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

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 10-12 g, an RMS of < 0.5 g, and > 95 % heel or mid-span breaks.

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 37 44 Mean (g) 10.02 10.35 RMS (g) 0.88 1.03 Mean-5 sigma (g) 5.64 5.20

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

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

Cicorel Elgoline