MIL-PRF-38535K
APPENDIX A
TABLE A-III. Coating thickness and composition requirements.
Thickness
(microinch/micrometer)
Coating
Coating composition requirements
Minimum 1/
Maximum 2/
Hot solder dip (for all
round leads) 3/
60/1.52
NS
The solder bath shall have a nominal composition
of Sn60 or Sn63.
Hot solder dip (for all
shapes other than round
leads which have ≤ 25 mil
pitch) 3/
150/3.80
200/5.08
300/7.62
NS
NS
NS
The solder bath shall have a nominal composition
of Sn60 or Sn63.
The solder bath shall have a nominal composition
of Sn60 or Sn63.
Hot solder dip (for all
shapes other than round
leads with > 25 mil pitch)
3/
Shall consist of 3 to 50 percent by weight lead
(balance nominally tin) homogeneously co-
deposited. Shall contain no more than 0.05
percent by weight co-deposited organic material
measured as elemental carbon. 5/
Tin-lead plate (as plated)
4/
200/5.08
50/1.27
NS
Tin-lead plate (fused) 4/
Gold plate
225/5.72
Shall contain a minimum of 99.7 percent gold.
Only cobalt shall be used as the hardener.
50/1.27
50/1.27
350/8.89
250/6.35
The introduction of organic addition agents to
nickel bath is prohibited. Up to 40 percent by
weight cobalt is permitted as a co-deposit.
Nickel plate (electroplate)
Nickel plate (electroless)
The introduction of organic additive agents to
nickel bath is prohibited.
50/1.27
20/0.51
20/0.51
350/8.89
84/2.13
84/2.13
Nickel cladding
Palladium
Gold flash palladium
1/ Package elements having noncompliant coatings are permitted provided they are subsequently hot solder dipped
in accordance with A.3.5.6.3.4b.
2/ NS = Not specified.
3/ See A.3.5.6.3.4.
4/ See A.3.5.6.3.5.
5/ The maximum carbon content (and minimum lead content in tin-lead plate) shall be determined by the
manufacturer on at least a weekly basis. The determination of carbon and lead content may be made by any
accepted analytical technique (e.g., for carbon: pyrolysis, infrared detection (using an IR212, IR244 infrared
detector, or equivalent); for lead: X-ray fluorescence, emission spectroscopy) so long as the assay reflects the
actual content in the deposited finish.
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ACTEL [ Actel Corporation ]
