High-fidelity prototype and production assemblies built to strict IPC Class II & III standards for critical global industries.
Shenzhen STHL is a high-quality provider of electronics manufacturing services (EMS) in China, serving 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, STHL has built 20 years of experience in electronics contract assembly manufacturing. Today, our 10,000 sqm facilities house a workforce of over 220 professionals, managing 7 SMT assembly lines, 2 DIP/THT lines, 2 function testing lines, and 2 finished device assembly lines.
We deliver assembly services tailored for energy power, communications, automotive, medical, consumer electronics, computers & storage, safety & security, commercial, and industrial markets. Our customer network spans the USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, Korea, Thailand, and 90 other regions globally.
As an IATF16949, ISO9001, ISO14001, and ISO13485 certified partner, we verify compliance with RoHS standards on every batch. With detailed material analysis, storage controls, and advanced testing (AOI, X-RAY, ICT, and FCT), STHL is recognized globally as a premium PCBA manufacturing vendor.
High-speed operations and rigorous engineering capabilities supporting global hardware prototyping.
Surface Mount Technology (SMT) forms the core of modern, high-density hardware. Our manufacturing lines handle the most complex package sizes and dense components to ensure structural and electrical integrity.
For heavy-duty power supplies, high-vibration automotive sensors, and industrial connections, Through-Hole Technology (THT) offers the mechanical strength SMT cannot replicate. We combine automation and manual precision to deliver high-quality, durable physical joints.
Why global tech companies route their engineering prototypes and short-run production through Shenzhen.
Shenzhen's component markets provide rapid access to passives, specialized microcontrollers, and raw materials, reducing procurement lead times from weeks to days.
Our engineers perform detailed Design for Manufacturability (DFM) audits prior to production, catching design issues early and avoiding costly rework.
With quick-turn tooling and automated lines, prototypes can be built, inspected, and shipped internationally within 24 to 72 hours of file sign-off.
Easily transition from 5-piece prototypes to high-volume production using the same lines, minimizing re-validation and qualification cycles.
We meet global quality and environmental mandates to ensure your hardware is ready for target markets.
Certifications including ISO 9001 for quality control, IATF 16949 for automotive assemblies, and ISO 13485 for medical systems.
We work in strict compliance with RoHS and REACH standards. All solder alloys, fluxes, components, and board coatings are verified lead-free.
We protect design layouts, firmware, and BOM details via secure, non-disclosure-backed infrastructure and isolated, auditable file systems.
Express air cargo routes (DHL, FedEx, UPS) deliver boards directly to your design lab within 3–4 working days from China.
From raw PCB fabrication to final box build assemblies, STHL manages the entire product realization workflow.
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 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.
Enterprise sourcing requires more than low unit costs. Hardware engineers and procurement leads look for manufacturing partners with clear quality systems, reliable scheduling, and professional communication.
STHL bridges this gap by combining Chinese manufacturing capacity with western engineering standards. Our staff addresses design questions directly, avoiding common production errors before assembly begins.
Our prototype SMT assembly capabilities are used in many specialized environments, including:
Industrial-grade modems, smart meters, solar panel controls, and automated grid-switching systems.
Continuous body temperature monitors, biological test arrays, and video monitoring systems built for clinical environments.
Millimeter-wave radar modules, sensor fusion hubs, and battery management boards for electric vehicles.
Answers to common questions about component sourcing, fabrication standards, and manufacturing workflows in China.
Typically, prototype runs are completed within 3 to 7 working days once we confirm the PCB layout and receive all components. For expedited projects, we offer a 24-to-48-hour turn service for quick-turn PCBs and simple component layouts.
We purchase components directly from authorized distributors (like Arrow, Avnet, DigiKey, and Mouser) or trusted, qualified local component channels. For high-risk parts, we use microscopic, electrical, and X-ray analysis to verify authenticity and avoid counterfeit materials.
Yes. We support fully consigned (you supply all components), partially consigned (you supply key ICs and we source the remainder), and turnkey options (we source all materials based on your Bill of Materials).
To quote your SMT assembly, we require Gerber files (in RS-274X or ODB++ format), an detailed Bill of Materials (BOM) in Excel format (including manufacturer part numbers, designators, packages, and quantities), and a Pick-and-Place (Centroid) coordinates file.
Yes, every PCB assembly goes through Automated Optical Inspection (AOI) to verify component presence, orientation, and solder joint quality. We also offer 3D X-Ray inspection for BGA/QFN packages, In-Circuit Testing (ICT), and full functional testing (FCT) based on customer-provided test plans.
We sign Non-Disclosure Agreements (NDAs) before design files are shared. All design files are stored on secure local servers with restricted access, and our facilities are monitored to restrict physical access to raw designs.
We have no MOQ for prototype assemblies. We can assemble a single board for initial validation, allowing you to test layouts before scaling up to mass production.
Yes, our processes are set up for lead-free wave soldering, reflow soldering, and hand soldering. We verify that all components, PCBs, and solders comply with RoHS and REACH regulations.
Explore our diverse industrial manufacturing and design implementation capabilities.
STHL PCBA