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.
It was 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) is the backbone of modern electronics. At STHL, we leverage state-of-the-art pick-and-place machinery and reflow ovens to handle the most complex component geometries. We can handle a wide range of advanced components, including:
But our commitment to quality goes beyond component expertise. We utilize advanced inspection techniques, including 3D Solder Paste Inspection (SPI), Automated Optical Inspection (AOI), and X-Ray inspection, to guarantee flawless assembly and structural integrity of hidden solder joints.
While SMT dominates high-density designs, Through-Hole Technology (THT) remains indispensable for components subjected to mechanical stress, high power, or thermal loads. STHL PCBA also excels in Through-Hole Technology (THT) assembly. Our services encompass:
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 offers 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.
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.
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, fully qualified, and ready for immediate field deployment.
Modern electronics must be engineered to withstand diverse environmental, electrical, and regulatory conditions. As a premier OEM surface mount assembly manufacturer, STHL customizes its manufacturing processes to meet the localized demands of various global industries:
Medical devices like pulse oximeters, telemedicine equipment, and medical information terminals require absolute reliability. Under ISO 13485 guidelines, STHL employs rigorous trace-ability protocols, lead-free biocompatible soldering, and extensive functional testing to ensure patient safety and regulatory compliance with FDA and CE standards.
Automotive electronics demand zero-defect manufacturing due to harsh operating environments. Our IATF 16949 certified facility produces high-durability PCBAs for Battery Management Systems (BMS), Air Data Inertial Reference Units (ADIRU), and Cockpit Voice Recorders (CVR). We focus on thermal cycling resistance, vibration mitigation, and conformal coating to protect against moisture and dust.
From smart meters to drilling equipment and elevator control systems, industrial PCBAs must operate continuously under extreme electrical noise and temperature swings. STHL designs heavy-copper PCBs, utilizes robust THT soldering for high-power components, and conducts ICT (In-Circuit Testing) to ensure long-term stability in the field.
Smartwatches, environmental monitoring stations, wireless headsets, and smart modems require extreme miniaturization and power efficiency. STHL utilizes advanced SMT lines capable of placing 01005 micro-components and fine-pitch BGAs, enabling high-density integration without sacrificing RF performance or battery life.
Manufacturing in Shenzhen, the world's leading electronics hub, provides STHL with unparalleled advantages in speed, cost, and agility. We have built a resilient ecosystem designed to buffer global disruptions and accelerate time-to-market:
With direct access to the world's largest component distribution network in Shenzhen, we source genuine parts within days rather than weeks. Our supply chain team performs real-time BOM (Bill of Materials) scrubbing, identifying end-of-life (EOL) or long-lead-time components early and suggesting drop-in replacements to keep production lines running.
Our 7 SMT lines are configured for rapid changeovers, allowing us to seamlessly transition from NPI (New Product Introduction) prototypes to high-volume mass production. This flexibility reduces engineering bottlenecks and ensures that design iterations are validated, manufactured, and shipped with minimal latency.
As electronic components continue to shrink and demand for high-frequency, high-power applications grows, STHL is continuously investing in next-generation manufacturing technologies. Our roadmap aligns with the future of global hardware innovation:
We are transitioning our SMT lines into fully connected smart systems. Real-time data collection from pick-and-place machines and reflow ovens allows for predictive maintenance, automatic yield optimization, and complete digital trace-ability for high-reliability sectors like aerospace and medical.
To support the next wave of IoT and wearable devices, our engineering team is refining processes for Package-on-Package (PoP) stacking, embedded passives, and ultra-fine pitch BGA alignment. We are prepared for the mass adoption of 008004 components.
Environmental stewardship is central to our operations. We are expanding our lead-free, halogen-free, and RoHS-compliant processes, optimizing energy consumption in our reflow ovens, and implementing circular waste management systems to minimize our carbon footprint.
Navigating international trade, technical standards, and quality certifications can be complex. STHL bridges the gap by providing robust localized communication alongside strict adherence to global engineering and safety standards:
We build all assemblies to IPC-A-610 Class II and Class III standards, ensuring that structural solder joints, component alignment, and cleanliness meet the highest industry benchmarks.
Our products are fully compliant with RoHS, REACH, and WEEE directives. We assist our clients in obtaining UL, CE, FCC, and VDE certifications for their finished box-build products.
We enforce strict intellectual property protection protocols, including secure server data storage, restricted access to engineering files, and comprehensive NDAs for all staff.
Find answers to common questions about our OEM surface mount assembly services, capabilities, and supply chain management.
STHL is fully certified under IATF 16949 (Automotive Quality Management), ISO 13485 (Medical Devices Quality Management), ISO 9001 (General Quality Management Systems), and ISO 14001 (Environmental Management Systems). All our manufacturing processes are compliant with the RoHS directive.
Yes. With 7 automated SMT lines and dedicated DIP/THT lines, we can efficiently process low-volume prototypes for NPI (New Product Introduction) as well as scale up to high-volume, multi-million unit mass production runs.
We source components directly from original manufacturers or authorized global distributors (such as Arrow, Avnet, DigiKey, and Mouser). For customer-consigned parts or specialized sourcing, we perform incoming inspections, including visual checks, date code verification, and X-ray analysis if required.
We employ a multi-stage testing protocol including 3D Solder Paste Inspection (SPI), Automated Optical Inspection (AOI) post-reflow, X-Ray inspection for BGA/QFN packages, In-Circuit Testing (ICT), and customized Functional Testing (FCT) to simulate real-world operating conditions.
Yes, STHL provides complete turnkey solutions. We handle everything from PCB fabrication and SMT/THT assembly to enclosure sourcing, final box-build integration, cabling, firmware flashing, functional testing, and custom packaging for direct shipment to your end customers.
STHL PCBA
