S Pyatt Cicorel optimised welding parameters. S Pyatt 30 degree loop parameters.

S Pyatt

Cicorel optimised welding parameters

S Pyatt

30 degree loop parameters

S Pyatt

BJ820 bond chart for Cicorel board

S Pyatt

BJ820 bond chart for Loctite 3525 die to sub

Work in progress

S Pyatt

BJ820 bond chart for Loctite 3525 die to die

Work in progress

S Pyatt

BJ820 bond chart for Dymax 6 621 die to sub

S Pyatt

BJ820 bond chart for Dymax 6 621 die to die

S Pyatt

BJ820 bond chart for Dymax 3013 die to sub

S Pyatt

BJ820 bond chart for Dymax 3013 die to die

S Pyatt

BJ820 bond chart for Dymax 3013 die to sub

S Pyatt

BJ820 bond chart for TRA DUCT die to die

S Pyatt

BJ820 bond chart for TRA DUCT die to sub

Work in progress

S Pyatt

Pull test results Loctite 3525 die to die

Work in progress

S Pyatt

Pull test results Dymax 6 621 die to die

1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 790

2

4

6

8

10

12

Pull test number

Gram

s

First heel break

Second heel break

First heel peel Second heel peel

05

1015202530354045

Freq

uenc

y

Average g: 9.470557Std Dev g: 0.440693

Fail type FrequencyFirst heel break 37

Second heel break 42First heel peel 0

Second heel peel 0

S Pyatt

Pull test results Dymax 3013 die to die

1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 798

8.2

8.4

8.6

8.8

9

9.2

9.4

9.6

9.8

10

10.2

10.4

Pull test number

Gram

s

Average g: 9.310747Std Dev g: 0.481358

Fail type FrequencyFirst heel break 79

Second heel break 0First heel peel 0

Second heel peel 0First heel

breakSecond heel

breakFirst heel peel Second heel

peel

0102030405060708090

Freq

uenc

y

S Pyatt

Pull test results TRA DUCT die to die

1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 79 820

2

4

6

8

10

12

Pull test number

Gram

s

First heel break

Second heel break

First heel peel Second heel peel

0102030405060708090

Freq

uenc

y

Average g: 8.99628Std Dev g: 0.488235

Fail type FrequencyFirst heel break 82

Second heel break 0First heel peel 0

Second heel peel 0

S Pyatt

Pull test results Loctite 3525 die to substrate

Work in progress

S Pyatt

Pull test results Dymax 6 621 die to substrate

1 2 3 4 5 6 7 8 9 1011121314151617181920212223242526272829303132333435363738394041424344454647484950510

2

4

6

8

10

12

14

16

Pull test number

Gram

s

First heel break

Second heel break

First heel peel Second heel peel

0

5

10

15

20

25

30

Freq

uenc

y

Average g: 10.88151Std Dev g: 1.444102

Fail type FrequencyFirst heel break 14

Second heel break 13First heel peel 0

Second heel peel 24

S Pyatt

Pull test results Dymax 3013 die to substrate

1 2 3 4 5 6 7 8 9 1011121314151617181920212223242526272829303132333435363738394041424344454647484950510

2

4

6

8

10

12

14

16

Pull test number

Gram

s

First heel break

Second heel break

First heel peel Second heel peel

0

5

10

15

20

25

30

Freq

uenc

y

Average g: 10.6189Std Dev g: 1.301571

Fail type FrequencyFirst heel break 18

Second heel break 6First heel peel 0

Second heel peel 27

S Pyatt

Pull test results TRA DUCT die to substrate

Work in progress

S Pyatt

Why is there are difference? Pull angles!

S Pyatt

Maths goes h

ere

S Pyatt

The peels are actually vertical tears

Completed weld marks

S Pyatt

Meanwhile on the dies

No peels. All heel breaks.

S Pyatt

Conclusions

• All three UV glues are suitable for wire bonding on the Hesse BJ820.

• Pull testing for die to die wires gives the correct results.

• Pull testing for die to substrate wires gives false results due to incorrect pull angles. The process is not suitable for production work.