|
Example of a
Pareto Chart
<Back to Page 1>
<Back to Page 2>
Table 1.
Example of a Tabulation of Causes of Ball Bond Lifting
for use in a
Pareto Chart
|
Ball Lifting Cause |
Frequency |
Percent (%) |
Cum Pct (%) |
|
Bonder
Set-up Issues |
19 |
38% |
38% |
|
Unetched
Glass on Bond Pad |
11 |
22% |
60% |
|
Foreign
Contam on Bond Pad |
9 |
18% |
78% |
|
Excessive Probe Damage |
3 |
6% |
84% |
|
Silicon
Dust on Bond Pad |
2 |
4% |
88% |
|
Corrosion |
1 |
2% |
90% |
|
Bond Pad
Peel-off |
1 |
2% |
92% |
|
Cratering |
1 |
2% |
94% |
|
Resin
Bleed-out |
1 |
2% |
96% |
|
Others |
2 |
4% |
100% |
|
Total |
50 |
100% |
- |
Figure 1.
The Pareto Chart Corresponding to Table 1
The Pareto
Chart in Figure 1 clearly shows that the greatest contributors to the
ball bond lifting problems of the engineer who undertook the data
collection are bonder set-up issues, unetched glass on bond pads, and
foreign contaminants on bond pads. Thus, the engineer has to focus on
these causes to reduce their ball lifting occurrences by as much as 78%.
<Back to Page 1>
<Back to Page 2>
See Also:
Ishikawa Diagram
HOME
Copyright
©
2004-2005
SiliconFarEast.com.
All Rights Reserved. |
