China Pcb Board Assembly Manufacturer & Service

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STHL PCBA Market & Services

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.

Established in 2006, STHL has built nearly 20 years of experience in electronics contract assembly manufacturing. Our operations are housed in a modern 10,000 sqm facility, staffed by over 220 skilled workers. The production site features 7 high-speed SMT assembly lines, 2 DIP/THT lines, 2 functional testing (FCT) lines, and 2 dedicated box-build integration 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.

Industrial Scale & Production Benchmarks

Decades of electronic manufacturing excellence backed by scalable production infrastructure and rigorous global quality standards.

20+

Years Experience

10k+

SQM Facility

220+

Professionals

7 SMT

Advanced Lines

Expertise in SMT PCB Assembly

Modern electronics demand higher density, lighter weight, and faster processing speeds. At STHL, our Surface Mount Technology (SMT) lines are designed to handle complex component architectures. We place high-density parts with absolute positioning accuracy, ensuring thermal and electrical performance.

We can handle a wide range of advanced components, including:

Ball Grid Array (BGA) and Ultra-Fine BGA (uBGA): Precision placement of micro-pitch BGAs, down to 0.3mm pitch spacing, ensuring reliable solder joint formation under controlled thermal profiles.
QFN, QFP, SOIC, and PLCC Packages: Efficient, high-accuracy processing of quad-flat leadless packages and quad flat packages with zero-defect lead coplanarity.
Package-on-Package (PoP) and Small Chip Packages: Equipped with sophisticated multi-tier placement capabilities to manage high-density 3D electronic assemblies with tight pitch limitations.

Our quality control processes include 3D Solder Paste Inspection (SPI), Automated Optical Inspection (AOI), and high-resolution 3D X-Ray inspection. These systems allow us to analyze internal solder connections, identifying and fixing potential issues before the product moves to functional testing.

Through-Hole Technology (THT) Assembly Strength

For power electronics, heavy industrial machinery, and automotive systems, Through-Hole Technology (THT) remains essential. THT joints provide stronger mechanical bonds, making them suitable for components that experience physical stress or high thermal loads. STHL maintains dedicated THT lines to support mixed-technology assemblies.

STHL PCBA excels in Through-Hole Technology (THT) assembly. Our services encompass:

Manual and Automatic Component Insertion: We combine manual precision with automated radial and axial component inserters to optimize both production speed and assembly quality.
Custom THT Assembly Fixtures: We design custom wave-soldering pallets and carriers to shield sensitive surface-mount components while ensuring uniform solder contact.
ESD and RoHS Compliant Soldering: Our production line operates within a fully grounded, static-safe environment (ANSI/ESD S20.20), utilizing lead-free wave soldering and selective soldering technologies.
Inspection and Functional Testing: THT assemblies undergo visual inspection, automated optical scanning, and functional testing to verify electrical connectivity and mechanical hold.

Our Comprehensive EMS Services

From initial design files to final product delivery, STHL provides end-to-end electronics manufacturing services that streamline your supply chain.

SMT/THT PCB Assembly

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.

PCB Fabrication

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.

Electronic Component Sourcing

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.

Cable Assembly

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.

Box Build Assembly

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.

Functional Testing

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.

Industrial Applications & Compliance Standards

Supporting complex requirements across medical, automotive, industrial, and telecommunication sectors with certified quality assurance.

Modern electronic assemblies must operate reliably under varied and often harsh environmental conditions. Devices like Air Data Computers (ADC), Inertial Navigation Systems (INS), and Surgical Navigation systems require high precision and durability.

STHL has aligned its manufacturing lines with strict international standards to ensure product quality and regulatory compliance:

ISO 13485 (Medical Devices): Our processes support the production of critical medical devices, including surgical systems and drug delivery controllers, maintaining clean production areas and complete component traceability.
IATF 16949 (Automotive Quality): We implement automotive production standards, including Failure Mode and Effects Analysis (FMEA) and Production Part Approval Process (PPAP), for components like Transmission Control Units (TCU).
RoHS & REACH Compliance: We offer lead-free processes to meet global environmental regulations, supporting eco-friendly electronics distribution.
IPC-A-610 Class 2 & Class 3: Our team is trained to meet IPC workmanship standards, producing assemblies that range from consumer grade to critical industrial grade.

Global Supply Chain & Component Traceability

Managing component selection, verification, and logistics to minimize project risk and support stable long-term production.

Material sourcing is a key factor in manufacturing efficiency and cost control. STHL's purchasing team works with a global network of authorized distributors, including Arrow, Avnet, Future Electronics, and DigiKey. This direct relationship helps protect clients from counterfeit components and supply chain delays.

Our component verification process includes:

Incoming Inspection: Solderability testing, microscopic checks, and batch verification to confirm component authenticity.
MSD Protection: Dry-cabinet storage and vacuum packaging for moisture-sensitive devices (MSDs) to prevent reflow delamination.
Alternate Component Sourcing: Identifying alternative parts to help manage lead times and keep projects on schedule.
End-of-Life (EOL) Tracking: Proactive identification of obsolete components to support smooth, long-term manufacturing lifecycles.

Technical Roadmap & Future Outlook

Adapting our facilities and processes to support next-generation electronics and smart factory automation.

As technologies like IoT, 5G, and high-performance computing evolve, PCB designs are becoming denser and more complex. STHL is updating its facilities to meet these changing industry requirements:

Advanced Micro-HDI SMT

Developing capabilities for finer spacing, supporting 0.2mm micro-BGA components and 01005 metric passives to enable smaller, high-performance product designs.

Process Automation

Integrating automated loading, laser marking, and robotic solder paste application to increase assembly speed and consistency.

High-Frequency RF Assembly

Adapting reflow profiles and assembly processes to handle delicate high-frequency materials, including Rogers and Teflon laminates.

Frequently Asked Questions (FAQ)

Answers to key questions regarding STHL's manufacturing capacity, component handling, and quality assurance processes.

Q1: How does STHL ensure component authenticity and prevent counterfeits?

We purchase directly from original component manufacturers (OCMs) or authorized franchise distributors. All incoming shipments undergo visual inspections, microscopic checks, and barcode verification. In critical cases, we use external laboratories for decapsulation testing to verify component authenticity.

Q2: What files are required to get a detailed assembly and fabrication quote?

Please provide your complete Gerber files (in RS-274X format), a Bill of Materials (BOM) in Excel format containing part numbers, values, footprints, and designations, along with any relevant assembly drawings or mounting coordinate files.

Q3: Does STHL support quick-turn prototype assembly and low-volume production?

Yes, our SMT lines are flexible and can switch setups efficiently. We handle both low-volume prototype builds for product development and high-volume mass production.

Q4: What certifications does STHL hold for automotive and medical electronics?

STHL is certified under IATF 16949 for automotive electronics manufacturing and ISO 13485 for medical device production. We also hold ISO 9001 and ISO 14001 certifications.

Q5: How are internal solder joints, such as those on BGA components, inspected?

We inspect internal solder connections using automated 2.5D and 3D X-Ray inspection systems. This technology helps identify internal solder bridging, voiding, and poor alignment.

Q6: What functional testing options are available at your facility?

We offer several testing options, including In-Circuit Testing (ICT), Functional testing (FCT) using custom fixtures, JTAG boundary scans, and high-low temperature burn-in testing.