High-integrity Printed Circuit Board Assemblies designed and built to stringent international standards.
In modern industrial design, the connection between high-frequency printed circuit boards (PCBs) and internal system units requires robust, high-integrity wiring harnesses. High-performance electronics demand seamless communication between the main motherboard, power modules, and sensors. Choosing an integrated EMS provider who understands both PCB layout precision and wire harness mechanics is critical to avoiding signal degradation, electromigration, and premature thermal failures.
STHL stands at the forefront of this convergence. By offering end-to-end capabilities, we eliminate the operational gap between discrete board manufacturing and mechanical assembly cabling. This unified control ensures that connector clearances, impedance-matched wiring pathways, and physical structural integrity are fully validated long before global shipment, preventing field failures and high return rates.
Your long-term reliable manufacturing partner in Shenzhen, China with two decades of engineering excellence.
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.
Precision placement, advanced packages, and robust mechanical structures for harsh environments.
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 AOI and high-definition X-Ray inspection, to guarantee flawless solder joints and complete assembly optimization.
STHL PCBA also excels in Through-Hole Technology (THT) assembly. Our robust mechanical services encompass:
How automation and localized materials sourcing protect your production lines from market volatility.
STHL mitigates counterfeiting risks through strict component traceablity, direct relationships with original manufacturers, and authorized catalog distributors (Arrow, Avnet, DigiKey). LCR testing and incoming X-Ray inspection are standard procedures.
Leveraging high-end crimping equipment from Komax and Schleuniger, STHL guarantees consistent crimp heights and pull-force verification in compliance with IPC-A-620. This prevents high-resistance points and connection failures.
With 7 SMT lines and 2 finished device assembly lines, our manufacturing floor switches fluidly from high-mix, low-volume (HMLV) prototyping to high-volume multi-thousand batch runs. This ensures on-time deliveries even under tight deadlines.
Comprehensive turnkey engineering, manufacturing, and validation under one roof.
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 assembly 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 before leaving our factory floor.
Custom electronics and interconnect designs optimized for mission-critical operations.
Complying with IATF16949 standards, we assemble high-reliability Transmission Control Units (TCUs) and robust sub-harnesses capable of surviving extreme vibrations, engine heat, and fluid ingress.
Manufacturing ISO13485-certified board assemblies for Magnetometers and Water Quality Analyzers. Every wire path is shielded to ensure zero EMC interference during micro-volt medical measurements.
For systems like Air Data Computers, STHL delivers specialized soldering, polyimide rigid-flex PCBs, and high-density circular wire connectors certified to withstand high altitudes and thermal shock.
Turnkey fabrication of wireless headsets, smart intercom systems, and home automation controllers. Fast prototyping, plastic housing overmolding, and full box-build packaging.
The electronics integration landscape is evolving toward denser circuits, faster signal transition rates, and challenging thermal dissipation constraints. STHL's engineering roadmap incorporates research into the following cutting-edge areas:
STHL maintains operational excellence through continuous audit loops and international standards compliance. Our certifications include:
Bridging geographical gaps with dedicated engineering support and seamless logistics.
Our native English-speaking engineering team conducts thorough Design for Manufacturing (DFM) and Design for Testing (DFT) reviews on gerbers and wire routing diagrams, identifying layout errors prior to manufacturing.
We work with global trade compliance experts to catalog harmonized codes (HS codes) properly. STHL offers flexible shipping structures (FOB, CIF, DDP) to minimize tariff expenses for North American and European partners.
Complete traceability is maintained using our ERP system. Changes to wire dimensions, connector BOMs, or PCB layouts are captured in formal Engineering Change Orders (ECO), protecting your intellectual property.
Clear, direct answers regarding engineering capabilities, ordering logistics, and quality assurance.
High-specification PCBs and components assembled for specialized industrial applications.
STHL PCBA
