Grandtop Group was established in 2005, specializing in high quality PCBA OEM & ODM,electronic product turnkey service ,and POS terminal manufacturing. Our headquarter and factory are located in Baoan District Shenzhen City, with 150+ employees and over 6000 m2 shop floor. Globally, we have offices and warehouses in Hongkong, London, Hungary and USA.
We have more than 10+ years' experience in PCBA contract manufacturing, professionally providing SMT, DIP, MI, AI, PCB assembling, conformal coating, final product assembling, testing, material procurement ,and one stop services such as wire harness, sheetmetal , plastic injection to make up complete product for customers. Our factory has a number of lines of SMT, assembly and testing, well-equipped with brand-newly imported Juki and Samsung SMT machine, full-automatic solder paste printing machine, ten temperature zone reflow oven and wave-soldering oven. Our factory is also equipped with AOI, XRAY, SPI, ICT, full-automatic splitting machine, BGA rework station and conformal coating machine, with air conditioner and dust-free workshop and lead-free manufacturing process. We have passed ISO9001:2015 international quality management system, IATF16949:2016 automotive industry quality management system and ISO13485:2016 medical device quality management system.
Our PCBA and products are widely used in industrial control, medical device, food equipment, laser module, communication device, PLC module, transducer module, traffic control, automobile, smart home system, smart POS. We cooperate with worldwide clients and have long-term cooperated customers in USA, Canada, UK, Germany, Switzerland, Australia etc. which can be your reference.
Our PCB Manufacturing Capacity
| Items |
Capability |
| OEM PCB Layers |
1-28 layers |
| OEM PCB material |
FR4, FR5, Aluminium,High Tg FR4, Halogen Free, Isola, Rogers |
| OEM PCB Finished Board Thickness |
0.2mm ~ 7.0mm(8mil-276mil) |
| OEM PCB Copper Thickness |
1/3oz ~ 7oz |
| OEM PCB Max gold plating thickness |
50 microinch |
| OEM PCB Min. Trace Width/Space |
0.075/0.075mm(3/3mil) |
| OEM PCB Min. Finish Holes Size |
0.1mm(4mil) for laser holes; 0.2mm(8mil) for mechanical holes |
| OEM PCB Max.Finshed Size |
600mm x 900mm (23.6" x 35.43" |
| OEM PCB Hole Tolerance |
PTH:±0.076mm(+/-3mil), NTPH:±0.05mm(+/-2mil) |
| OEM PCB Soldermask Color |
Green, White, Black, Red, Yellow, Blue,ect |
| OEM PCB Silkscreen Color |
White, Black, Yellow, Blue |
| OEM PCB Impedance Control |
+/-10% |
| OEM PCB Profiling Punching |
Routing, V-CUT, Chamfer |
| OEM PCB Special Holes |
Blind/Buried holes, Countersunk holes |
| OEM PCB Surface Finishing |
HASL, Lead Free HASL, Immersion tin, Immersion gold, Gold plating, Immersion silver, OSP, Carbon, etc. |
| OEM PCB Certificate |
UL, ISO9001, ROHS, SG |
Technical Capacity
| Item |
Rigid PCB |
Flexible PCB |
Rigid-Flex PCB |
| Max Layer |
60L |
8L |
36L |
| Inner Layer Min Trace/Space |
3/3mil |
3/3mil |
3/3mil |
| Out Layer Max Trace/Space |
3/3mil |
3.5/4mil |
3.5/4mil |
| Inner Layer Max Copper |
6oz |
2oz |
6oz |
| Out Layer Max Copper |
6oz |
2oz |
3oz |
| Min Mechanical Drilling |
0.15mm |
0.1mm |
0.15mm |
| Min Laser Drilling |
0.1mm |
0.1mm |
0.1mm |
| Max Aspect Ratio(Mechanical Drilling) |
20:01 |
10:01 |
12:01 |
| Max Aspect Ratio(Laser Drilling) |
1:01 |
/ |
1:01 |
| Press FFit Hole Tolerance |
±0.05mm |
±0.05mm |
±0.05mm |
| PTH Tolerance |
±0.075mm |
±0.075mm |
±0.075mm |
| NPTH Tolerance |
±0.05mm |
±0.05mm |
±0.05mm |
| Countersink Tolerance |
±0.15mm |
±0.15mm |
±0.15mm |
| Board Thickness |
0.4-8mm |
0.1-0.5mm |
0.4-3mm |
| Board Thickness Tolerance(<1.0mm) |
±0.1mm |
±0.05mm |
±0.1mm |
| Board Thickness Tolerance(≥1.0mm) |
±10% |
/ |
±10% |
| Min Board Size |
10*10mm |
5*10mm |
10*10mm |
| Max Board Size |
22.5*30inch |
9*14inch |
22.5*30inch |
| Contour Tolerance |
±0.1mm |
±0.05mm |
±0.1mm |
| Min BGA |
7mil |
7mil |
7mil |
| Min SMT |
7*10mil |
7*10mil |
7*10mil |
| Min Soler Mask Clearance |
1.5mil |
3mil |
1.5mil |
| Min Solder Mask Dam |
3mil |
8mil |
3mil |
| Min Legend Width/Height |
4/23mil |
4/23mil |
4/23mil |
| Strain Fillet Width |
/ |
1.5±0.05mm |
1.5±0.05mm |
| Bow&Twist |
0.003 |
/ |
0.0005 |
SMT PCBA assembly service Capacity
| Items |
Capacity |
| SMT PCBA Assembly Min. IC Pitch |
0.30mm(12mil) |
| SMT PCBA Assembly Foot Pin |
SO, SOP, SOJ, TSOP, TSSOP, QFP, BGA and U-BGA |
| SMT PCBA Assembly Min. Chip Placement |
201 |
| SMT PCBA Assembly Max. PCB Size |
410mm x 600mm(16.2" x 23.6") |
| SMT PCBA Assembly Maximum BGA Size |
74mm x 74mm(2.9" x 2.9") |
| SMT PCBA Assembly BGA Ball Pitch |
1mm ~ 3mm(4mil ~ 12mil) |
| SMT PCBA Assembly BGA Ball Diameter |
0.4mm ~ 1mm(16mil ~ 40mil) |
| SMT PCBA Assembly QFP Lead Pitch |
0.38mm ~ 2.54mm(15mil ~ 100mil) |
| SMT PCBA Assembly Method |
SMT, DIP, AI,MI assembly |
| SMT PCBA Assembly Certification |
ISO9001, ISO13485, IATF16949 |
SMT PCBA Packing:
| 1, |
Packaed into anti-static bag |
| 2, |
Bubble bg |
| 3, |
Carton |
| 4, |
Carton with strap |
Turnkey Electronics manufacturing Service
| pcb service |
PCB circuit design, PCB Layout, pcb manufacturing, pcb copy |
| PCB components |
PCB components advicing, PCB compoments sourcing |
| PCBA |
OEM PCB prototype assembly, pcb with components, |
| Testing |
PCBA AOI test, PCB Assembly BGA X-RAY test, PCBA ICT test, PCBA FCT test |
| Conformal coating |
Conforal coating via coatingmachine , and UV oven |
| Box Build |
BOX build, box assembly |
| Turnkey service |
wire harness, sheet metal, plastic |
FAQ
Q1: What files do you use in PCB and assembly Quotation?
A1: Gerber, pcb. Auto CAD + Bill of Material
Q2: Do you have MOQ requests?
A2: No. no MOQ requirement.
Q3: How do you make sure the quality?
A3: Our Product is all 100% tested including Flying Probe Test (for sample), E-test (mass) or AOI.
Q4: Can we visit your company?
A4: Of course! Welcome to visit our company, Grandtop is located in Hualun Tech Park, Shenzhen, Guandong province, china.
Q5: What is the lead time?
Q5: It takes 3-5 working days for sample, 7-10 working days for batch production based on files and quantity.
Q6: Will you keep our information and files secret?
A6: Sure! It is our basic principle to keep business secrets to protect our customers' rights and behalf.
Q7. How to work with you?
A7: -Email and send us the PCB layout file, BOM list
- We will provide reply confirmation within 12 hours and reply to the offer within 3-5 days.
- Waiting for your company to confirm the price, order and payment method.
- We will start the production.
Contact Us
Ruby Lee
Shenzhen Grandtop Electronics Electronics Co., Ltd
Audited Supplier 
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