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MIL-PRF-27 Transformers And Inductors \(Audio, Power, And High-Power Pulse\), General Specification ForThis specification covers the general requirements for power transformers, power inductors, audio transformers, audio inductors, high power pulse transformers, charging inductors, saturable transformers and saturable inductors for use in electronic and communication equipment. This specification covers transformers and inductors weighing 300 pounds or less or having root-mean-square \(rms\) test-voltage ratings 0f 50,000 volts or less, and also high-power pulse transformers where the peak pulse power is greater than 5 watts. Transformer and inductor assemblies incorporating any other active or passive components do not come within the scope of this specification.

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MIL-PRF-27G
1.2.3.2 Grade 5. Grade 5 units are encapsulated, including molded or embedded constructions, and units with a
metal shell, open at one or both ends and filled with encapsulant material.
1.2.3.3  Grade 6. Grade 6 units are open type and are generally intended for subsequent potting, molding, or
embedment in an assembly with or without component parts.
TABLE I. Grade.
Test
Grade 4
Grade 5
Grade 6
metal encased
encapsulated
open type
Seal - - - - - - - - - - - - - - -
X
---
---
Thermal shock - - - - - - - -
X
X
X
Immersion - - - - - - - - - - -
X
X
---
Moisture resistance - - - -
X
X
---
Vibration - - - - - - - - - - - -
X
X
X
Shock - - - - - - - - - - - - - -
X
X
X
Flammability - - - - - - - - -
---
X
---
Salt Atmosphere (when
specified) - - - - - - - - - - - -
X
X
---
1.2.4 Class. The class is identified by a single letter in accordance with table II, and denotes the maximum
operating temperature (temperature rise (see 4.7.13) plus maximum ambient temperature (see 6.10.2.3).
TABLE II. Class.
Symbol
Maximum operating temperature
°C
Q
85
R
105
S
130
V
155
T
170
U
170, as specified (see 3.1)
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This
section does not include documents cited in other sections of this specification or recommended for additional
information or as examples. While every effort has been made to ensure completeness of this list, document users are
cautioned that they must meet all specified requirement documents cited in section 3 and 4 of this specification,
whether or not they are listed.
2.2 Government documents.
2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a
part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are
those listed cited in the solicitation or contract.
DEPARTMENT OF DEFENSE SPECIFICATIONS
(See supplement 1 for a list of specification sheets.)
FEDERAL STANDARDS
FED-STD-H28
- Screw-Thread Standards for Federal Services.
FED-STD-595/26307
- Gray, Semigloss
DEPARTMENT OF DEFENSE STANDARDS
MIL-STD-202
- Test Methods, for Electronic and Electrical Component Parts.
MIL-STD-810
- Environmental Test Methods.
MIL-STD-1285
- Marking of Electrical and Electronic Parts.
(Copies of these documents are available online at https://quicksearch.dla.mil or from the Standardization
Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)
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