Recycled, recovered, or environmentally preferable materials

Page Title: Recycled, recovered, or environmentally preferable materials
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MIL-O-52374D

3.2 First article. Unless otherwise specified in the contract or purchase order, samples shall be

subjected to first article inspection (see 4.2 and 6.4).

3.3 Materials and components. Materials and components shall be as specified herein. Materials and

components not specified shall be selected by the contractor and shall be subject to all provisions of this

specification.

3.3.1 Insulating material. The interior circuitry of the oscillator shall be encapsulated in sealing

compound conforming to MIL-PRF-23586.

3.3.2 Housing material. Housing material shall be copper-flashed steel and shall be nickel plated in

accordance with type III, class 1 of SAE-AMS-QQ-N-290.

3.3.3 Components.

3.3.3.1 Resistors. Resistors shall conform to MIL-PRF-39017 or equivalent resistors which meet the

requirements of this specification.

3.3.3.2 Capacitors. Tantalum capacitors shall conform to MIL-PRF-39003. Ceramic capacitors shall

3.3.3.3 Semiconductors. Transistors and diodes shall conform to MIL-PRF-19500.

3.3.3.4 Transformers. Transformers shall conform to MIL-PRF-27.

3.3.4 Lead materials and finishes. Lead or terminal material and finishes shall be used that enables

the oscillator to meet all of the requirements of this specification. For further guidance on lead finishes

(see 6.5.)

3.3.5 Metals All metals used in the construction of the oscillators covered by this specification shall be

corrosion resistant or protectively treated to resist corrosion in consonance with the performance

requirements specified herein. When dissimilar metals are used in contact with each other, protection

against electrolysis and corrosion shall be provided. Metal plating or metal spraying of dissimilar base

metals to provide similar or suitable abutting surfaces is permitted. Dissimilar metals are defined in MIL-

3.3.6 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or

environmentally preferable materials should be used to the maximum extent possible, provided that the

material meets or exceeds the operational and maintenance requirements, and promotes economically

advantageous life cycle costs.

3.4 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally and

externally. Tin content of (product) and solder shall not exceed 97 percent, by mass. Tin shall be alloyed

with a minimum of 3 percent lead, by mass (see 6.5).

3.5 Dimensions and weight.

3.5.1 Dimensions. Dimensions shall be as shown on figure 1 and as specified herein.

3.5.2 Weight. The oscillator shall not exceed 1.75 ounces total weight.

3.6 Burn-in. Each oscillator shall be operated with an input of 6.75 V dc for 100 hours.

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