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PCB Assembly

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What is PCBA Manufacturing?

PCBA is the abbreviation of Printed Circuit Board Assembly.

PCBA manufacturing attaches electronic components to a Printed Circuit Board by SMT production and through hole assembly.

This process involves a combination of automated and manual tasks such as soldering, surface mount technology (SMT), through-hole technology (THT), and quality inspection. PCBA manufacturing is an essential step in the development of electronic devices.

Circuit Open/ Short Test

The last step of rigid PCB manufacture is an open/short circuit test to ensure the quality of the rigid PCB board.

General samples and small batches of rigid PCB circuit boards are tested with flying probes, which can reduce the cost of making test frames and then shorten the delivery cycle. The mass-production rigid PCB boards are tested by test tooling.

The PCBA Manufacturing Starts From PCB Design

PCB Design Preliminary Preparation

PCB board size and layer count must be determined in the early stages of PCB design. The layer count will directly affect the PCB routing and impedance. The PCB dimension will help to achieve the purpose of PCB design.

PCB Layout Design

In the PCB design process, the first is the correct layout, which is the most basic PCB design entry requirement. Secondly, the electrical performance, which is a measure of a PCB board, is a qualified standard. Once again, optimize the PCB circuit routing to meet test convenience, neat and tidy.

DRC Inspection

Quality control is an important part of PCB design. It includes Self-inspection, mutual inspection, special inspection, etc. Check whether the empty foot of each component is normal and whether it is a leakage line. Check whether the upper and lower wiring of the same network table has holes, and whether the pads are connected through the holes to prevent wire breakage and ensure the line's integrity.

The Second Step Is PCB Board Manufacturing

The following are the main production procedures of conventional multilayer boards.

Material Cutting:

Cutting material is the large area (48in * 42in) of raw material that is cut into the working panel board that PCB manufacturers need.

Inner Layer:

The inner layer of the circuit uses positive imaging technology. After developing, etching, and de-filming processes, complete the production of the inner layer of the line.

Black Oxide:

Black Oxide is made before lamination. The main role is to roughen the copper surface and increase the surface contact area with the resin to ensure lamination quality.


Stack up the inner core and prepreg to press into a multilayer board through a vacuum pressure machine. And make the tooling holes for the next process.
Drilling: A CNC drilling machine dries holes for circuit connections between layers.

Electroless Copper:

Electroless copper is chemically deposited, copper. The method deposits a thin copper layer in the non-conductive substrate so that the through-holes are metalized. Then, the plating method thickens the hole's copper thickness to achieve the design purpose.

Copper Plating:

Copper plating is a method of electroplating to increase the thickness of through-holes and circuit surfaces.

Outer layer:

Transfer the outer pattern onto the copper-clad plate and etch the useless copper.

Solder Resist Character:

Printing a layer of insulated solder mask ink on the outer layer surface. Some PCBs also need to be printed symbols on the solder mask layer.
Surface treatment: Common PCB surface treatments include HASL, OSP, Immersion Gold, ENEPIG, Immersion Silver, Immersion Tin, and Gold finger plating.

Electrical Test:

All the PCBs must be pen/short tested before outgoing, including an electrical test and flying probe test. Electrical test for PCB mass production and flying probe test for samples as it's fast turn round.

Types of PCBA Manufacturing

There are two main types of PCBA manufacturing: Surface Mount Technology (SMT) and Through-Hole Technology (THT).

Surface Mount Technology (SMT)

Printed Circuit Board SMT assembly is a circuit assembly technology that solders components to the surface of a Printed Circuit Board by reflow soldering or dip soldering. SMT PCBA manufacturing is typically used for compact, lightweight, and high-density electronic devices, such as smartphones, tablets, and laptops.

Through-Hole Technology (THT)

Through-hole Printed Circuit Board assembly also named DIP involves inserting electronic components through pre-drilled holes in the PCB, and then soldering the leads to the other side of the board. A through-hole printed circuit board assembly is used for heavy-duty electronic devices, such as industrial equipment and high-end audio gear. Most electronic devices are a combination of both SMT and THT assembly methods to achieve a balance between size, weight, and durability.

Characteristics of PCBA manufacturing

Here are some characteristics of PCBA manufacturing.

Density Assembly

The Printed Circuit Board assembly can be a high-density, lightweight, and small volume of electronic products. Generally, the volume of electronic products is reduced by 40%-60%, and the weight is reduced by 60%-80% after using the SMT process.

High Reliability

PCBA manufacturing has high reliability, strong vibration resistance, and low solder joint defect rate.


PCBA manufacturing has strong anti-interference ability and better electromagnetic compatibility.


Most PCBA manufacturing is automated using specialized machinery. This not only increases production efficiency but also ensures consistency and accuracy, and reduces material costs and manpower time.

Materials of PCBA manufacturing

PCBA manufacturing mainly uses three major materials: solder paste, flux, and SMT glue.

Solder Paste

Solder paste is made of alloy solder powder and paste flux evenly stirred. It is an indispensable soldering material in the SMT chip processing process and is widely used in reflow soldering. Solder paste has a certain viscosity at room temperature and can be electronic components initially stuck in the established position.


Flux is the carrier of tin powder, and its composition is basically the same as that of general-purpose flux. To improve the printing effect, it is sometimes necessary to add an appropriate amount of solvent, through the action of the activator in the flux.

SMT Glue

SMT glue, also known as SMT adhesive, or SMT red glue, is usually a red (also yellow or white) paste that is evenly distributed with hardeners, pigments, solvents, etc. mainly used to fix the components on the printed board. Generally, we use the method of dispensing or stencil printing to distribute, and then put the components into the oven or reflow oven to heat up and harden.

PCBA Fabrication Capabilities

Item Technical Parameters    Specification
Min Circuit Line Width/Space 3/2.7 mil Finished Copper Thickness H oz
Min PCB Pad Ring of Via  3 mil  Distance between hole edge to ring outskirt 
 Min PCB Pad Ring of PTH 5 mil  Distance between hole edge to ring outskirt  
 Min PCB Via Size 4 mil  Board Thickness < 1.2 mm 
 Min PCB Thickness of Double sided 0.2 mm  Final Board Thickness
Min PCB Thickness of Multilayer 0.4 mm Final Board Thickness
Max PCB Thickness  8.0 mm  Final Board Thickness 
 Max PCB Dimension 609×609 mm  Single and Double Sided  PCB
 Space Between Line to Board Edge 10 mil  Milling of Outline 
 Max PCB Layers 30 Layer   
PCB Solder Mask Color Green, Black, Blue, Red, White, Yellow  
PCB Silkscreen Color White, Black, Yellow  
PCB Surface Finishing HASL, ENIG, ENEPIG, ImAg, ImTin,OSP, Hard Gold Plating  
Max Finishing Copper Thickness 6 oz  
Dielectric Thickness 2.5 mil  
PCB Material FR-4,Aluminium substrate,Rogers4350C,Polyimide  
Special Technology HDI PCB, Via in Pad PCB, Blind&Buried PCB  

How to make PCBA manufacturing?

Solder Paste Printing

Accurately apply solder paste or adhesive onto the PCB pads in preparation for component placement. There are three types of solder paste machines: manual printing machines, semi-automatic printing machines, and fully automatic printing machines.



Utilize the equipment-edited program to position the components precisely on the designated locations of the PCB. The placement machine involves a high-speed placement machine and a multi-function placement machine. High-speed placement machines are generally used to mount small chip components. The multi-function placement machine is mainly used to mount roll-shaped, disc-shaped, or tubular large components or abnormally shaped components.


Positioned behind the placement machine in the SMT production line, this device creates a heated environment that facilitates the melting of solder paste on the pad. As a result, surface mount components and PCB pads are firmly bonded together using solder paste.


When AOI is automatically detected, the machine scans the PCB through its camera, automatically collecting images. It then compares the tested solder joints with qualified parameters stored in the database, and it checks for PCB defects through image processing. Any defects are displayed and marked on the display, allowing maintenance personnel to identify and repair them quickly.

The Application of PCBA Manufacturing

PCBA manufacturing is an important technology that enables the development of complex electronic devices used in various industries and applications. Below are some common applications.

Consumer Electronics

PCBA manufacturing is used in various consumer electronics, including smartphones, tablets, laptops, televisions, and home appliances.


PCBA manufacturing is used for electronic control units, sensors, and other critical components in automotive applications.

Industrial Automation

PCBA manufacturing is used in industrial automation applications for controlling machinery, monitoring sensors, and handling data.

Medical Equipment

PCBA manufacturing is used in medical equipment for patient monitoring, diagnostics, and treatment.

Aerospace and Defense

PCBA manufacturing is used in aerospace and defense applications for controlling and monitoring aircraft systems, satellite communication, and military equipment.

Why choose us?

PCBA manufacturing in King Sun can offer a combination of affordability, quality, and scalability, making it an attractive option for businesses. There are several advantages of PCBA manufacturing in King Sun.

Low Cost

PCBA manufacturing in King Sun is typically much more cost-effective than in many other factories, due to the lower cost of labor and materials.

High Quality

Despite the lower cost, PCBA manufacturing in King Sun can still be high quality. We imported production and testing equipment from the United States, Japan, and other countries to help companies improve PCBA manufacturing and testing capabilities.

Large-scale Production

King Sun is one of the largest producers of Printed Circuit boards and PCBA in China, which means that it can produce large quantities of circuit boards and PCBA manufacturing quickly and efficiently.


King Sun has experience producing circuit boards for various applications and industries, including automotive, telecommunications, and consumer electronics. This means that we can scale our production to meet the needs of different clients.

Fast Turnaround

King Sun has our own Printed Circuit Board factory and assembly factory, so the lead times can be much faster than other suppliers, which can be a significant advantage for clients who need their products quickly.