MIL-STD-1276H
TABLE IV. Cross reference of lead types - Continued.
Superseding type |
Discontinued type |
MIL-STD-1276D |
MIL-STD-1276C |
Composition |
Composition |
A B C D E F G H J K L M N W x |
Not available Not available C D Not available F G Not available Not available K C1 Not available N W x |
Underplating (same as revision C with the addition of C and P) |
|
Final finish |
Final finish |
01 21 22 31 32 33 34 51 52 61 71 72 |
1 2a 2b 3 4 Not available Not available 5a 5b 6 7 Not available |
6.6 Environmentally preferable material. Environmentally preferable material. Environmentally preferable materials should be used to the maximum extent possible to meet the requirements of this specification. As of the dating of this document, the U.S. Environmentally Protection Agency (EPA) is focusing efforts on reducing 31 priority chemicals. The list of chemicals and additional information is available on their website at https://www.epa.gov/osw/hazard/wastemin/priority.htm. Included in the list of 31 priority chemicals are cadmium, lead, and mercury. Use of the materials on the list should be minimized or eliminated unless needed to meet the requirements specified herein (see section 4).
6.7 Cleanliness. The last step in any component manufacturing process should be cleaning to remove residues such as fluxes.
6.8 Supersession data. Final finishes 31, 33, 35, and 36 are deleted, effective with revision E of this standard. These pure tin finishes may cause "tin whiskers" growth leading to shorts and intermittents, especially in low power (5 mA and below) applications. For additional information on this matter, refer to ASTM B545 ("Standard Specification for Electrodeposited Coating of Tin.") Replacement finish codes are 41, 43, 45, and 46 respectively, as described in
1.2.1.4, 5.2, and table V.
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