1. Wire tension (pull on bond) f = F/2sinα
Possible destructive test outcomes:
lift off 1
heel break 1
wire break
heel break 2
lift off 2 b1 b2
destructive test
measure max force F α f
Wire tension (pull on bond) f = F/2sinα

2. CERN PH-EP-Tech-Note-2011-002
In general, an acceptable quality in a standard bond pull test for a high reliability
physics experiment application would be:
no failure to make bonds during the bonding of the test wires (or less than 1% if 100 or more wires are made)
2) mean pull strength of >8 g and and RMS of <1 g
3) at least 75% heel breaks or mid-span breaks
Note that a “typical” good quality bonding surface would result in no failures in bonding (<<1%), a mean pull strength of g, an RMS of < 0.5 g, and > 95 % heel or mid-span breaks.

3. Oxford bus tape test
Pull Test Results
•Measured pull tests on samples with and without plasma cleaning.
•All tests good, i.e. break at heel.
•Much better than recommended QC by wire bonding group: Mean –5 sigma > 2.5 g
• No significant difference with plasma cleaning (differences less than 2 sigma).
With Without Plasma clean
Number of pulls
Mean (g)
RMS (g)
Mean-5 sigma (g)

4. Doesn’t bond at best settings for CICOREL
ELGOLINE
Bonder Parameters
Pull Test
Lot
Time
Power
Force
Sum Par
Mean
Std 2 35
100 20
155
4.17
1.56 3 10
145
10.98
0.55 4 16
151
6.49
1.37 5 24
159
3.5
0.84 6 25 80
129
10.55
0.78 7
121
11.28
0.58 8
131
11.33
0.28 9 85
136
7.62
1.33 95
154
4.1
1.08 11
144
5.99
1.01 12
134
9.5 13
126
11.85
0.85 14
130
10.38
0.96 15 90
135
9.21
1.28
140
7.87
1.58 17 30
6.09
2.21 18
7.43
2.34 19
10.1
1.54
Lot No.
Time
Power
Force b1
Force b2
Sum Par
Mean
Std
Mean scaled 2 30 90 16 18
137
7.8
1.09
6.32 3 95
142
6.22
2.06
5.04 4
100
147
3.92
0.65
3.18 5
105
152
4.68
1.51
3.79 6
110
157
3.75
0.71
3.04 7 85
132
8.94
1.95
7.24 8 35
7.36
2.75
5.96 9 40
8.19
1.89
6.63 10 50
7.68
1.4 11 60
162
7.72
1.99
6.25 12 65
167
6.82
2.86
5.52
Doesn’t bond at best settings for CICOREL
Mostly lift off 2
Mostly heel break 1

5. cicorel Mean force vs. Bond parameters:
Cicorel: low wire deformation  larger force
Elgoline: not much correlation  fail because of lift off (doesn’t depend on wire deformation)
cicorel

6. Cicorel
Elgoline