|Place of Origin:||China|
|Brand Name:||WITGAIN PCB|
|Minimum Order Quantity:||Negotiable|
|Packaging Details:||20pcs/bag, 10bags/carton|
|Delivery Time:||15 work days|
|PCB Type:||Heavy Copper PCB||Layer Count:||8 Layer|
|Copper Thickness:||5/2/2/2/2/2/2/5OZ||Board Thickness:||2.2MM|
|Solder Mask:||Green||Application:||Frequency Power Supply|
2.2MM Thick Copper PCB,
Thick Copper PCB,
0.45MM Hole Thick Copper PCB
8 Layer Printed Circuit Board
Layer Count: 8 Layer PCB
Material: FR4, TG170 TU768 tu-768_datasheet.pdf
Board Thickness: 2.2MM
Min Hole: 0.45MM
Hole Stucture: L1-L8
Min Trace: 10/8Mil
Solder Mas: Green
Unit Size: 180MM*96MM/1pcs
Surface Treatment: ENIG
Application: Frequency Power Supply
|1||Layer Count||1-24 Layers|
|3||Finished Board Max Size||700mm*800mm|
|4||Finished Board Thickness Tolerance||+/-10% +/-0.1(<1.0mm)|
|6||Major CCL Brand||KB/NanYa/ITEQ/ShengYi/Rogers Etc|
|7||Material Type||FR4,CEM-1,CEM-3,Aluminum,Copper, Ceramic, PI, PET|
|8||Drill Hole Diameter||0.1mm-6.5mm|
|9||Out Layer Copper Thickness||1/2OZ-8OZ|
|10||Inner Layer Copper Thickness||1/3OZ-6OZ|
|12||PTH Hole Tolerance||+/-3mil|
|13||NPTH Hole Tolerance||+/-1mil|
|14||Copper Thickness of PTH Wall||>10mil(25um)|
|15||Line Width And Space||2/2mil|
|16||Min Solder Mask Bridge||2.5mil|
|17||Solder Mask Alignment Tolerance||+/-2mil|
|19||Max Gold Thickness||200u'(0.2mil)|
|20||Thermal Shock||288℃, 10s, 3 times|
|22||Test Capability||PAD Size min 0.1mm|
|24||Surface Treatment||OSP, ENIG,HASL, Plating Gold, Carbon Oil,Peelable Mask etc|
Question: What are Heavy Copper PCBs?
Answer: PCBs carry current through the copper tracks etched on them. The current carrying capacity of a copper track can be enhanced by increasing the width of the copper tracks, but this is not always feasible. Another way to increase the current-carrying capacity without changing the width of the copper traces is to use ‘Heavy Copper PCBs’ that carry more current and improve efficiency with better heat management.
Although, there are no defined rules that specify the amount of copper to use when fabricating heavy copper PCBs. The PCB industry follows a rule, which says, three or more ounces of copper on any PCB layer classifies as a ‘Heavy Copper PCB’. We have seen instances where there are up to 8 oz used for the inner layers of a PCB and up to 40 oz used on the outer layers of the PCB.
Characteristics of Heavy Copper PCBs
Design Consideration for Heavy Copper PCBs
First of all, the designers decide the current values they need a track to carry. They can then design the PCB and the copper tracks by carefully selecting the copper thickness and width. The amount of heat a heavy copper PCB generates is closely related to the amount of current it carries. So the operation temperature can also be estimated.
When current passes through the copper track, its resistance causes it to be hot. The main idea is to transit this heat into the environment through conduction and convection. Here, a designer’s job is to calculate the amount of current a track will carry before the temperature reaches around 30°C. It is worth noticing that the inner PCB layers can bear only about 50% of the current as compared to the outer layers. The Glass transition temperatures (Tg) of the copper and substrate material is also important, as a high current may cause cracks and layer separation.
Board surface thickness can be increased through additive plating, say electroplating. It reduces the resistance of copper traces by improving the heat conduction. Electroplating is also used by fabricators for PTHs to reduce their thermal resistance. Resistance reduction helps to dissipate heat efficiently through conduction, convection, and radiation phenomenon.
Heavy Copper Fabrication Methods
Manufacturing Limitations of Heavy Copper PCBs: Fabrication of thick copper PCBs has some limitations:
Applications of Heavy Copper PCBs
Heavy Copper PCBs find applications in the military (weapon control systems, power supply for RADAR systems, windings of high-power plant transformers, battery chargers & monitoring systems), power amplifier modules, DC-to-DC power converters, heat dissipation products, automotive power distribution junction boxes, high power distribution boards, and others that require high currents.
Contact Person: Steven