industry standards.
For prototype runs using quick-turn components, we can complete assembly in 3 to 5 working days after all materials are received. For mass production, typical lead times range from 4 to 6 weeks, depending on component availability and order complexity.
Yes, we support low-volume prototyping as well as high-volume mass production. We have dedicated SMT lines optimized for quick setups and small runs, allowing you to test and refine your designs before scaling up.
Yes, we provide complete box build assembly services. This includes installing the assembled PCBA into plastic or metal enclosures, routing internal cables, installing connectors, performing final functional testing, and packaging the finished product for retail or distribution.
High-performance circuit board assemblies engineered for reliability in demanding applications.
STHL PCBA
