China Circuit Board
#1
PCB Knowledge:
All surface attachment connectors must be provided with some form of stress relief. Some connector companies use screws to lock circuit boards or accessories to panels for stress relief. While these concepts may increase mechanical strength, some solutions can provide necessary and reliable circuit board support without even secondary assembly or manual negotiation. 
Through-hole reflux technology requires some form of stress relief for all surface attachment connectors. Some connector companies use screws to lock circuit boards or accessories to panels for stress relief. While these concepts may increase mechanical strength, some solutions can provide necessary and reliable circuit board support without even secondary assembly or manual negotiation. 
Through-hole reflow technology enables surface-mount connectors to be connected through a discharger and provides more robust circuit board connections than surface-mount technology. Similar to the through pin, either the through hole reflow welding or the pin solder paste requires that the fine hole be partially drilled into the PCB, so that these fine needles can be soldered through the reflow. These through pins are used in conjunction with surface-mount signal pins, and these are often supplied with double loads through enhanced mechanical strength and grounding. However, when the through-hole reflux pin is applied to high-speed applications, there will be some disadvantages. 
While surface pins are used for signal performance, through-hole reflow pins provide stronger connections on the circuit board. Moreover, with the continuous increase in the height of the interlayer connector and the weight of the sub-card, the through-hole reflow needle undoubtedly provides more outstanding stiffness and strength. As a practical standard for backboard connectors over the past 40 years, surface mount / through hole backboard solutions tend to outperform the signal performance of pressure-bonding and provide excellent durability at the same time. If the execution is correct, t the surfacing technology is suitable for any application.(Printed Circuit Board Manufacturers) 
Process of pcb manufacturing: 
PCB Capability: 
Max layers number: 40  layers 
Min line width/gap: 3mil/3mil 
Min hole size for mechanical drill: 0.15mm 
Min hole size for laser drill: 0.1mm 
Min annular ring: 4 mil 
Max copper thickness: 12oz 
Max size for single and double layers PCBs: 600 x 1200mm 
Max size for multi-layers PCBs: 500 x 1200mm 
Board thickness for 2 layers: 0.2-8.0mm 
Board thickness for multi-layers: 0.4-8.0mm 
Min solder mask bridge: 0.08mm 
Aspect raion: 15:1 
Plugging vias capability: 0.2-0.8mm 
Impedance Control Tolerance: ±10%(±5% for PCB Prototypes) 
Thickness tolerance for PTH: +/- 3mil 
Thickness tolerance for NPTH: +/- 2mil 
Solder mask color: White, black, blue, green, yellow, red and so on 
Character: White,yellow,black. 
Finished surface: OSP(Entek), HASL no lead free, HASLLead Free,ENIG(Immersion Gold), Immersion Tin, Immersion Silver, Hard Gold, Platting Gold, Gold Finger, Enepig. 
Month capability: 6000 types/month, 
30000 square meters/month 
Normal board materials: SHENGYI,ITEQ,KB. 
Special materials: ROGERS, ARLON,TACONIC,NELCO,ISOLA, HighTG:S1000-2.IT180 
PCB Equipment: 
Certifications: 
Our Company is UL,ISO9001,ROHS and GJB9001B certified.  
Packing and Shipping:
FAQ: 
1. How to Get a quotation? 
For PCBs,pls send us the Gerber File.For PCBA,pls send us the Gerber file and BOM(Bill of Materials) 
2. What is the MOQ? 
No MOQ.1 pcs is ok. 
3.What is the lead time? 
For PCB orders,the lead time is 2 to 10 days.For PCBA orders,the lead time will be 15 to 30 days. 
4.Will the boards be tested before shippment? 
Yes,all PCBs will be tested by Flying Probe or E-test.For PCBA,we will have AOI,X-ray,and functional test 
  China Circuit Board
website:http://www.linkepcb.com/circuit-board/


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