Precision environmental sensing PCBA designed for long-term stability and accurate analog-to-digital signal conversion.
Acoustic signal processing hardware featuring low-noise amplifiers and high-resolution audio codecs.
High-frequency RF layout and assembly supporting multi-constellation GPS, GLONASS, and BeiDou tracking.
Consumer IoT audio solution integrating wireless connectivity, power management, and digital amplifiers.
Ultra-low power display driver board optimized for e-paper displays and extended battery life cycles.
Automotive-grade PCBA compliant with IATF 16949, featuring high-speed digital buses and thermal dissipation design.
High-reliability mission-critical assembly built to withstand extreme mechanical shock and thermal stress.
Secure access control hardware integrating biometric interfaces, relays, and encrypted communication protocols.
Shenzhen STHL is a premier provider of high-quality electronics manufacturing services (EMS) based in China. We serve a diverse global clientele across the entire electronics lifecycle, offering integrated solutions that span PCB layout, component sourcing, PCB fabrication, PCBA assembly, cable assembly, box build assembly, and comprehensive functional testing services.
Established in 2006, STHL brings nearly 20 years of specialized experience in electronics contract assembly manufacturing. Today, our team consists of over 220 highly skilled professionals. Our state-of-the-art 10,000 square meter facility features 7 automated SMT assembly lines, 2 DIP/THT lines, 2 functional testing lines, and 2 dedicated finished device assembly lines, enabling us to scale seamlessly from prototyping to high-volume production.
We deliver robust electronics assembly services across multiple demanding sectors, including energy power, telecommunications, automotive, medical, consumer electronics, computing & storage, security, and industrial automation. Our global footprint covers major markets including the USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, South Korea, Thailand, and over 90 other countries and regions.
Surface Mount Technology (SMT) is the cornerstone of modern electronics manufacturing, requiring extreme precision and adaptability. At STHL, we are equipped to handle a comprehensive range of advanced, high-density components, ensuring optimal electrical performance and mechanical reliability.
Our SMT capabilities include the precise placement of:
To guarantee zero-defect manufacturing, our SMT lines integrate advanced inspection technologies, including 3D Solder Paste Inspection (SPI), Automated Optical Inspection (AOI), and high-resolution X-Ray inspection to verify hidden solder joints under BGAs and QFNs.
While SMT dominates high-density designs, Through-Hole Technology (THT) remains indispensable for components subjected to mechanical stress, high power loads, or thermal cycling. STHL maintains a robust THT department to provide comprehensive hybrid assembly solutions.
Our THT services encompass:
Every THT and hybrid board undergoes rigorous post-soldering inspection and functional testing (FCT) to ensure long-term operational reliability in harsh environments.
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 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.
The electronics manufacturing landscape is undergoing a rapid transformation driven by the demand for smaller, faster, and more energy-efficient devices. As a leading Chinese PCBA manufacturer, STHL keeps pace with these technological shifts to provide future-proof manufacturing solutions.
The proliferation of IoT wearables and medical implants has pushed component sizes down to 01005 and even 008004 footprints. Handling these components requires ultra-precise placement systems, advanced solder paste chemistry, and sub-micron level optical inspection tools to prevent defects like tombstoning and bridging.
Modern processors and memory modules require Package-on-Package (PoP) configurations to minimize signal propagation delay. This demands highly controlled reflow profiling and advanced flux management to ensure reliable vertical interconnects between stacked active components.
Global environmental regulations (such as RoHS and REACH) mandate lead-free assembly. Lead-free alloys require higher reflow temperatures, narrowing the process window. STHL utilizes nitrogen-purged reflow ovens to prevent oxidation and optimize wetting during the lead-free soldering process.
In today's volatile market, global procurement managers face challenges ranging from component obsolescence to shipping bottlenecks. STHL addresses these pain points by offering a resilient, transparent, and highly integrated supply chain model.
With a dedicated global sourcing office, STHL maintains direct relationships with authorized distributors (such as Arrow, Avnet, DigiKey, and Mouser) alongside verified local manufacturers in China. Every batch of incoming components undergoes strict incoming quality control (IQC), including visual inspection, date code verification, and electrical testing to eliminate counterfeit risks.
We offer three flexible procurement engagement models: Turnkey (we source all parts), Consigned/Kitted (you supply all parts), and Hybrid (you supply critical ICs, we source passives and connectors). This flexibility allows procurement teams to optimize costs while maintaining control over proprietary silicon.
Different industries demand different levels of reliability, testing, and compliance. STHL tailors its surface mount assembly processes to meet the specific standards of diverse vertical markets.
Compliant with IATF 16949 standards. We focus on thermal cycling resistance, vibration-proof solder joints, and AOI/X-ray validation for advanced driver-assistance systems (ADAS) and EV charging controllers.
Standard: IPC-A-610 Class 3Certified under ISO 13485. We implement full component traceability, cleanroom-like handling, and rigorous functional testing for patient monitoring systems and diagnostic equipment.
Standard: ISO 13485 CompliantDesigned for harsh environments. We offer conformal coating services to protect PCBA assemblies from moisture, dust, chemical contaminants, and extreme temperatures.
Standard: IPC-A-610 Class 2Navigating cross-border manufacturing requires absolute trust, clear communication, and strict adherence to international standards. STHL bridges the gap between Chinese manufacturing efficiency and Western quality expectations.
Intellectual Property (IP) Protection: We understand that your design files are your most valuable assets. STHL signs comprehensive Non-Disclosure Agreements (NDAs) and utilizes secure, isolated local servers for client design data. Access to project files is restricted solely to assigned project engineers.
Regulatory Compliance: Our manufacturing processes are fully aligned with global environmental directives. We provide full documentation for RoHS (Restriction of Hazardous Substances) and REACH compliance, ensuring your products can be legally imported and sold in the EU, North America, and beyond.
To maintain our competitive edge as a premier electronics contract manufacturer, we continuously invest in equipment upgrades and process innovations. Here is our roadmap for the coming years.
Implementation of a comprehensive Manufacturing Execution System (MES) to provide real-time tracking of every PCB assembly through the production line, enhancing traceability and process control.
Upgrading our 3D AOI and X-Ray systems with deep-learning algorithms to reduce false call rates and improve defect detection accuracy on ultra-fine pitch components.
Expanding capabilities for assembly on flexible, rigid-flex, and ceramic substrates to support next-generation aerospace, medical, and high-frequency communication devices.
Find answers to common questions regarding our surface mount assembly processes, capabilities, and logistics.
High-power, thermally optimized PCBA designed for EV on-board chargers and power conversion modules.
Complex multi-layer control boards integrating motor drivers, image processing, and interface logic.
Industrial-grade sensor interface board with high chemical resistance and signal conditioning circuitry.
Safety-critical alarm PCBA featuring fail-safe circuitry, audible alerts, and wireless notification modules.
Multi-sensor integration board measuring PM2.5, CO2, TVOC, temperature, and humidity levels.
Compact IoT power switch board featuring integrated Wi-Fi/Bluetooth, relays, and energy metering ICs.
Communication hardware optimized for clear voice transmission, noise cancellation, and rugged casing fit.
Highly sensitive analog front-end PCBA designed for Geiger-Muller tube pulse detection and processing.
STHL PCBA