MIL-PRF-28776 Relays, Hybrid, Established Reliability, General Specification ForThis specification establishes the general requirements for relays that use a combination of solid state circuit input elements functioning with an electro-mechanical relay that performs the switching functions associated with control system applications \(see 6.1\). These relays are designed to operate in low and medium power switching circuits with contact ratings up to 1 ampere alternating current \(ac\) or direct current \(dc\). The failure rate level is established at a confidence level of 90 percent for qualification and 60 percent for maintenance of qualification based on 100,000 cycles at +125┬░C under rated load conditions specified herein. Excludes time delay relays. CAUTION: The use of any coil voltage less than the rated coil voltage will compromise the operation of the relay. CAUTION: Pick-up, hold, and dropout voltages are for test purposes only and are not to be used as design criteria. For additional application and caution information, see 6.1.

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MIL-PRF-28776F

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order

(see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel

need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are

maintained by the Inventory Control Point's packaging activities within the Military Service or Defense Agency, or

within the military service's system commands. Packaging data retrieval is available from the managing Military

Department's or Defense Agency's automated packaging files, CD-ROM products, or by contacting the responsible

packaging activity.

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Intended use. Relays conforming to this specification are intended for use in electronic and communication

equipment. Their principal areas of application are for aircraft, missiles, spacecraft and ground-support electronic

and communication equipment.

CAUTION: The use of any coil voltage less than the rated coil voltage will compromise the operation of the

relay.

6.1.1 Contact rating. The contact ratings of relays covered by this specification are based on load endurance tests

which establish the relay capability to switch rated loads. For the purposes of this specification, contact load ratings

are defined as follows:

Low level: 10 �A at 50 mV to 10 mA at 6 V.

Intermediate: 10 mA at 6 V to 100 mA at 28 V.

High level: Above 100 mA at 28 V.

6.1.2 Failure rate level. Failure rate level (percent per 10,000 cycles) as specified in table I, is based on an

average of 10 cycles per hour, per application, for 1,000 hours in accordance with MIL-STD-690.

6.2 Acquisition requirements. Acquisition documents must specify the following:

Title, number, and date of the specification.

If required, the specific issue of individual documents referenced (see 2.1).

Packaging requirements (see 5.1).

Marking requirements for failure rate level (see 3.28 and MIL-STD-690).

6.2.1 Manufacturer provided services. The manufacturer may provide the following optional value added services

when specified in the purchase order:

Hot solder dipping of terminals (see 3.5.7).

Shortening of wire leads (see 3.5.7.2).