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MIL-PRF-83726L-002.pdf
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AMSC N/A FSC 5945
MIL-PRF-83726L
24 March 2023
SUPERSEDING
MIL-PRF-83726K
09 June 2022
PERFORMANCE SPECIFICATION
RELAYS, HYBRID AND SOLID STATE, TIME DELAY,
GENERAL SPECIFICATION FOR
This specification is approved for use by all
Departments and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope. This specification establishes the general requirements for time delay relays that are a combination of
hybrid microcircuits, solid state electronics with an integral electromagnetic relay, or solid state output. Relays
covered by this specification are intended for use in aerospace and associated ground support electrical and
electronic systems and equipment (see 6.1). For additional application and caution information see 6.1.
1.2 Classification. Time delay relays covered by this specification are of the following types and classes, as
specified (see 3.1 and 6.10):
Type
I - Time delay on operate.
IIA - Time delay on release (separate control and power terminals).
IIB - Time delay on release (true).
III - Interval timer.
IV - Repeat cycle timer.
V - Time sequence as specified (see 3.1).
Class
A - Hybrid (integral electromagnetic relay qualified to MIL-PRF-39016).
B - Hybrid (integral electromagnetic relay qualified to MIL-PRF-83536).
C - Solid state.
1.2.1 Ratings. Time delay relays with electromechanical relay output and with contact ratings 10 A or greater are
covered in class B.
1.2.2 Part or Identifying Number (PIN). PINs to be used for relays acquired to this specification are created as
follows:
M 83726 /5 -0001 -P W
I I I I I ___I____
M prefix Specification Slash sheet Dash Mounting Quality
designator sheet number number number type when level
applicable
Contact information is as follows:
INCH-POUND
Comments, suggestions or questions on this document should be addressed to DLA Land and Maritime, ATTN:
VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to mailto:relay@dla.mil. Since contact
information can change, you may want to verify the currency of this address information using the ASSIST Online
database at https://assist.dla.mil.
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
Source: https://assist.dla.mil -- Downloaded: 2023-04-18T17:03Z
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MIL-PRF-83726L
2
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 the completeness of this list, document
users are cautioned that they must meet all specified requirements of documents cited in
sections 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 cited in the solicitation or contract.
FEDERAL STANDARDS
FED-STD-H28
- Screw Thread Standards for Federal Services
DEPARTMENT OF DEFENSE SPECIFICATIONS
MIL-PRF-15160/2
- Fuse, Instrument, Power, and Telephone (Nonindicating), Style F02
MIL-PRF-15160/3 - Fuse, Instrument, Power, and Telephone (Nonindicating), Style F03
MIL-PRF-38534 - Hybrid Microcircuits, General Specification for
MIL-PRF-39016 - Relays, Electromagnetic, Established Reliability, General Specification for
MIL-PRF-83536 - Relays, Electromagnetic, Established Reliability, General Specification for
DEPARTMENT OF DEFENSE STANDARDS
MIL-STD-202
- Electronic and Electrical Component Parts
MIL-STD-202-101 - Method 101, Salt Atmosphere (Corrosion)
MIL-STD-202-105 - Method 105, Barometric Pressure (Reduced)
MIL-STD-202-107 - Method 107, Thermal Shock
MIL-STD-202-112 - Method 112, Seal
MIL-STD-202-204 - Method 204, Vibration, High Frequency
MIL-STD-202-208 - Method 208, Solderability
MIL-STD-202-210 - Method 210, Resistance to Soldering Heat
MIL-STD-202-211 - Method 211, Terminal Strength
MIL-STD-202-212 - Method 212, Acceleration
MIL-STD-202-213 - Method 213, Shock (Specified Pulse)
MIL-STD-202-214 - Method 214, Random Vibration
MIL-STD-202-215 - Method 215, Resistance to Solvents
MIL-STD-202-301 - Method 301, Dielectric Withstanding Voltage
MIL-STD-202-302 - Method 302, Insulation Resistance
MIL-STD-202-305 - Method 305, Capacitance
MIL-STD-202-307 - Method 307, Contact Resistance
MIL-STD-202-311 - Method 311, Life, Low Level Switching
MIL-STD-461 - Requirements for the Control of Electromagnetic Interference Characteristics of
Subsystems and Equipment
MIL-STD-704 - Aircraft Electric Power Characteristics
MIL-STD-790 - Established Reliability and High Reliability Qualified Products List (QPL) Systems for
Electrical, Electronic, and Fiber Optic Parts Specifications
MIL-STD-883 - Microcircuits
MIL-STD-1285 - Marking of Electrical and Electronic Parts
(Copies of these documents are available online at https://quicksearch.dla.mil.)
2.3 Non-Government publications. The following documents form a part of this document to the extent specified
herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.
Source: https://assist.dla.mil -- Downloaded: 2023-04-18T17:03Z
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MIL-PRF-83726L
3
AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)
ANSI Y32.2 - Graphic Symbols for Electrical and Electronics Diagrams
(Copies of this document are available from https://www.ansi.org.)
SAE INTERNATIONAL (SAE)
SAE EIA-557 - Statistical Process Control Systems
(Copies of this document are available from https://www.sae.org.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the
text of this document and the references cited herein, the text of this document takes precedence. Nothing in this
document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the
applicable specification sheet. In the event of any conflict between requirements of this specification and the
specification sheet, the latter shall govern.
3.1.1. Level W. The active components supplied within relays and supplied to this level may contain commercial
nonhermetic parts. Time delay relays shall be screened at + 25 ° C and shall have passed seal tests as applicable in
4.7.3.
3.2 Qualification. The relays furnished under this specification shall be a product which has been tested, and has
passed the qualification inspection specified herein, and has been listed on or approved for listing on the applicable
Qualified Products List (QPL).
3.2.1 Qualification and maintenance by similarity. Relays furnished under this specification may be qualified and
maintained by similarity with other relays in the generic family. Manufacturer's which desire to qualify and maintain
products in this same manner shall request this method from the qualifying activity. The manufacturer shall submit
their test plans for the qualifying activity to evaluate. The following is an example of items to be included in the
request, but are not inclusive.
a. Difference between relays.
b. Tests for each relay.
c. Characteristics of each relay such as:
Contact assembly Coil assembly External material
Contact material Coil wire size Case material
Contact size Coil bobbin Plating
Contact configuration Ampere turns Welding process
d. Any other items that may be affected by the differences in design.
3.3 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and externally. Tin
content of relay components and solder shall not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of
3 percent lead, by mass (see
6.4).
The use of lead-free tin alloy high temperature solders (e.g., Au80Sn20, Sn96Ag4, Sn96.5Ag3.5, etc.) for internal
connections may be permitted based upon technical justification and requires approval from the qualifying activity, so
long as the tin content of the relay components and solder does not exceed 97 percent, mass.
Source: https://assist.dla.mil -- Downloaded: 2023-04-18T17:03Z
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MIL-PRF-83726L
4
3.4 Qualification. Relays furnished under this specification shall be products that are authorized by the qualifying
activity for listing on the applicable qualified products list before contract award (see 4.2 and 6.3).
3.5 Qualified Products List (QPL) system. The manufacturer shall establish and maintain a QPL system for parts
covered by this specification. Requirements for this system are specified in MIL-STD-790.
3.5.1 Statistical Process Center (SPC). As part of the overall MIL-STD-790
QPL system, the manufacturer shall
establish an SPC system that meets the requirements of SAE EIA-557.
3.5.2 Electrostatic discharge (ESD) control program. As part of the overall MIL-STD-790 QPL system, the
manufacturer shall establish and maintain an ESD control system. As a minimum, this program shall address the
identification of ESD sensitive (ESDS), sub-components and end items, facilities, training design protection, handling
procedures, marking, cleaning, packaging, and verification. A model ESD control program is available from the
qualifying activity and may be used as a guideline document.
3.6 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a material
shall be used which will enable the relay to meet the performance requirements of this specification. Materials used
shall be fungus inert, self-extinguishing, and shall not support combustion, give off noxious gases in harmful
quantities, give off gases in quantities sufficient to cause explosion of sealed enclosures, cause contamination, or
form current carrying tracks which prevent meeting the post test requirements specified herein. The use of silicone
(see
6.10) or silicone compounds for any purpose other than external gaskets is prohibited. The selection of
materials shall be as such as to provide maximum shelf life. Acceptance or approval of any constituent material shall
not be construed as a guaranty of the acceptance of the finished product.
3.6.1 Metals. Metals shall be of a corrosion-resistant type or shall be plated or treated to resist corrosion. The use
of mercury or mercury compounds is prohibited. The use of magnesium or magnesium alloys is prohibited (not
applicable to contact systems).
3.6.1.1 Plated finishes.
a. Pure tin plating is prohibited internally and externally. Tin-lead finish is acceptable provided that the
minimum lead content is 3 percent. Other tin alloys are acceptable as approved by the qualifying activity.
b. Pure zinc plating is prohibited internally and externally.
c. Pure cadmium plating is prohibited internally and externally.
3.6.1.2 Dissimilar metals. When dissimilar metals are used in intimate contact with each other, protection against
electrolysis and corrosion shall be provided. The use of dissimilar metals in contact, which tends toward active
electrolytic corrosion (particularly brass, copper, or steel used in contact with aluminum or aluminum alloy), is not
acceptable. However, metal spraying or metal plating of dissimilar base metals to provide similar or suitable abutting
surfaces is permitted. Dissimilar metals should be as defined in 6.6. In hermetic seals, the 0.25 volt difference
between the header material and the housing material is not applicable.
3.6.2 Magnet wire. Magnet wire shall be of such quality as to ensure that the relay meets all the performance
requirements of this specification. Additional information and guidance on magnet wire is provided in 6.9.
3.7 Interface and construction requirements. Relays shall meet the interface and construction requirements (weight
or physical dimensions) as specified (see 3.1).
Source: https://assist.dla.mil -- Downloaded: 2023-04-18T17:03Z
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MIL-PRF-83726L
5
3.7.1 Integral electromagnetic relay (class A and class B relays). For hybrid relays covered by this specification,
where the time delay circuitry is external to the integral electromagnetic relay, the integral electromagnetic relay
(mounting means, housing, and terminal styles excepted) shall have been tested and qualified to the following
specifications, as applicable (see
3.1). For hybrid relays covered by this specification, where the time delay circuitry
is contained inside the integral electromagnetic relay, the integral electromagnetic subassembly shall be similar in
design and construction to, and manufactured with essentially the same materials and processes as, a family of
relays that are qualified to the following specifications, as applicable (see 3.1). The integral electromagnetic
subassembly shall be subjected to an unmonitored 3,000 cycle mechanical run-in at room ambient temperature in a
nitrogen atmosphere prior to connection to the time delay circuitry. The cycle rate shall be 600 cycles per minute
±100 cycles per minute.
Class
A - - - - - - - - - - - - - - MIL-PRF-39016
B - - - - - - - - - - - - - - MIL-PRF-83536
3.7.2 Electronic components. All active components shall be hermetically sealed or sealed in a hermetic package.
3.7.3 Case. The case shall be of sufficient mechanical strength to withstand the normal abuse incurred in
handling, transit, storage, and installation without malfunction or distortion of parts.
3.7.3.1 Case grounding. The case shall not be part of the electrical circuit but it may be part of the magnetic
circuit. The case, or permanent attachments thereto, shall provide a means of electrical grounding.
3.7.4 Sealing process. Hermetically sealed (non-potted) relays shall be dried, degassed, and backfilled with an
atmosphere and sealed by welding such that the requirements of this specification are met. Adjunct sealant, (see
6.10), if used, must comply with the following characteristics:
a. Shall not extend above 20 percent of the length of the exposed terminals above the glass meniscus.
b. Trace color is permitted if it is a natural result of the sealant process.
c. Shall form, after curing, a permanent, nonconductive, noncracking seal under all relay environments.
d. Adjunct sealant shall only be applied to relays that have initially passed the gross leak seal requirement of
this specification.
3.7.5 Enclosures.
3.7.5.1 Unsealed enclosure. Unsealed relays shall be totally enclosed for mechanical and dust protection and
shall be explosion-proof. The enclosure design shall be such that pressure differentials cannot exist between the
inside and outside. Metal covers shall be provided with a means for grounding as specified.
3.7.5.2 Hermetically sealed enclosure. Hermetically sealed enclosures shall be dried, degassed, and backfilled
with an atmosphere and sealed such that the requirements of this specification are met.
3.7.5.3 Environmentally sealed (non-hermetic enclosures). Environmentally sealed enclosures shall be
constructed by any means other than that defined under hermetically sealed enclosure (see 3.7.5.2) to achieve the
degree of seal specified (see 3.1).
3.7.5.4 Grounding enclosures. The mounting shall provide an effective electrical contact to ground when the relay
is mounted.
3.7.6 Threaded parts. Unless otherwise specified (see 3.1
), all threaded parts shall be in accordance with
FED-STD-H28. Where practical, all threads shall conform to the coarse thread series. The fine thread series shall
be used only when beneficial to the application.
Source: https://assist.dla.mil -- Downloaded: 2023-04-18T17:03Z
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