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SMT贴片加工对PCB板的要求

2016-06-28

1.SMT贴片加工对PCB板大小及变形量:

  1. PCB宽度(含板边) 要大于等50mm;
  2. PCB长度(含板边) 要大于等50mm;
  3. 板边宽度:>5mm;
  4. 拼板间距:<8mm;
  5. PAD与板缘距离:>5mm;
  6. 向上弯曲程度:<1.2mm;
  7. 向下弯曲程度:<0.5mm;
  8. PCB扭曲度:最大变形高度÷对角长度<0.25

2.SMT贴片加工对PCB板上识别点(Mark)的要求:

  1. Mark的形状:标准圆形、正方形、三角形;
  2. Mark的大小;0.8~1.5mm;
  3. Mark的材质:镀金、镀锡、铜铂;
  4. Mark的表面要求:表面平整、光滑、无氧化、无污物;
  5. Mark的周围要求:周围1mm内不能有绿油或其它障碍物,与Mark颜色有明显差异;
  6. Mark的位置:距离板边3mm以上,周围5mm内不能有类似Mark的过孔、测试点等;
  7. 为避免生产时进板方向错误,PCB左右两边Mark与板缘的位置差别应在10mm以上。

 

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