An Investigation Into Ball Grid Array Inspection Techniques

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~esa STM-26I Editor: Copyright: Published by: 11 ISBN: Price: Michael Perry @ 1999 European Space Agency ESA Publications Division 92-9092-338-5 € 16,00
Abstract An evaluation of four different X-ray inspection systems has been undertaken. Two perpendicular transmission X-ray systems, an angled X-ray transmission system and an automatic X-ray laminography system were evaluated. The samples inspected were assembled ball grid array (BGA) components with known defects. The defects included misalignments, missing balls, bridges, non-wetted pads and partially reflowed solder joints. The presence of these defects was confirmed after X-ray inspection by metallographic examination. All the X-ray systems evaluated were found capable of identifying misalignments, bridges and missing balls. Only the angled transmission X-ray system was completely successful at finding the non-wetted pads. The efficiency of locating non-wetted pads using perpendicular transmission X-ray systems may be improved by altering the substrate pad shape from round to tear-drop. Similarly the laminography system efficiency may be improved by taking advantage of such a pad design. 111 Ball Grid Array Inspection Techniques
Page 1: An Investigation Into Ball Grid Arr
Page 7 and 8: 1 Introduction X-ray techniques hav
Page 9 and 10: X-rays and displays them as an imag
Page 11 and 12: Each defect was identified using th
Page 13 and 14: 2.3 BGA PCB Image Summary of defect
Page 15 and 16: Sample 4 Misaligned component 2.4 U
Page 17 and 18: 4. Equipment Evaluated Four machine
Page 19 and 20: 'If ~ c.S"'
Page 21 and 22: 5. Results This section is structur
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Page 25 and 26: 19 Ball Grid Array Inspection Techn
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Page 29 and 30: 5.3 Results For Sample 2 The defect
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Page 39 and 40: 5.5 Results For Sample 3 The defect
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Page 47 and 48: The laminography system also behave
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Page 53 and 54:
51 Ball Grid Array Inspection Techn
Page 55 and 56:
5.11. Identification of voids withi
Page 57 and 58:
Table 1: Defect Detectability and L
Page 59 and 60:
7. Recommendations The most sensiti
Page 61 and 62:
9. References 1. ESA PSS 01-708 The
Page 63:
~esa STM-261 Editor: Copyright: Pub
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