MIL-PRF-23648F
4.6.2.2 Subgroup 2 (solderability). A sample of parts from each inspection lot shall be selected
randomly in accordance with table VI and subjected to the subgroup 2 solderability test. The
manufacturer may use electrical rejects from subgroup 1 screening tests for all or part of the samples to
be used for solderability testing. If there are one or more defects, the lot shall be considered to have
failed.
a. Each production lot that was used to form the failed inspection lot shall be individually submitted to
the solderability test as required in 4.8.4. Production lots that pass the solderability test are
available for shipment. Production lots failing the solderability test can be reworked only if
submitted to the solder dip procedure in 4.6.2.2b.
b. The manufacturer submits the failed lot to a 100 percent solder dip using an approved solder dip
process in accordance with 3.3.1.3. Following the solder dip, the electrical measurements
required in group A, subgroup 1 tests shall be repeated on 100 percent of the lot. Lot acceptance
criteria shall be as for subgroup 1. Additional samples shall be selected in accordance with table
VI and subjected to the solderability test with zero defects allowed. If the lot fails this solderability
test, the lot may be reworked a second time and retested. If the lot fails the second rework, the lot
shall be considered rejected and shall not be furnished against the requirements of the
specification.
TABLE V. Group A Inspection.
Inspection
Requirement
Method
Sampling
paragraph
paragraph
procedure
Subgroup 1
Visual and mechanical examination
Body dimensions
Diameter and length of leads
4.6.2.1
Marking 1/
Workmanship
Zero power resistance
Resistance ratio characteristic
Subgroup 2 2/
Solderability
4.6.2.2
1/ Marking defects shall be charged only for illegible or incomplete marking. Any subsequent electrical
defect shall not be charged as a marking defect.
2/ The manufacturer may request the deletion of the subgroup 2 solderability test, providing an in line
process control system for assessing the solderability of leads can be validated and approved by the
qualifying activity. Deletion of the test does not relieve the manufacturer from meeting this test
requirement in case of dispute. If the design, material, construction, or processing of the part is
changed or if there are any problems, the qualifying activity may require resumption of the test.
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