Final Assembly Box Build PCB Assembly Manufacturer

Here comes a regular product of PCBA, Final Assembly Box Build. We involved in designing(shematic, stucture, BOM, Gerber) and producing(PCB Fabrication, PCB Assembly, Final Assembly, Box Build).

PCBA-Final Assembly (6)


PCBA-Final Assembly (4)

PCBA-Final Assembly (5)

This is a regular project we producing, applied in financial devices.

ENIG, Rigid FR4 PCB, double side assembly.

If need Final Assembly, Box Build, PCB Assembly, Hardware Design, Design for Manufacturing Query, we are here for you!

tmliir Nov 13, 2017 Component, PCB, PCBA&SMT&PCB Assembly 0 Comment Read More

Original Electronic Components is important!


components (3)


It’s important to ensure the products quality during the PCBA processing, not only control
the processing process, but also control the components from sourcing, to ensure that the
electronic components are original authentic. Now there are some unscrupulous businessmen
through the purchase of counterfeit brand components on the market, and then sell with high
profits, resulting in some of the PCBA factory damage.So how to ensure the electronic
components are the original?

Electronic Components

To ensure that the electronic components in the PCBA machining process is original, below
are 2 ways to identify them.

1.the qualification of agent

Now,electronic components agents, trade quotient numerous, quality and price level in the
sales maket is uneven, to ensure that the electronic components of the original authentic,
which can through the enterprise’s official website to see whether there is an agent with
qualification, and purchased through formal channels.

Generally, agents have the qualification and controled by the original factory, to ensure
that the source of electronic components is original

2. reputation and credibility

Generally, the distributors and traders are in good reputation and credibility, their
components are not bad. Because an enterprise’s reputation and credibility of the
accumulation is to go through a very long time, accompanied by recognized brand
manufacturers, basically their components are not counterfeit.

Three/incoming inspection of material

In addition to the above two steps, there is a very important step is the incoming
inspection of components.The normal PCBA processing manufacturers to just buy the
components with incoming inspection, sampling components or full inspection, to ensure the
quality of the components.

When sourcing the electronic components, need to be ware of the top mark,the production
batch number, and other related components to beta appearance and physical details, in
order to ensure that the electronic components is the original authentic.

tmliir Jun 07, 2017 Component, FPC, PCB, PCBA&SMT&PCB Assembly 0 Comment Read More

Conformal Coating Process China Factory


  1. Conformal Coating Introduction
  1. Application of Conformal Coating
  1. Coating Material and Cured Thickness Check
  1. Coating Process Flow
  1. Machine Capability And Settings
  1. Coating Inspection Guideline


Conformal Coating Introduction

1.    Conformal coatings protect electronic printed circuit boards from moisture and contaminants, which cause short circuits and corrosion of conductors and solder joints.

2.  Moisture accelerates the electro migration of metal between conductors, damaging the circuitry of uncoated PCBs. Thus conformal coating is to be applied on PCBA in order to avoid:

a. Abrasion

b. Mechanical and thermal stress

c. Moisture and Solvents

d. Dirt and dust

e. Insects and rodents

3. Improve the electrical insulation resistance of the circuit board.


Application of Conformal Coating

Target Markets

Automotive assemblies

Captive Manufacturer’s/OEM’s

Consumer Products

Military & Aerospace systems

Target Markets  – Automotive assemblies  –	Captive Manufacturer’s/OEM’s  –	Consumer Products  –	Military & Aerospace systems


As Electronic Assemblies continue to be placed in harsher environments,

the need for selective coating will continue to grow.


Coating Material and Cured Thickness Check

Coating Material Introduction

Ideal Conformal Coating

  • One part product
  • Low viscosity
  • Spray, dip, select, or flow-coat
  • Long pot life
  • Rapid cure
  • Sufficient under component cure
  • Repairable
  • Wide range of operating temps
  • Non – toxic
  • Low cost
  • Robust adhesion

Common Conformal Coating Materials

Conformal coating material

Coating Material and Cured Thickness Check

1.  Coating material viscosity:


2.  Cured coating material thickness :


Method: Spray the coating material on the copper board with normal coating program, and measure the thickness after it’s fully cured by curing oven.

Standard Range: 25 um~125 um

Coating Process Flow




Machine Capability And Settings

  • Automated programmable spray equipment
  • Moderate to high volume
  • Often eliminates masking, <1% waste (over spray)
  • Higher capital cost than hand spray or dip
  • Less labor cost than hand spray or dip
  • Application bulletins for major equipment available (Nordson, PVA, SCS, Asymtek )
  • Parameters affecting thickness
  • Material characteristics (viscosity, self leveling, cure rate)
  • Dispensing pressures
  • Head design
  • Head travel speed
  • Capability to dispense non flow bead for keep out area


Operation Panel

1. Program edit panel


2. Coating working panel


Curing oven:


Thermal cure schedules are generally a function of heat and time. For example, a typical thermally cured coating may require 10 minutes exposure at 100°C, or 30-40 minutes exposure at 65°C, complying with manufacturer’s recommendations.

Note: some material added the fluorescence for better inspection with UV light.



Coating Inspection Guideline

Coating PCB area:


–This area usually includes: soldering pads and circuit traces.

— Edge tolerance of coating deposit is up to ±1.5mm. Increasing coating area improves edges accuracy due to better definition of coating deposit along stripe length.


— Wherever is possible, build the coating program using long stripes for improved varnish deposit accuracy alongside coating stripes.

— Coating areas should be kept square or rectangular (90° corners) due to dispensing process limitations.

— Via holes have the potential to transfer coating material from coated side to opposite uncoated side. In many cases, this should be allowed as long as the material does not flow into a keep-out area or interfere with the design. The flow of material will create a visual imperfection: coating deposit will show “thinning of material” around the via hole and the opposite side will show an excess of material on the via hole.


— Usually component’s insulating body (plastic, ceramic, etc.) is not required to be coated. However, chip components with a height lower than 1mm are recommended to be coated entirely.



— Component’s corners and tip of pins whose height is larger than 1.8mm can not be considered covered with conformal coating due to physical properties of coating material that flows down to reach mechanical stability.


— Thickness of coating deposit should range between 25µm and 125µm and might not be uniform due to board’s relief (components, vias).

— Components and PCB areas masked by large components, covers, shields, daughter boards, etc. cannot be coated.


We experienced on the conformal coating process to ensure our client’s products more stable. If need PCB, FPC, Aluminum PCB, Copper base PCB manufacturing, and PCB Assembly, pls contact us!

tmliir May 24, 2017 Component, PCBA&SMT&PCB Assembly 0 Comment Read More

Parts Management


We have built an effective component sourcing system for low cost electronic assembly. A dedicated team takes care of your PCB components procurement and parts management.

We offer:
Kitted PCB Assembly
Material Inventory Management
Sourcing Your Hard-To-Find Parts
Part Crosses and Substitutions
Unique Global IC Sources
Parts Incoming Check
IC Programming
Electrical Characteristic Analysis
Quick BOM Pricing in 24 hours
Lowest Surcharge Rate

The parts you specified are ordered for each of your assembly needs, if other option exists that is cost saving and reliable, we will offer a alter of choice. A highly systematic and organized, PCB parts purchasing process is followed. We handle the entire logistics of parts and materials, and manage the procurement systems.

Sourcing the best electronic components from high quality vendors and global distributors. Components are procured based on our clients’ authorized suppliers and manufacturers. We have established strong relationships with major electronic components distributors including Arrow Electronics, Avnet, DigiKey Electronics, Farnell Company, Future Electronics, Mouser Electronics, Newark, and Samtec. You are assured of the utmost quality and optimal value for your PCB procurement investment. No substitutions are ever made without your approval.

Normal parts sourcing time is usually completed within 2 weeks from the date the parts are ordered. All parts accepted in inventory storage facilities are tested for quality. A sampling of ICs also are analyzed for Electrical Characteristics.

tmliir Dec 30, 2016 Component, PCBA&SMT&PCB Assembly 0 Comment Read More

Function Test


Functional Testing (FCT) is a necessary process within the turn-key assembly services. Functional testing usually is applied after the circuit boards are assembled and AOI & visual inspections are finished.

Functional testing is done mainly to avoid assembly issues including shorts, opens, missing components or the installation of incorrect parts. Customers can deliver a perfect product to their clients.

Functional testers usually use a computer that is connected to test points or a test-probe point in order to perform FCT. We determine if the boards pass or fail based on whether or not the test results meet the specified requirements by operating the software or firmware.

Functional testing is enabled by testing software, often referred to as firmware, and testing instruments such as digital multimeters, input/output PCBs, communication ports. Automated computer-based Functional Testing (FCT) is accomplished by assembly line operators who utilize testing software that interfaces with external instruments to monitor the devices under test.

Early testing enable us to find and correct the component failures, assembly defects or potential design issues at an very early stage and make troubleshooting as quick as possible.
We will preview client’s requirements such as test scope and test instruction, design the test jig if necessary, set up the instruments, and prepare the test report form and design testing workflow.

Equipped with an adjustable DC power supply, a 200MHz digital oscilloscope, a signal generator, an LRC multi-meter and a universal programmer. This covers most embedded system testing. The test results can be either collected by a computer or recorded manually. If the board does not pass the testing, a troubleshooting program will be launched to find the root cause of the failure. A Design For Assembly (DFA) form will be issued by our process engineer and an 8D quality assurance report will be created by our quality engineer. The DFA report will be sent to the customer as a design reference. This will become our quality improvement guideline.

By all these processes, we serves every customer well of their products also their special design needs. This is done by communication and the chasing of perfect product by both sides.

tmliir Dec 30, 2016 Component, PCBA&SMT&PCB Assembly 0 Comment Read More

LED’s Definition


LED’s Definition

LED is abbreviation of light-emitting diode, it including gallium (Ga),
arsenic (As) phosphorus (P) and nitrogen (N) and other compounds. LED
is a semiconductor device that emits visible light when an electric current
passes through it. Costs less power, more efficient and longer lifespan
than most other light elements. Unlike incandescent lamps, LEDs have no
filaments that can burn out or fail.

LED applies in LED Display/Screen

Indoor LED Displays: SMD Red Green Blue LEDs in one package. Some
outdoor displays do utilize SMD LEDs.

SMD LED Advantages:
Wide-viewing angle
No color shift at extreme viewing angles
Smooth color from short distance

Outdoor LED Displays: DIP Individual Red Green Blue LEDs

DIP LED Advantages:
Weather proof
Extremely bright
Great for longer viewing distance

tmliir May 07, 2015 Component, LED Display 0 Comment Read More
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