MIL-STD-1276H
TA8LE II. Preferred methods of assembly - Continued. 1/ , 2/
|
Composition (see 5.1) |
Underplating (see 5.2.1) |
Final finish (see 5.2) |
|||||||||||
|
01 |
21 |
22 |
32 |
34 |
41 |
43 |
51 |
52 |
61 |
71 |
72 |
||
N " " " " W " " " " X |
C P N A 8 P N |
--- --- W --- --- --- --- |
--- --- --- S,W S,W --- --- |
--- --- --- S,W S,W --- --- |
S " " " " " " " " " |
S " " " " " " " " " |
S " " " " " " " " " |
S " " " " " " " " " |
S " " " " " " " " " |
S " " " " " " " " " |
W " " " " " " " " " |
S " " " " " " " " " |
S " " " " " " " " " |
|
As specified in the acquisition document. |
|||||||||||||
1/ S = Solder.
2/ W = Weld.
4.2 Solderability. When specified in the acquisition documents, leads shall meet the following solderability requirements.
a. Discrete semiconductor devices: Test method 2026 of MIL-STD-750. b. Microelectronics: Test method 2003 of MIL-STD-883.
c. Other electronic and electrical component parts: Test method 208 of MIL-STD-202.
4.3 Thickness. When specified in the acquisition document, the thickness of the final finish and underplating shall be determined in accordance with ASTM 8487 or ASTM 8567.
4.4 Adhesion. When specified in the acquisition document, the adhesion of the final finish and underplating shall be determined in accordance with ASTM 8571 or method 2025 of MIL-STD-883.
4.5 Porosity. When specified in the acquisition document, there shall be no evidence of porosity for final finishes
21, 22, and 61 when tested in accordance with ASTM 8735 or ASTM 8741.
4.6 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs.
4.7 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin content of leads and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.6).
4.8 Workmanship in finishes. All plating or primary finishes or underplating shall be deposited in such a way that the plating is applied to a clean, nonoxidized metal surface that is free from defects that will be detrimental to the utility, form, fit, function, or protective value of the finish. Where surface cleaning, deoxidation, activation, or undercoating are used, the material or device so treated must proceed immediately to the primary finish process in order to maintain the ability to overplate effectively.
7
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business