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.
The rapid evolution of Industrial IoT, automotive electrification, and high-frequency communication protocols requires electronics manufacturing partners who can scale seamlessly while maintaining absolute regulatory compliance. Global commercial markets demand quick iteration cycles, where prototypes transition to high-yield mass production lines without quality bottlenecks.
From smart meters and power distribution units (PDU) to sophisticated motor controllers, modern industrial setups depend on high-reliability board assemblies. Our systems are engineered to withstand wide thermal limits, continuous operation cycles, and electromagnetic interference typical of high-current installations.
Regulatory hurdles for medical electronics require clean trace routings, precise component solder integrity, and traceabilty logs. Certified under ISO 13485, STHL handles high-risk diagnostic assemblies including ECG monitors and infusion pump boards, assuring medical-grade failure rates.
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:
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 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.
Our wastewater monitoring equipment PCBAs are deployed in harsh localized water treatment stations globally. These assemblies utilize protective conformal coating (silicone or polyurethane) to prevent humidity oxidation, chemical corrosion, and leakage under variable industrial loads.
Smart infrastructure and localized server farms require resilient Power Distribution Units. We build thick copper PCBs capable of handling heavy electrical thermal stress, ensuring consistent power rail regulation with integrated over-current sensing circuits.
Smart Blood Glucose Monitors and localized ECG devices need ultra-miniaturized, low-power, high-accuracy layouts. Our SMT capability placements handle micro-BGA packages down to 0.3mm pitches, coupled with SPI and automatic X-ray inspection to prevent soldering voids.
Whether designing ECUs for localized vehicle segments or scooter controllers, vibration resistance is vital. We utilize high-Tg PCBs, heavy solder fillets, and specialized automotive grade component positioning to survive high-impact vibration and thermal shock cycles.
Security screening equipment, metal detectors, and commercial DVR devices operating in distributed environments demand constant uptime. Our IPC Class II/III production standards eliminate field maintenance issues by strictly testing each system under thermal chambers and high-voltage burn-in profiles.
As technology trends shift towards high-frequency applications, automotive radar systems, and IoT miniaturization, STHL continuous engineering improvements focus on the following core technological milestones.
Expanding the limits of multi-layer microvia design (including blind and buried vias) down to 2-mil trace widths and spaces. This accommodates high-performance computing, processing engines, and 5G networking modules without loss of signal fidelity.
Reducing external board footprints by embedding passives directly inside PCB substrates. This minimizes parasitic inductance, enhances thermal dissipation, and delivers optimal signal integrity for aerospace and modern automotive controllers.
Integrating artificial intelligence models into Automated Optical Inspection (AOI) and 3D Solder Paste Inspection (SPI) to detect solder defects in real-time. This predictive analytics environment minimizes line downtime and ensures defect-free output.
Operating from Shenzhen, the global epicentre of electronics manufacturing, STHL leverages a vast localized ecosystem of raw material providers, substrate fabricators, and component distributors. This concentration delivers distinct cost and schedule advantages:
Automotive process safety control and medical device quality standards form the core of our management routines. Every production stage is logged, guaranteeing process reproducibility and component trace audit paths.
All our assembly processes strictly follow the RoHS and REACH directives. Lead-free solder compositions (e.g., SAC305) and ecologically compliant waste management protocols protect both product users and the global environment.
We assist our clients with customs declarations, export control compliance, and secure sea/air shipping logistics. Our customer base spans over 90 regions, demonstrating our ability to navigate diverse trade rules.
STHL PCBA
