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

TECHAMERICA

Statistical Process Control Systems.

(Copies of this document are available from www.techamerica.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 (except for related specification sheets), 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.

3.2 Qualification. Relays furnished under this specification shall be products which are authorized by the

qualifying activity for listing on the applicable qualified products list (QPL) at the time of award of contract (see 4.4

and 6.3).

3.3 Reliability and Statistical process control (SPC).

3.3.1 Reliability. Reliability of relays furnished under this specification shall be established and maintained in

accordance with the requirements and procedures specified in MIL-STD-790 and MIL-STD-690 with details and

exceptions specified in 4.2, 4.4.4, and 4.5.

3.3.2 Statistical process control (SPC). The contractor shall implement and use SPC techniques in the

manufacturing process for parts covered by this specification. The SPC program shall be developed and maintained

in accordance with EIA-557. The SPC program shall be documented and maintained as part of the overall reliability

assurance program as specified in MIL-STD-790.