Most thick copper plates are high-current substrates. The main application areas of high-current substrates are two major areas: power modules and automotive electronic components.
High-current substrates differ from traditional PCBs in working efficacy. The major function of a traditional PCB is to use wires that transmit signals. In contrast, the high-current substrate has a big current passing through it. The priority is to protect the current loading capacity and smooth the power current. The research and development trend of such high-current substrates is to bear larger currents. The currents passing through are getting larger and larger to dissipate more and more heat generated by the high power/voltage circuits, and all the copper foils on the substrates are getting thicker and thicker. The 6oz copper thickness substrates manufactured now have become regular; With the rapid increase in the share of electric vehicles, thick copper PCBs have also ushered in a rapid growth cycle.
Etching
As the copper thickness increases due to the increasing difficulty of potion exchange, the amount of lateral erosion will become larger and larger. Multiple times are required to reduce the large amount of lateral erosion caused by potion exchange as much as possible. The fast etching method solves the problem. As the amount of side etching increases, it is necessary to compensate for the side etching by increasing the etching compensation coefficient.
Lamination
With the increase in copper thickness, the line gap is deeper. Under the same residual copper rate, the required amount of resin filling needs to increase. It is necessary to use multiple prepregs to meet the problem of filling; due to the need to use resin to maximize. The prepreg with high glue content and good resin fluidity is the first choice for thick copper PCBs.
The commonly used prepregs are 1080 and 106. When designing the inner layer, place copper points and copper blocks in the copper-free area or the final milled area to increase the residual copper rate and reduce the pressure of the glue filling. The increase in the use of prepreg will increase the risk of sliding, and adding rivets is a valid method of strengthening the degree of fixation between the core boards. Under the trend of increasing copper thickness, the resin is also used to fill the blank area between graphics.
Therefore, in PCB manufacturing, choosing a board with fillers, low CTE, and high Td is the basis for ensuring the quality of thick copper PCBs. As the copper is thicker than the board, more heat is required for lamination. Longer temperature conductive times are required, and insufficient duration of high temperature can result in insufficient resin curing of the prepreg. That will lead to a reliability risk for the circuit board; therefore, increasing the duration of the high-temperature section of lamination is highly desirable to ensure the curing effect of the prepreg. If the prepreg is insufficiently cured, the amount of glue removed from the prepreg relative to the core board is large, forming a stepped shape, and then the hole copper is broken due to the action of stress.
Drilling
Thick copper PCBs are usually more than 2.0mm thick. Due to thicker copper thickness during drilling, it is more difficult to make. Segmented drilling has become an effective solution for drilling thick copper plates. In addition, the optimization of drilling-related parameters such as feed speed and retract speed also greatly impacts the quality of the hole. For the problem of milling target holes, when drilling, the X-RAY energy gradually decays with the increase of copper thickness, and its penetration ability will reach the upper limit, making confirming the first board very difficult. The offset confirmation target can be set at different positions on the board’s edge as a backup solution. The offset confirmation target line can be milled out on the copper foil according to the target position when the material is cut. Layer target holes correspond to production. The problem of inner layer thick copper pads (mainly for large holes above 2.5mm) requires thick copper plates, and the inner layer pads are getting smaller and smaller, and the problem of pad cracking during PCB drilling often occurs. There is little room for improvement in such problematic materials. The traditional improvement method is to increase the pad, increase the peel strength of the material, and reduce the drop speed of the drilling hole. From the PCB processing design and process analysis, an improvement plan is proposed: copper extraction (that is, when the pad is etched on the inner layer, the concentric circles smaller than the aperture are etched away) to reduce the pulling force of the drilled copper. Drilling first drills a pilot hole 1.0mm smaller than the hole diameter and then performs normal drilling (that is, perform secondary drilling) to solve the inner layer thick copper pad cracking.
1. PCB fabrication.
2. Turnkey PCBA: PCB+components sourcing+SMD and through-hole assembly
3. PCB clone, PCB reverse engineering.
PCB or PCBA Files Requests:
1. Gerber files of the bare PCB board
2. BOM (Bill of material) for assembly (please kindly advise us if there is any acceptablecomponents substitution.)
3. Testing Guide & Test Fixtures if necessary
4. Programming files & Programming tool if necessary
5. Schematic if necessary
Global Well Electronic Inc. is a professional PCB solution supplier from Shenzhen, China, integrating PCB circuit board production and processing, STM processing and mounting, PCBA OEM, component purchasing, PCB/PCBA custom design-production- A comprehensive PCB circuit board company with one-stop turnkey service of processing-assembly-finished products. The company has a strong supply chain system, a professional and efficient collaborative team, a sound and complete quality control system, and the business philosophy of honesty and trustworthiness, customer first, and presents the products to everyone with low prices, reliable quality, high-quality service and after-sales service. client.
We provide total PCB solutions from PCB design to final mass production, including PCB fabrication and assembly, component sourcing, solder paste stencils, conformal coatings, and more. Serving the global electronics field, including industrial control, medical electronics, military equipment, power communication, automotive electronics, AI artificial intelligence, smart home and other industries.
Our factory located in Shenzhen, and have almost 300 employees, more than 30 production lines include SMT, DIP, automatic welding, aging test and assembly. We have SMT machines from Japan and Korea, automatic solder paste printing machines, solder paste inspection machine(SPI)12 temperature zone reflow soldering machine, AOI detector, X-RAY detector, wave soldering machine, EM PCB ,dispenser,laser print machine etc., Different line configurations can meet requirements from small sample order to bulk shipment.
Our company has obtained ISO 9001 quality system certification and ISO 14001 system certification. With multi-testingprocedures, our products carry out the quality system standard strictly.
| Order Quantity | 1-300,000,30000 Square Meter/Square Meters per Month module electronic board |
| Layer | 1,2,4,6,upto 40 layer |
| Material | FR-4,glass epoxy,FR4 High Tg,Rohs compliant,Aluminum,Rogers,etc |
| PCB type | Rigid,flexible,rigid-flexible |
| Shape | Any shape: Rectangular,round,slots,cutouts,complex,irregular |
| Max PCB dimensions | 20inch*20inch or 500mm*500mm |
| Thickness | 0.2~4.0mm, Flex 0.01~0.25'' |
| Thickness tolerance | ± 10% |
| Copper thickness | 0.5-4 oz |
| Copper thickness tolerance | ± 0.25oz |
| Surface finish | HASL,Nickle,Imm Gold,Imm Tin,Imm Silver,OSP etc |
| Solder mask | Green, red,white,yellow,blue,black, Double-sided |
| Silk screen | White,yellow,black,or negative, Double-sided or single-sided |
| Silk screen min line width | 0.006'' or 0.15mm |
| Min drill hole diameter | 0.01'',0.25mm.or 10 mil |
| Min trace/gap | 0.075mm or 3mil |
| PCB cutting | Shear,V-score,tab-routed |
| Turnkey PCBA | PCB+components sourcing+assembly+package |
| Assembly details | SMT and Thru-hole, ISO lines |
| Lead Time | Prototype: 15 work days. Mass order: 20~25 work days |
| Testing on products | Flying Probe Test, X-ray Inspection, AOI Test, functional test |
| Quantity | Min quantity: 1pcs. Prototype, small order, mass order, all OK |
| Files we need | PCB: Gerber files(CAM, PCB, PCBDOC) |
| Components: Bill of Materials(BOM list) | |
| Assembly: Pick-N-Place file | |
| PCB panel Size | Min size: 0.25*0.25 inches(6*6mm) |
| Max size: 20*20 inches(500*500mm) | |
| PCB Solder Type | Water Soluble Solder Paste, RoHS lead free |
| Components details | Passive Down to 0201 size |
| BGA and VFBGA | |
| Leadless Chip Carriers/CSP | |
| Double-sided SMT Assembly | |
| Fine Pitch to 0.8mils | |
| BGA Repair and Reball | |
| Part Removal and Replacement | |
| Component package | Cut Tape,Tube,Reels,Loose Parts |
| PCBA process |
Drilling-----Exposure-----Plating-----Etaching Stripping-----Punching-----Electrical Testing-----SMT-----Wave Soldering-----Assembling-----ICT-----Function Testing-----Temperature - Humidity Testing |
Packing details:
PCBA are packed into plastic bags. Plastic bags are put into small carton. 4 small carton into a big carton.
A big carton: 35×32×40 cm size.
Shipping Express:
FedEx, DHL, UPS, TNT, EMS, private lines, etc.
Air freight, Sea shipping
If you need help on PCB layout, you can contact us and send the board to us. We also provide Reverse Engineering Service.
We have been providing PCB Manufacture for many years in China,and we have rich experience in product production and product assembly.We believe our team will provide high quality and low cost service for you.
Thank you very much for all your support .
Best Regareds.
Q:What is needed for PCB/PCBA quotation?
A: For Bare PCB project quotation:
Please provide Quantity, Gerber file and specification include PCB material,Size, surface finish treatment, copper thickness,
board thickness, soldermask color and silkscreen color ,HASL or HASL-LF and other special specs.
For PCBA project quotation:
Please provide above information as well, and BOM list.If you need turnkey service include programming and functional testing etc, kindly contact us for more details.
Q:Are my design files secure when I send them to you?
A:We warranty that Your files are never shared nor will any third parties have access to your design files. We can accept sign an NDA(Non-disclosure agreement) before sending files.
Q.May I have a sample for testing ?
A:We can supply the sample if we have ready parts in stock,we also can accoring to custom demand to design the PCBA samples to test first before big order .
Q:Are you factory or Trading company?
A: We are a factory with PCB maufacture and SMT assembly factory in China .
Q:Do you have an minimum order quantity?
A:We accept sample order with as low as a quantity of 1 (piece or panel) before bigger order.
Q. How about your delivery time?
A: Generally, goods would be shipped in 7-10 working days after payment received, finally depends on order quantities.
Q:what's the Payment way?
A:TT ,Western Union, Alibaba online payment
Q. Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery
Q: Can I customized for product?
A: Yes, we support OEM ODM
Q.What is your warranty ?
A : Within 60 days after package have been received .
Q.What is your terms of payment ?
A : Full Payment before send goods out.
Q: How to send the goods?
A: Small QTY: ship by express included in DHL, FedEx UPS and TNT. Door to door.
Large QTY: Ship by sea, or by air.
