Explore our high-precision assemblies engineered to meet rigorous international standards for aerospace, medical, automotive, and industrial applications.
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.
From rapid prototyping to high-volume production, we offer integrated EMS solutions tailored to your exact specifications.
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 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.
A detailed look into our advanced engineering capabilities, component handling, and quality assurance protocols.
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 X-Ray inspection, to guarantee flawless assembly.
STHL PCBA also excels in Through-Hole Technology (THT) assembly. Our services encompass:
Adapting to the next generation of electrical harness assembly and PCBA technologies to keep our clients ahead of the curve.
As the automotive sector transitions rapidly to electric vehicles (EVs), the demand for high-voltage (up to 1000V) and high-current wire harnesses has surged. STHL is actively expanding its engineering capabilities to support heavy-duty shielding, advanced orange insulation materials, and specialized ultrasonic welding techniques that ensure minimal contact resistance and maximum thermal dissipation.
With the rise of 5G, IoT, and high-speed data transmission, maintaining signal integrity while preventing Electromagnetic Interference (EMI) is critical. We integrate advanced shielding techniques, including braided copper sleeves, aluminum foil wraps, and custom drain wires. Our testing protocols verify characteristic impedance, insertion loss, and return loss to guarantee error-free data flow.
The future of wire harness assembly lies in active diagnostic capabilities. By embedding temperature, current, and strain sensors directly into the harness branch points, we enable real-time health monitoring of electrical systems. This predictive maintenance capability is highly sought after in industrial automation and aerospace applications.
To eliminate human error in high-volume production, STHL utilizes fully automated wire stripping, crimping, and sealing machines. Each crimp is monitored in real-time using Crimp Force Monitoring (CFM) systems, which detect micro-deviations in wire cross-sections or terminal alignment, ensuring 100% mechanical and electrical reliability.
Tailored electrical harness and PCBA integration services designed to meet the strict regulatory and operational demands of key global sectors.
We manufacture robust wire harnesses and PCBAs for ADAS, infotainment systems, battery management systems (BMS), and powertrain controls. Our processes comply strictly with IATF 16949 standards, ensuring thermal stability and vibration resistance under harsh automotive environments.
For life-critical medical equipment like ventilators, patient monitors, and diagnostic imaging systems, we provide ISO 13485 certified assembly. We utilize medical-grade, biocompatible materials and maintain strict cleanroom-like manufacturing disciplines to guarantee zero-defect performance.
Heavy machinery, control panels, and power distribution units require heavy-duty wire harnesses that resist chemical exposure, abrasion, and extreme temperatures. Our assemblies feature ruggedized overmolding, IP67/IP68 rated connectors, and high-flex cabling for dynamic applications.
Operating from Shenzhen, the global epicenter of electronics manufacturing, STHL leverages a highly integrated local supply chain to deliver unmatched efficiency and cost advantages.
Our Factory 4.0 transition integrates Manufacturing Execution Systems (MES) to track every step of the assembly process, from component receipt to final functional testing. This digital thread ensures complete traceability, allowing us to pinpoint the exact batch, machine, and operator involved in the creation of each harness or PCBA.
By maintaining strategic partnerships with authorized component distributors worldwide, we mitigate the risks of counterfeit parts, material allocation, and logistics bottlenecks. Our automated warehouse management system (WMS) guarantees optimal storage conditions (temperature and humidity control) for moisture-sensitive components, preserving their long-term reliability.
Direct access to raw materials, specialized connectors, and advanced PCB substrates enables us to compress lead times by up to 30% compared to Western manufacturers.
Bridging the gap between offshore manufacturing efficiency and localized engineering, quality, and regulatory compliance.
All our cable and wire harness assemblies are manufactured and inspected in strict accordance with the IPC/WHMA-A-620 standard. For aerospace, military, and medical applications, we build to Class 3 (High Performance/Harsh Environment Electronic Products) requirements, ensuring continuous performance where equipment downtime is not an option.
We ensure that all materials used in our production processes—including wires, terminals, heat-shrink tubing, and solder paste—are fully certified and compliant with environmental regulations. We provide complete documentation, including material test reports and certificates of conformance (CoC), to facilitate seamless customs clearance and market entry.
How to streamline your request for quote (RFQ) process to secure the best lead times, quality, and pricing from STHL.
Find quick answers to common queries regarding our manufacturing capabilities, quality standards, and ordering processes.
High-performance control boards, power converters, and communication modules manufactured to exact specifications.
STHL PCBA