MIL-PRF-28750F
APPENDIX B
b.
The element metallization shall be acceptable if no failure occurs. If only one wire bond fails, a second
sample shall be selected from the remaining elements in the evaluation sample, and subjected to the test
B.3.3.3.3.3a. If the second sample contains no failures the bonding test results are acceptable. If the
second sample contains one or more failures, or if more than one failure occurs in the first sample, the
element lot shall be rejected.
c.
The element inspection lot may be resubmitted to evaluation if the failure was not due to defective element
metallization.
TABLE B-III. Assembled passive element evaluation requirements.
Quantity
Reference
Subgroup
Test
Method
Condition
(accept no.)
paragraph
1
Internal visual
2032
As
22 (0)
applicable
2
Electrical
10 (1)
3
Wire bond
2011
As
10(0) wires
evaluation
applicable
or
20(1) wires
B.3.3.4 Ceramic substrate printed wiring (substrates).
B.3.3.4.1 Definition. For the purpose of substrate evaluation, a substrate inspection lot shall consist of
homogeneous substrates having the same number of layers, manufactured using the same facilities, processes,
materials, and vacuum deposited, plated or printed as one lot.
B.3.3.4.2 Electrical test specifications. Electrical test parameters, values, limits and conditions shall be as
specified in the applicable substrate specification.
B.3.3.4.3 Evaluation of substrate element lots.
B.3.3.4.3.1 Electrical testing. Each substrate shall be electrically tested at 25C, as specified in the applicable
substrate detail specification.
B.3.3.4.3.2 Visual inspection. Each substrate shall be visually inspected to assure conformance with the
applicable requirements of MIL-STD-883, method 2032, and the applicable substrate detail specification.
B.3.3.4.4 Evaluation of assembled substrate elements. From each inspection lot of substrates, a randomly
selected sample shall be evaluated in accordance with table B-IV and B.3.3.4.4.1 through B.3.3.4.4.3. With preparing
activity approval, destructive tests may be performed on test coupons which provide the required test data. The test
coupons must be made with the same materials that were used in the manufacturing of the inspection lot and
processed at the same time as the inspection lot.
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