The Pareto Chart - Page 3 of 3

See Also:

The Pareto Chart (Page 3 of 3)

Table 1. Example of a Tabulation of Causes of Ball Bond Lifting

for use in a Pareto Chart

Ball Lifting Cause	Frequency	Percent (%)	Cum Percent (%)
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>

HOME