MIL-PRF-21038F
6.5 Subject term (key word listing).
Transformer
Pulse
MIL-STD-1553
6.6 Supersession of type designation. The type designation system used in previous revisions of MIL-PRF-
21038 was eliminated in this revision. The type designation system was not the PIN system but was a
classification system created to distinguish between various types of low-power pulse transformers. Since the
majority of low pulse power transformers in production currently are miniature, plastic case type devices there is
no longer a need for this classification system. The original type designation system covered a much wider
range of products which are older designs that are no longer covered under this specification. Revision E of this
specification streamlines the document to focus on requirements for miniature, low-power pulse transformers.
Revision D of this specification can be referred to for any drawings that reference the old type designation
system.
6.7 Magnet wire (see 3.3.5). It is recommended that ANSI/NEMA
W-1000 be considered for magnet wire.
6.8 Tin plated finishes. Tin plating is prohibited (see 3.3.4) since it may result in tin whisker growth. Tin
whisker growth could adversely affect the operation of electronic equipment systems. For additional information
on this matter, refer to ASTM B545 (Standard Specification for Electrodeposited Coating of Tin).
6.9 Changes from previous issue. Marginal notations are not use in this revision to identify changes with
respect to the previous issue due to the extensiveness of the changes.
6.10 Environmentally preferable material. Environmentally preferable materials should be used to the extent
possible to meet the requirements of this specification. Table V lists the Environmental Protection Agency
(EPA) top seventeen hazardous materials targeted for major usage reduction. Use of these materials should be
minimized or eliminated unless needed to meet the requirements specified herein (see section 3).
TABLE V. EPA top seventeen hazardous materials.
Benzene
Dichloromethane
Tetrachloroethylene
Cadmium and Compounds
Lead and Compounds
Toluene
Carbon Tetrachloride
Mercury and Compounds
1,1,1 - Trichloroethane
Chloroform
Methyl Ethyl Ketone
Trichloroethylene
Chromium and Compounds
Methyl Isobutyl Ketone
Xylenes
Cyanide and Compounds
Nickel and Compounds
12
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business