7-1焊点质量评定及IPC-A-610C（D）介绍.ppt

焊点质量评定及IPC-A-610C（D）介绍 8 Surface Mount Assemblies8.1 Staking Adhesive Target Condition - Class 1,2,3 8.2.1.1 Chip Components – BottomOnly Terminations, Side Overhang (A) Target Condition - Class 1,2,3 ? No side overhang. Acceptable - Class 1,2 ? Side overhang (A) is less than or equal to 50% width of component termination area (W) or 50% width of land (P), whichever is less. Acceptable - Class 3 ? Side overhang (A) is less than or equal to 25% width of component termination area (W) or 25% width of land (P), whichever is less. Defect - Class 1,2 ? Side overhang (A) is greater than 50% component termination width (W) or 50% land width (P), whichever is less. Defect - Class 3 ? Side overhang (A) is greater than 25% component termination width (W) or 25% land width (P), whichever is less. 8.2.1.2 Chip Components – BottomOnly Terminations, End Overhang (B) Defect - Class 1,2,3 ? End overhang (B) in Y axis is not permitted. 8.2.1.3 Chip Components – BottomOnly Terminations, End Joint Width (C) Target Condition - Class 1,2,3 ? End joint width (C) is equal to the width of the component termination (W) or width of land (P), whichever is less. Acceptable - Class 1,2 ? Minimum end joint width (C) is 50% width of component termination (W) or 50% width of land (P), whichever is less. Acceptable - Class 3 ? Minimum end joint width (C) is 75% width of component termination (W) or 75% width of land (P), whichever is less. Defect - Class 1,2 ? End joint width (C) is less than 50% width of component termination (W) or less than 50% width of land (P), whichever is less. Defect - Class 3 ? End joint width (C) is less than 75% width of component termination (W) or less than 75% width of land (P), whichever is less. 8.2.1.4 Chip Components – BottomOnly Terminations, Side Joint Length (D) Target Condition - Class 1,2,3 ? Side joint length (D) equals component termination length(L). Acceptable - Class 1,2,3 ? Any side joint length (D) is acceptable if all other solder requiremen