Custom PCBA Services

STG Electronics Co., Ltd. provides professional PCB assembly services, single-sided PCB, double-sided circuit board, multi-layer circuit board and other PCB proofing, expedited circuit board proofing.

Professional custom PCB board assembly:

1. PCB fabrication

2. PCBA, PCB assembly: SMT & PTH & BGA

3. PCBA and enclosure design

4. Components sourcing and purchasing

5. conformal coating

6. Final assembly

7. Global Logistics

8. Test: AOI, In-Circuit Test (ICT), Functional Test (FCT)

9. customized packaging

10. Custom clearance for material importing and product exporting

Our pcb assembly advantages

pcb production


2.24 hours quick turn prototype

3.prototype&mass production

4.on time delivery

5.100% electrical test gurantee

6.competitive price

pcb assembly

1.SMT&PTH assembly

2.fine pitch BGA QFN smallest 0201 package

3.Bonding assembly

4.AOI&X-ray inspection

5.ICT function testing MOQ requirements

7.over 150 speedy samples can be processed within 1

8.working day

9.40 million to 80 million SMT points each month

one-stop turnkey service

1.components sourcing

2.SMT stencil

3.SMT&Through holes assembly

4.cable assembly

5.conformal coating programming

7.functional testing

8.enclosure assembly

9.customized packaging

PCBA testing

PCBA testing is a key step to ensure the quality of production and delivery. The types of testing are mainly divided into the following types:

ICT (In-Circuit Test) test: mainly to test the voltage/current data of the test point after the PCB circuit board is powered on, and does not involve the test of function keys or input and output.FCT (Functional Test) test: It is necessary to burn the written microcontroller (MCU) program into the program IC through the programmer (such as ST-Link, JTAG), so as to realize the corresponding functional test. For example, after pressing the button, the LED light is on; pressing the two buttons at the same time will restore the factory settings, etc. Of course, whether the test of all functions can be carried out must be based on the premise that the PCB soldering is OK and the circuit is connected, otherwise it cannot be realized.

Burn In Test: For the PCBA board that has been programmed and FCT passed, simulate user input and output for a long time and periodically to test its durability and soldering reliability. In special cases, it is also necessary to expose the PCBA board to a specific temperature and humidity environment.

Program burning

We support offline programming and online programming, IC types include: eMMC, eMCP, MCU/MPU, EPROM, EEPROM, Serial EPPROM, FLASH, MCP, PLD/CPLD, etc. IC packages include: DIP, SDIP, SOP, SSOP, PLCC, MLF, TSOP, TSSOP, BGA, QFP, etc. IC Packaging: Tary, Tube, Tape

DIP plug-in soldering

The technological process of DIP plug-in processing can generally be divided into: component forming and processing → plug-in → wave soldering → component cutting → repair welding (post-welding) → board washing → functional testing

Three anti-paint spraying

Conformal paint is a specially formulated coating used to protect circuit boards and related equipment from environmental erosion. The three-proof paint has good high and low temperature resistance; after curing, it forms a transparent protective film, which has excellent insulation, moisture-proof, anti-leakage, shock-proof, dust-proof, anti-corrosion, anti-aging, corona resistance and other properties. In order to meet the needs of customer products for harsh environment applications such as humidity, temperature, and corrosiveness, our professional conformal paint spraying production line includes a fully automatic one-stop mode including spraying equipment, UV testing, and baking.

Introduction of craft capability

Laminate MaterialsFR4, high TG FR4, high frequency, alum, FPC
Board CuttingNumber of layers1-30
Min.thickness for inner layers0.003”(0.07mm)
(Cu thickness are excluded)
Board ThicknessStandard(0.1-4mm±10%)
Bow and twistno more than 7/1000
Copper WeightOuter Cu weight0.5-4 0z
Inner Cu weight0.5-3 0z
DrillingMin size0.0078”(0.2mm)
Drill deviation±0.002″(0.05mm)
PTH hole tolerance±0.002″(0.005mm)
NPTH hole tolerance±0.002″(0.005mm)
Solder MaskColorGreen,white,black,red,blue…
Min solder mask clearanace0.003″(0.07mm)
Min size0.006″(0.15mm)
Component SourcingYes
Tolerance of PCB±5%
Max Size of Finish Board700*460mm
MOQNO MOQ (1pcs)
Surface FinishHASL,ENIG,immersion silver,immersion tin,OSP…
PCB OutlineSquare,circle,irregular(with jigs)
Min Line/Space0.075/0.075mm

ESD Packaging & Global Logistics

we are continuously delivering cutting edge technology and advancing supply chain logistics solution for the semiconductor industries domestically and globally, while setting the standard for others to follow. value-added services and engineering solutions are met in order to meet the global electronics manufacturers daily supply needs. Our worldwide distribution channel, state-of-the-art Enterprise Resource Planning (ERP) and warehouse management support system enables us to handle the dynamic demands from customer's requirements.