PCB Assembly Services from Prototype to Production

We combine automated SMT, THT and mixed-technology assembly to produce reliable PCB assemblies across a wide range of component types and production volumes. As a PCB assembly supplier and PCB assembly manufacturer, we cover the full circuit card assembly process—from printed circuit board assembly for single prototypes to high-volume production boards.

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Precision Begins With Solder Paste

The assembly process starts with controlled solder paste printing.

A precision stencil is used to apply the correct amount of solder paste to each PCB pad.

Key parameters include:

Paste volume
Paste height
Alignment
Pad coverage
Printing consistency

Industrial automated odd-form component insertion machine featuring green vibratory bowl feeder, signal tower light, and operator control screen

SPI—Solder Paste Inspection

Before components are placed, solder paste is inspected to identify potential defects at an early stage.

SPI checks:

Volume Height Area Offset Shape

Early detection helps prevent defects from moving further down the production line.

Macro view of multi-axis pneumatic insertion cylinders and mechanical grippers inserting through-hole components onto circuit board

Automated Component Placement

High-speed pick-and-place equipment accurately places components onto the PCB.

Supported component technologies include:

Resistors Capacitors ICs LEDs Connectors QFN Fine-pitch components

Close-up of high-speed SMT pick-and-place multi-spindle placement head, pneumatic lines, and precision linear guides on surface mount assembly machine

Reflow Soldering

After component placement, boards pass through a controlled reflow process.

Preheat

Soak

Reflow

Cooling

Temperature profiles are controlled according to PCB materials, component requirements and soldering specifications.

THT Assembly

For components requiring through-hole mounting, THT assembly is performed after SMT or according to the product’s manufacturing process.

Typical applications include:

Connectors
Relays
Transformers
Power components
Terminal blocks

Industrial macro view of high-density SMT component tape feeder bank loaded in numbered slots under precision placement head

Wave & Selective Soldering

Depending on the product design, THT components can be processed through:

Wave soldering Selective soldering

The process is selected according to component configuration and assembly requirements.

High-precision automatic SMT solder paste stencil printing machine with open hood, PCB conveyor, and optical alignment control monitor in cleanroom workshop

Fine-Pitch & Advanced Package Assembly

Advanced component packages require tighter process control.

Our assembly process supports technologies such as:

QFN CSP Fine-pitch ICs

Inspection and process controls help maintain soldering quality for high-density PCB assemblies.

Macro industrial photo of automatic through-hole insertion machine inserting LED diodes and resistors into multi-strip circuit board panel under focused light

Assembly Inspection

Completed assemblies undergo inspection before entering electrical and functional testing.

AOI
X-ray inspection
Visual inspection

Close-up of multi-spindle automatic odd-form component insertion machine inserting connectors and parts onto green PCBA board

Frequently Asked Questions

What is mixed-technology (SMT + THT) assembly?

A single PCB using both SMT and THT. Many real products complete SMT first, then through-hole insertion and soldering; the exact order is determined by the product and process.

What component sizes can you assemble?

From ultra-small passives such as 0201 up to QFN, LGA, and larger through-hole components—the line covers fine-pitch placement as well as connectors and transformers.

Do you design stencils for our boards?

Yes. Aperture design affects paste release and joint formation, so fine-pitch, QFN, and thermal-pad areas are optimized against pad design, paste, and the board surface finish—ENIG, HASL, or immersion tin.

Which material-ownership model works for us?

Turnkey (we source everything), partial turnkey (you supply critical parts), or consigned (you supply the board and components)—the model is matched to your parts control and lead-time needs.