Shenzhen STHL is a premier global provider of Electronics Manufacturing Services (EMS) based in China. We serve customers worldwide along the complete electronics industrial chain, offering specialized end-to-end solutions. Our services cover professional PCB layout, high-integrity component sourcing, rigid and flexible PCB fabrication, state-of-the-art SMT and THT assembly, customized cable assembly, complete box build assembly, and comprehensive functional verification testing.
Established in 2006, STHL has built nearly 20 years of technical expertise in electronics contract assembly manufacturing. Today, our organization is supported by over 220 skilled professionals. Our modern, 10,000 square meter factory is fully optimized to execute high-volume manufacturing campaigns as well as complex, high-mix prototypes. Our equipment footprint includes:
To ensure absolute reliability in volatile, high-stress environments, STHL maintains strict adherence to international quality management systems. We are fully certified to IATF 16949 for automotive electronics, ISO 13485 for medical devices, ISO 9001 for general quality systems, and ISO 14001 for environmental management.
Every product manufactured within our facilities is built to RoHS compliance regulations and undergoes stringent quality assurance procedures. Leveraging our deep engineering capabilities, we conduct material analysis and storage under humidity-controlled parameters. Reliability is guaranteed via our automated inline testing processes, including 3D Automated Optical Inspection (AOI), high-definition X-Ray inspection for BGAs, In-Circuit Testing (ICT), and customer-tailored Functional Testing (FCT). Our customer footprint extends across the USA, Germany, Italy, UK, Poland, New Zealand, Argentina, Brazil, Turkey, Korea, Thailand, and over 90 other regions.
Building reliable circuits requires a deep engineering foundation. STHL utilizes state-of-the-art pick-and-place lines, lead-free reflow ovens, and wave-soldering machines to process complex form factors, including standard rigid FR4 substrates, flexible polyimide, and aluminum metal-core boards.
We handle a wide range of advanced components including Ball Grid Array (BGA), ultra-fine pitch uBGA, QFN, QFP, SOIC, and PLCC packages. Our machines place components down to 01005 package sizes with micro-millimeter alignment accuracy.
Expertise in Package-on-Package (PoP), blind/buried vias, and small-chip packages with tight pitch spacing. We design and employ custom fixture carriers to stabilize thin, flexible PCB panels during the screen-printing and reflow cycles.
Our Through-Hole Technology (THT) lines combine automated component insertion with experienced manual assembly for high-power connectors, relays, and heavy-duty capacitors. Dual-wave soldering processes are monitored using thermal profiling.
Whole-process electrostatic discharge (ESD) protection and strict lead-free, RoHS-compliant assembly. All manufacturing operations are conducted within temperature- and humidity-controlled cleanrooms to protect sensitive semiconductors.
Our quality control protocols leave no room for manufacturing variations. For fine-pitch BGAs and hidden leaded components (such as QFNs), we utilize 3D Automated Optical Inspection (AOI) to verify component orientation, alignment, and solder fillets.
Furthermore, our offline and inline transmission X-Ray inspection systems analyze the internal solder integrity beneath array packages. This allows our QC engineers to identify voiding, solder bridging, and micro-cracks that are completely invisible to the naked eye.
As devices shrink, the demand for flexible circuits (FPCs) increases. Traditional FR4 boards are rigid and bulky. Flex PCBs, constructed from high-durability polyimide (PI) films, allow circuits to bend, fold, and twist. This enables dense packing inside complex housings like foldables, medical implants, and high-vibration automotive systems.
High-frequency, high-speed applications are transitioning from standard Polyimide to Liquid Crystal Polymer (LCP) and Modified Polyimide (MPI). These advanced materials offer low dielectric constants (Dk) and dissipation factors (Df), reducing insertion losses. They are essential for 5G antenna arrays, high-speed datalinks, and satellite communication components.
By combining thin adhesive-free copper-clad laminates (FCCL) with high-density laser drilling, we fabricate multi-layer FPCs up to 8 layers with blind and buried micro-vias. Our rigid-flex designs integrate rigid PCB sections with flexible circuit ribbons. This eliminates standard board-to-board connectors, reducing weight, increasing reliability, and lowering assembly times.
To support fine-pitch chip-scale packages (CSP) and high-pin-count micro-controllers, our factory utilizes semi-additive processing (SAP) and advanced photolithography. We manufacture flex circuits with line width and spacing (L/S) down to 30/30 micrometers. This helps minimize signal noise and crosstalk in high-speed, high-density designs.
| Feature Parameter | Standard Flex Capability | Advanced Flex Capability (STHL Roadmap) |
|---|---|---|
| Layer Count | 1 to 4 Layers | Up to 10 Layers (Rigid-Flex up to 20 Layers) |
| Min Line Width / Spacing | 75 μm / 75 μm | 35 μm / 35 μm (Laser Direct Imaging) |
| Minimum Drill Hole (Laser) | 100 μm | 50 μm (Micro-vias, filled with copper) |
| Base Substrates Available | Standard Polyimide (PI) | Liquid Crystal Polymer (LCP), Modified PI (MPI), PET |
| Surface Finish Options | ENIG, OSP | ENEPIG, Hard Gold, Soft Bondable Gold |
Flexible printed circuits are vital for modern electronics. We manufacture FPC and Rigid-Flex systems for highly regulated industries worldwide.
Modern Electric Vehicles use high-durability flex ribbons to monitor cell voltage and temperature in lithium battery packs. Our BMS flex assemblies replace bulky wire harnesses. This reduces weight and simplifies robotic pack assembly while resisting thermal changes.
From smart infusion pumps to high-definition digital X-ray machines and wearable biosensors, our medical PCBs provide signal integrity for diagnostic tools. Our manufacturing processes follow strict ISO 13485 regulations, including batch traceability and raw material tracking.
High-density security lighting, smart access locks, and localized video recording systems utilize our complex SMT assemblies. Our products are engineered to withstand environmental extremes, moisture, dust ingress, and constant mechanical actuation.
IIoT deployments require small-form-factor sensor nodes for machine monitoring. Our ultra-thin flex PCBs fit into tight spaces inside industrial motor housings and robotic joints, providing real-time vibration and temperature data.
In modern electronics manufacturing, supply chain resilience is as critical as design execution. Located in Shenzhen, the heart of global electronics manufacturing, STHL leverages a mature localized ecosystem. We access high-grade raw laminates, active integrated circuits, passive components, and specialized tooling within hours. This strategic position helps minimize turnaround times and protects operations against global logistics shocks.
Our "Smart Factory" utilizes ERP and MES software to monitor production from component arrival to final assembly. Material reels are tracked via QR codes, and our dry cabinets prevent moisture damage to sensitive components. By integrating automated optical sorting, inline solder paste inspection (SPI), and automated placement heads, we maintain high yields and reduce scrap rates.
This digital traceability also streamlines auditing for highly regulated industries. Medical, automotive, and industrial clients receive complete component origin tracking, RoHS compliance verification, and performance logs for every manufacturing run.
STHL provides complete electronics manufacturing services (EMS), managing the production process from component sourcing through final functional validation and packaging.
We manufacture double-sided, multi-layer rigid boards, single-layer and multi-layer flex circuits, and complex rigid-flex designs. We offer diverse surface finishes, including HASL Lead-free, ENIG, OSP, and immersion silver, to match your electrical performance requirements.
Our global sourcing network accesses authorized distributors and direct component manufacturers. This helps us secure genuine parts, manage lead times during shortages, and source hard-to-find components to keep your production on schedule.
We provide full mechanical box-build services, assembling PCBs into custom plastic, die-cast, or sheet-metal enclosures. This includes installing connectors, user interfaces, gaskets, and internal cabling to deliver complete, retail-ready systems.
We manufacture custom cable assemblies and complex wiring harnesses, using automated termination machinery and specialized testing fixtures to ensure strong, reliable electrical connections under mechanical stress.
To ensure out-of-the-box reliability, our engineers design custom Functional Test (FCT) setups. These systems simulate operating conditions, verifying communication protocols, signal responses, and power draws to prevent field failures.
Navigating international supply chains requires local support and strict regulatory compliance. STHL provides direct communication with our bilingual engineering teams. We offer Design-for-Manufacturing (DFM) reviews to resolve board layout, stack-up, and component issues before tooling begins.
We handle complex import/export documentation, customs brokerage, and logistics coordination. Whether you require EXW, FOB, or DDP delivery, we coordinate with reliable air express carriers and maritime freight companies to ensure safe, on-time arrivals at your assembly plants or warehouses.
Explore answers to common questions about flexible PCB manufacturing capabilities, design guidelines, quality standards, and assembly lead times.
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