MIL-PRF-28750F
APPENDIX B
B.3.4 Control of critical process and procedure (process control). The indicated process shall be controlled in
TABLE B-V. Process control summary.
Paragraph
Operation
Method
Condition
Wire bonding
2011
As applicable
2023
B.3.4.1 Wire bonding.
B.3.4.1.1 General. A process machine/operator evaluation shall be performed:
a.
When a machine is put into operation.
b.
Periodically while in operation, not to exceed 4 hours.
c.
When the operator is changed.
d.
When any machine part or an adjustment has been made.
e.
When the spool of wire is changed or a new SSR production lot is started.
B.3.4.1.2 Test samples. Test samples that simulate the production SSR may be destructively evaluated in lieu of
the product.
B.3.4.1.3 Process machines. Process machines not meeting the evaluation requirements shall not be used.
B.3.4.1.4 Corrective action of process machine. A process machine may be returned to operation only after
appropriate corrective action has been implemented and the machine has been evaluated and passed testing in
accordance with table B-V as required.
B.3.4.1.5 Data record. A data record shall be maintained and identifiable to each machine, operator, shift, and
date of test.
B.3.4.1.6 Wire bonding. Wire bond strength testing shall be performed as follows.
B.3.4.1.6.1 Process machine/operator evaluation. A minimum sample of 10 wires total from 3 SSR's shall be
destructively pull tested in accordance with MIL-STD-883, method 2011.
a.
The sample shall consist of bonds to elements typical of SSR assembly operation.
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