Soldering Circuit Boards Pcb
The advantages of PCB assembly are as follows:
1. Small size of electronic products
The volume of welded components is only about 1/10 of that of traditional cartridge components. Generally, after SMT SMT processing, the volume of electronic products can be reduced by 40%~60%.
2. Low efficiency and cost
PCB is easy to realize automation, improve production efficiency, save material, energy, equipment, manpower, time, reduce cost by 30%~50%.
3. Light weight
The weight of the SMT component is only 10% of that of the conventional cartridge, and the SMT can reduce the weight by 60%~80%.
4. High reliability and strong anti-vibration ability.
5, good high-frequency characteristics, reduce electromagnetic and rf interference.
6. Low defect rate of solder joints.
|Material||Laminate material||FR4, Alu, CEM3,Taconic,Rogers|
|Board cutting||Number of layers||1-58|
Min.Thickness for inner layers
(Cu thickness are excluded)
|Bow and twist||<7/1000|
|Copper weight||outer Cu weight||0.5-4 oz|
|inner Cu weight||0.5-3 oz|
|PTH hole tolerance||±0.002''(0.005mm)|
|NPTH Hole tolerance||±0.002''(0.005mm)|
|Plating||Min hole size||0.0008''（0.02mm）|
|Aspect ratio||20(5 :1)|
|Min solder mask clearance||0.003''(0.07mm)|
|E-test||Flying probe tester||Y|
|Impedance tester||Tektronix TDS8200|
|Surface finish||HASL,ENIG,immersion silver，immersion tin, OSP....|